Table Of Contents
Installing the Cisco ONS 15454-FAP-LVD2 Fuse Alarm Panel
Safety Information
Product Description
Fuse Alarm Panel Components
Packaged Hardware
Mounting
LED Indicators
TPA Fuses
Power Buses
Input/Output Voltage and LVD
Input Power Connections
Output Power Connections
OR-ing Diodes
Ground Connections
Alarm Operation and Connections
Cooling
Specifications
Pre-Installation
General Installation Recommendations
Unpacking and Inspection
Installation Tools Required
Materials Required
Installation
General Precautions
Test Continuity
Test Input BATT to Input RTN
Test Alarm Terminals
Mount Fuse Alarm Panel on Rack
Check/Adjust Mounting Brackets
Fasten Fuse Alarm Panel on Rack
Install Fuse Alarm Panel Wiring
Install Ground Wires
Connect Alarms
Connect Output
Connect Input
Install Protective Covers
Testing
Test Power Indicators and Connection Polarity
Test Alarm Contacts Normal State
Test Failed Fuse Alarm
Operation
Install TPA Fuse
Connect New Equipment
Adjust Low Voltage Disconnect
24 VDC Operation
Maintenance
Routine Inspection
Replace Failed TPA Fuse
Replace Bus Module
Allowable Ampacities of Insulated Conductors
Related Documentation
Obtaining Optical Networking Information
Where to Find Safety and Warning Information
Cisco Optical Networking Product Documentation CD-ROM
Obtaining Documentation and Submitting a Service Request
Installing the Cisco ONS 15454-FAP-LVD2 Fuse Alarm Panel
Product Number: 15454-FAP-LVD2=
This document explains how to install, test, operate, and maintain the Cisco ONS 15454-FAP-LVD2 fuse alarm panel with a low voltage disconnect (LVD) function.
The following sections are included in this document:
•
Safety Information
•Product Description
•Pre-Installation
•Installation
•Testing
•Operation
•Maintenance
•Allowable Ampacities of Insulated Conductors
•Related Documentation
•Obtaining Optical Networking Information
•Obtaining Documentation and Submitting a Service Request
Safety Information
Before you install, test, operate, and maintain the Cisco ONS 15454-FAP-LVD2 fuse alarm panel, you must read the Regulatory Compliance and Safety Information for Cisco Optical Transport Products document for important safety information and warning translations.
The Cisco ONS 15454-FAP-LVD2 fuse alarm panel is compliant with the warning statements 345, 1001, 1005, 1017, 1018, 1028, 1047, and 1064.
Product Description
The Cisco 15454-FAP-LVD2 fuse alarm panel supplies low-voltage, protected DC power to the -48 VDC powered equipment installed in a central office, multimedia headend, remote site, or other restricted access locations. The fuse alarm panel provides the following basic functions and features:
•Two side-by-side modules, designated A and B, each providing two power buses with two power outputs per bus. The four buses are labeled A1, A2, B1, and B2.
•Eight Transmit Power Amplifier (TPA) fuse holder receptacles (two per bus) providing mounting positions for eight fuses.
•Maximum input rating of 75 Amps per bus and 50 Amps per fuse. This corresponds to a maximum input rating of 150 Amps per each dual-bus module and 300 Amps per the total four-bus panel.
•Field-adjustable LVD function with individual settings for each power bus. The LVD device cuts off power if the bus voltage drops below a user-defined disconnect setting and reconnects power if the bus voltage rises to a user-defined recovery setting. LVD on each bus is set to a default disconnect setting of -39 VDC +/-0.5 VDC and default recovery setting of -43.5 VDC +/-0.5 VDC. The disconnect and recovery setting can each be field-adjusted.
•OR-ing diodes on each positive input to a power bus. These diodes provide isolation of the return paths for all bus circuits.
•Mounting brackets provide the ability to mount the fuse alarm panel in a 23-inch (584.2 mm) WECO equipment rack. The fuse alarm panel occupies 1 rack space (2 inches, 50.8 mm).
•Two-hole compression-lug style terminals for input power connections.
•Screw-down barrier terminal strips for output power connections.
•Wire-wrap pin terminals for alarm connections. Either an open fuse or loss of power initiates relay operation which opens one set of relay contacts (form C) and closes another set. The alarm contacts can be used to open or close a loop connected to an external alarm system.
•Four Power indicators (green) and four LVD Alarm indicators (red).
•Individual Fuse Alarm (red) indicators on each TPA fuse holder. These alarms indicate when the corresponding fuse has failed.
•Two chassis ground studs. These studs ensure reliable ground connectivity from the fuse alarm panel to office ground.
•Easy to remove or replace plastic protective covers. These covers mount over the input and output terminal connections to prevent inadvertent contact with power.
The following topics are included:
•Fuse Alarm Panel Components
•Packaged Hardware
•Mounting
•LED Indicators
•TPA Fuses
•Power Buses
•Input/Output Voltage and LVD
•Input Power Connections
•Output Power Connections
•OR-ing Diodes
•Ground Connections
•Alarm Operation and Connections
•Cooling
•Specifications
Fuse Alarm Panel Components
The Cisco 15454-FAP-LVD2 fuse alarm panel consists of two side-by-side modules, designated A and B. The two modules are mirror images of one another. Each module provides two power buses and holds four TPA fuses. In total, the fuse alarm panel provides four buses with eight TPA fuses per panel. (See Figure 1.)
The fuse alarm panel components are either mounted on or housed within a powder-painted, sheet metal (cold rolled steel) enclosure. As shown in Figure 1:
•TPA fuse holders, TPA fuses, power indicators, and LVD alarm indicators are mounted on the front side of the fuse alarm panel. Each fuse holder also has an individual Fuse Alarm indicator to indicate if the fuse in that fuse holder has failed.
Figure 1 Fuse Alarm Panel Components
•Power input and output terminals, alarm terminals, and ground studs are mounted on the rear side of the fuse alarm panel.
•The plastic protective covers install over the input and output power terminals. The covers prevent accidental contact with the terminals when power is present in the fuse alarm panel.
The internal bus wiring, alarm relay circuit boards, LVD devices, and OR-ing diodes are mounted within the enclosure and are not user-accessible.
Packaged Hardware
The shipped product includes hardware components that are packaged separately and shipped in the carton with the basic fuse alarm panel. The packaged hardware components are shown in Figure 2 and include the following items:
•5/16-inch long, Phillips drive, 8-32 flat-head screws (10 which includes 2 spares)—Used to secure the mounting brackets to the fuse alarm panel.
•3/8-inch long, combination drive, 12-24 pan-head screws (4) and #12 flat washers (4)—Used to secure the panel mounting brackets to the equipment rack.
•#10 ring terminals (2) for 12-10 AWG wire—Can be used to connect the grounding cables to the grounding studs.
•Rear protective input terminal covers (4) and output terminal covers (4)—Used to prevent accidental contact with the power input and output terminals.
•Designation card and card holder (2)—Used to record information about the fused equipment. Cards and clear cover insert into the card holder.
•Designation window and designation strips—Used to record information about the input and output cable connections. Window and strip press onto holder on rear side of fuse alarm panel.
Figure 2 Packaged Hardware Provided With 15454-FAP-LVD2 Fuse Alarm Panel
Mounting
The 15454-FAP-LVD2 is shipped with mounting brackets configured for flush mounting in a 23-inch (584.2 mm) rack.
If desired, the mounting brackets can be removed and reinstalled for flush mounting or for a recess of 1 inch or 5 inches (0.0, 25.4 mm, or 127 mm).
The fuse alarm panel requires one open rack space or equivalent spacing above and below the chassis for heat dissipation.
LED Indicators
Four Power indicators (green) are provided on the front side of the fuse alarm panel, one indicator for each power bus (A1, A2, B1, and B2). These indicators stay on (green) as long as electrical power is present in the corresponding power bus. The POWER indicator turns off if the power to the corresponding power bus is interrupted.
Four LVD Alarm indicators (red) are also provided on the front side of the fuse alarm panel, one indicator for each power bus. These indicator turns on (red) when the LVD device for the corresponding power bus disconnects the load from the power bus due to a low voltage condition, which occurs when the input voltage is equal to or less than the LVD disconnect setting. When the voltage level returns to the LVD recovery setting or greater, the indicator turns off.
Note The LVD on each power bus is set to a disconnect setting of -39 VDC and recovery setting of -43.5 VDC. The disconnect setting and recovery setting can each be field-adjusted.
Separate Fuse Alarm (red) indicators are provided on each fuse holder. The Fuse Alarm indicator turns on when the corresponding fuse fails. Replacement of the failed fuse with a good fuse will turn off the Fuse Alarm indicator.
TPA Fuses
The fuse alarm panel uses TPA fuses, which can range in size from 3-50 Amps, but two fuses on the same bus cannot together total more than 75 Amps. The fuses install in fuse holders that insert into any one of the eight receptacles located on the front side of the fuse alarm panel. Each receptacle provides one fuse holder mounting position. Each power bus is fed through two fuse positions.
Power Buses
The fuse alarm panel has four power bus (power feed) circuits: A1 and A2 within the A module; B1 and B2 within the B module. The circuit block diagram is as shown in Figure 3. (Module A is shown, but module B is analogous.) As shown, in each bus circuit, current flows from the input power terminals through the corresponding fuses to the output power terminals (labeled A1, A2, B1, or B2).
The maximum current capacity of each power bus circuit is 75 Amps. The total output current capacity of any one fuse on each bus must not exceed a 50 Amp rated fuse. The maximum current rating is marked on the fuse alarm panel rear side.
When a TPA fuse fails, the input power bus is disconnected from the corresponding output circuit. A fuse failure also causes the Fuse Alarm indicator on the front of the corresponding fuse holder to light (red) and opens/closes a set of alarm relay contacts.
Figure 3 Module Schematic (Module A Shown)
Input/Output Voltage and LVD
The 15454-FAP-LVD2 fuse alarm panel accepts an input voltage of -48 VDC nominal, within an input range from -30 VDC to -60 VDC.
The LVD function protects the batteries by disconnecting the load if the voltage on any bus drops below a set level called the LVD disconnect setting. The disconnect setting for all buses are set by default at -39 VDC (+/- 0.5 VDC). The disconnect setting is field-adjustable.
The LVD function also provides a separate recovery setting for each bus. This is the trigger point at which the LVD reconnects the load when voltage supply on the bus has returned to a safe level. The recovery setting for all buses are set by default to -43.5 VDC (+/- 0.5 VDC). The recovery setting is field-adjustable.
LVD adjustments are made using DIP switches. See the "Adjust Low Voltage Disconnect" procedure for LVD adjustments.
Input Power Connections
Input power is supplied to the fuse alarm panel through the A1, A2, B1, and B2 input power terminal blocks, located on the rear side of the fuse alarm panel. Each input terminal block includes two pairs of 0.25-inch studs that are used for connecting the BATT negative (-) and RTN positive (+) input power cables. Each pair of studs is mounted on 0.625 inch centers and accepts various sizes of 2-hole compression lugs and AWG wire. The maximum lug width is 0.62 inches. In selecting the copper wire size to be used for power input, consider the allowable ampacity as defined by local practice and the National Electrical Code (see Table 2) or the wire size mentioned in the ONS system chassis requirement, whichever higher.
Output Power Connections
Output power is supplied to the protected equipment through the A1, A2, B1, and B2 output power terminal blocks, located on the rear side of the fuse alarm panel.The screw-down terminals are used for connecting the BATT negative (-) and RTN positive (+) output power wiring to the equipment.
Each terminal block consists of four pairs of screw down terminals equipped with 8-32 screws. The output power wires can be terminated with spade-type compression lugs (maximum width 0.378 inches), or the insulation can be stripped back and the bare wire looped under the screw head. In selecting the copper wire size to be used for power output, consider the allowable ampacity as defined by local practice and the National Electrical Code (see Table 2).
OR-ing Diodes
The fuse alarm panel is equipped with OR-ing diodes that are installed on the RTN positive (+) inputs to the four buses. The purpose of these OR-ing diodes is to provide isolation of the return paths of the bus circuits. In a situation where two of the bus circuits are combined together at the equipment, this prevents both batteries from being drained if one battery is shorted. The isolated good battery continues to function, providing uninterrupted power. For a circuit diagram, see Figure 3.
Ground Connections
Two #10 studs are provided on the rear side of the fuse alarm panel for attaching a grounding cable to the fuse alarm panel chassis. The grounding studs are mounted on 0.625 inch centers. A minimum #6 AWG copper wire terminated with a 2-hole compression lug is recommended for use as the grounding cable and is provided with the fuse alarm panel.
Alarm Operation and Connections
The 15454-FAP-LVD2 has circuitry that opens and closes form C relay contacts when a fuse fails or when power to any one of the four power buses is lost. These relay contacts can be used to open or close a loop circuit connected to an external alarm system.
The physical interface to the relays is through two blocks of wire wrap pins (one for each module) on the rear side of the fuse alarm panel. Each block has three rows of three pins labeled NO, C, and NC. The top row is used for Bus 1 failure, the middle row is used for Bus 2 failure, and the bottom row is not used.
During normal operation (when power is present), the normally open (NO) contacts remain open and the normally closed (NC) contacts remain closed. When a fuse fails, or when source power to a power bus is lost, or when an LVD device disconnects the power, the NO contacts close and the NC contacts open, creating a connection between the NO and common (C) terminals and an open circuit between the NC and C terminals.
The wire wrap pins accept #22 to #24 AWG copper wire. The rating for the alarm relay contacts is 110 VDC (125 VAC maximum voltage) with 1.0 Amp maximum switching current.
Cooling
For cooling, the fuse alarm panel relies on convection air flow. Holes are provided on the top and bottom of the fuse alarm panel to allow heated air to escape and cool air to enter. At least one rack unit of space or equivalent spacing must be provided above and below the fuse alarm panel to allow for air circulation.
Specifications
The fuse alarm panel has the following specifications:
•Physical
–Weight:23.62 lbs. (10.71 kg)
–Dimensions (HxWxD): 1.98 x 21.1 x 10.3 inches (50.3 x 536 x 262 mm)
–Color: blue
–Rack mounting: 23-inch (EIA or WECO hole spacing)
•Electrical
–Operating voltage: -48 VDC nominal (input range: -30 VDC to -60 VDC)
–LVD disconnect setting (disconnect trigger): -39 VDC (adjustable)
–LVD recovery setting (reconnect trigger): -43.5 VDC (adjustable)
–Input current: 75 Amps per bus maximum (150 Amps per each dual-bus module)
–Fuse type: TPA
–Fuse mounting positions: 2 per bus (8 total)
–Maximum fuse size: 50 Amps rating
–Input terminal type: 2-hole compression lug (0.25 inch holes on 0.625 inch centers); maximum lug width 0.620 inches
–Output terminal type: screw-down barrier terminal strip; 8-32, maximum lug width 0.378 inches
–Alarm contact voltage: 110 VAC, 125 VDC maximum
–Alarm contact current: 1 Amp maximum
–Grounding connection: 2 #10 studs on 0.625 centers (ground wires are terminated at the ground studs using #10 ring terminals or 2-hole compression lug)
•Environmental
–Operating temperature: -5º C to +55º C
–Storage temperature: -45º C to +85º C
–Humidity range: 0% to 95% humidity (no condensation)
–Altitude range: up to 13,000 ft. (3.96 km)
–Fire rating: all components UL94-V0 or better
–Acoustic noise: 0 dBA above ambient
•Torque
–Mounting bracket chassis screws: 15 pound force-inches (1.7 Newton meters)
–Mounting bracket rack screws: 27 pound force-inches (3.1 Newton meters)
–Input power terminal nuts: 42 pound force-inches (4.75 Newton meters)
–Output power terminal nuts: 15 pound force-inches (1.7 Newton meters)
–Grounding stud nuts: 20 pound force-inches (2.3 Newton meters)
•Compliance
–UL, NEC 2002, NEBS Level 3, IEC, and CE
Figure 4 shows fuse alarm panel dimensions.
Figure 4 15454-FAP-LVD2 Dimensions
Pre-Installation
This section provides general installation recommendations and unpacking and inspection procedures for the Cisco ONS 15454-FAP-LVD2. This section also lists the tools and materials required for fuse alarm panel installation.
The following topics are included:
•General Installation Recommendations
•Unpacking and Inspection
•Installation Tools Required
•Materials Required
General Installation Recommendations
The Cisco 15454-FAP-LVD2 should be installed in a central office, equipment cabinet, or other restricted access location. Mount the fuse alarm panel in the uppermost area of the rack to reduce the exposure of the power wiring. At least one rack unit of space must be provided above and below the fuse alarm panel to allow for air circulation.
Route ground, power input, power output, and alarm cables to the fuse alarm panel according to local practice and procedures. After routing the cables, secure them to the equipment rack or to any cable management devices that are in use. Follow the instructions provided in this manual when connecting the cables to the fuse alarm panel. Install the protective covers on the rear side of the fuse alarm panel after all wiring connections are made and all tests are completed. Do not apply power to the fuse alarm panel until all wiring and tests are completed.
Warning The unit might have more than one power supply. All connections must be removed to de-energize the unit. Statement 1028
Unpacking and Inspection
Before starting the installation, always open the shipping boxes and verify that all parts have been received and that no shipping damage has occurred. Check the fuse alarm panel for broken or missing parts. If there is any damage, contact the Cisco Technical Assistance Center (TAC). See the "Obtaining Documentation and Submitting a Service Request" section for contact information.
Installation Tools Required
The following tools are required to install the fuse alarm panel:
•Phillips screwdrivers (#1 and #2)
•Flat-blade screwdrivers (medium and large)
•Torque wrench calibrated in pound-force inches or Newton meters
•3/8-inch and 7/16-inch sockets (for torque wrench)
•Wire cutter
•Wire stripper
•Compression lug crimper
•Wire-wrap tool
•Multimeter
•Heat gun
Materials Required
The following materials are required to install the fuse alarm panel:
•Insulated copper wire for input and output power wires (see Appendix A)
•2-hole compression lugs for terminating #6 AWG input wires or #6 AWG grounding wires (0.625 inches between centers)
•#6 copper wire for ground connections
•#22 to #24 AWG insulated copper wire for the wire-wrap pin terminal alarm wires.
•Heat-shrink tubing
Installation
This section describes how to install the Cisco ONS 15454-FAP-LVD2. Installation includes continuity testing, rack mounting, and wiring.
The following topics are included:
•General Precautions
•Test Continuity
•Mount Fuse Alarm Panel on Rack
•Install Fuse Alarm Panel Wiring
General Precautions
Warning To prevent the system from overheating, do not operate it in an area that exceeds the maximum recommended ambient temperature of 55º C. Statement 1047
Warning Suitable for mounting on concrete or other non-combustible surface only. Statement 345
Warning Take care when connecting units to the supply circuit so that wiring is not overloaded. Statement 1018
Warning This equipment is intended to be grounded to comply with emissions, immunity, and safety requirements.
Warning This unit is intended for installation in restricted access areas. A restricted access area can be accessed only through the use of a special tool, lock and key, or other means of security. Statement 1017
Warning This product relies on the building's installation for short-circuit (overcurrent) protection. Ensure that the protective device is rated not greater than 150 Amps per module. Statement 1005
Caution
Care should be given to allow sufficient air circulation or space between units when the fuse alarm panel is installed in a closed or multi-unit rack assembly because the operating ambient temperature of the rack environment might be greater than room ambient.
Note The DC mains positive terminal must be connected to ground at the source.
Test Continuity
This procedure describes how to verify that the internal circuitry of the fuse alarm panel has not been damaged during shipping and handling.
Step 1 Complete the "Test Input BATT to Input RTN" task.
Step 2 Complete the "Test Power Indicators and Connection Polarity" task.
Step 3 Continue with the "Mount Fuse Alarm Panel on Rack" procedure.
Stop. You have completed this procedure.
Test Input BATT to Input RTN
This task checks that there is no short between the input negative terminal and the input positive terminal on each bus circuit.
Step 1 Beginning at bus A1, connect one test probe to the BATT input power terminal and the other test probe to the RTN input power terminal (Figure 5).
Figure 5 Testing Input BATT to Input RTN
Step 2 Verify that no continuity exists between the input power BATT and RTN terminals. Reverse the test probe connections and re-verify that no continuity exists between the input power RTN and BATT terminals.
Step 3 Repeat the test procedure for each remaining bus (A2, B1, and B2).
Step 4 Return to the "Test Continuity" procedure.
Test Alarm Terminals
This task checks that the alarm relays are functioning correctly for each of the bus modules (A and B).
Note This procedure tests the alarm indicator contacts as they should be with no power being supplied to the fuse alarm panel. In this state, the normally open (NO) contacts should be closed and the Normally Closed (NC) contacts should be closed. When power is supplied to the fuse alarm panel, the states of the contacts will be as marked on the fuse alarm panel (NO will be open, NC will be closed).
Step 1 Starting at the module A alarm terminals on the right rear side of the fuse alarm panel, connect the test probes between the C and NC terminals on the first set of alarm terminals, labeled FAIL A1(Figure 6).
Figure 6 Testing Alarm Terminals
Step 2 Verify that no continuity exists between the C and NC terminals.
Step 3 Connect the test probes between the C and NO terminals on the first set of alarm terminals.
Step 4 Verify that continuity exists between the C and NO terminals.
Step 5 Repeat test procedure for each set of alarm terminals (FAIL A2).
Step 6 Repeat the same test for module B alarm terminals (FAIL B1, FAIL B2) on the left rear side of the chassis.
Step 7 Return to the "Test Continuity" procedure.
Mount Fuse Alarm Panel on Rack
Warning This unit is intended for installation in restricted access areas. A restricted access area can be accessed only through the use of a special tool, lock and key, or other means of security. Statement 1017
This procedure describes how to install the fuse alarm panel on the rack and perform related tasks such as installing the cable management bar.
Step 1 Complete the "Check/Adjust Mounting Brackets" task.
Step 2 Complete the "Fasten Fuse Alarm Panel on Rack" task.
Step 3 Continue with the "Install Fuse Alarm Panel Wiring" procedure.
Stop. You have completed this procedure.
Check/Adjust Mounting Brackets
This task checks the mounting brackets on the fuse alarm panel to determine whether the default configuration is correct for the planned application. If not, this task removes and reinstalls the mounting brackets in the correct configuration.
Caution
When attaching the mounting brackets to the fuse alarm panel, use only the 5/16-inch (7.94 mm) long flathead screws provided with the fuse alarm panel. Use of any other hardware could cause contact with internal parts of the fuse alarm panel.
Step 1 Determine whether the fuse alarm panel will be mounted as shipped in the flush position.
Step 2 If a flush mounting or recess of 1 inch or 5 inches is desired, remove the mounting brackets and re-install them in the desired position (Figure 7).
Figure 7 Installing Mounting Brackets on Fuse Alarm Panel Chassis
Step 3 Attach the brackets to the side of the fuse alarm panel chassis using the eight 5/16-inch (7.94 mm) long Phillips-driven, 8-32 flathead screws provided with fuse alarm panel.
Step 4 Tighten the screws to 15 pound force-inches (1.7 Newton meters) of torque to insure grounding.
Step 5 Return to the "Mount Fuse Alarm Panel on Rack" procedure.
Fasten Fuse Alarm Panel on Rack
This task installs the fuse alarm panel on the rack.
Note Provide one rack unit of space or equivalent spacing above and below the fuse alarm panel for air circulation.
Step 1 Align the fuse alarm panel with the rack in a top position of the rack (Figure 8).
Figure 8 Fastening the Fuse Alarm Panel to the Rack
Step 2 Fasten the fuse alarm panel to the rack using the four 3/8-inch (9.53 mm) long, Phillips-drive, 12-24 pan head screws and four #12 flat washers provided with the fuse alarm panel.
Step 3 Tighten the screws to 27 pound force-inches (3.1 Newton meters) of torque to insure grounding.
Step 4 Return to the "Mount Fuse Alarm Panel on Rack" procedure.
Install Fuse Alarm Panel Wiring
This procedure describes how to wire the fuse alarm panel for operation.
Caution
All DC input wiring shall be routed away from any sharp edges and properly secured in place to prevent chaffing and to provide strain relief. This may be achieved by tie-wrapping the wires to the rack frame, or by equivalent means.
Step 1 Complete the "Install Ground Wires" task.
Step 2 Complete the "Connect Alarms" task.
Step 3 Complete the "Connect Output" task.
Step 4 Complete the "Connect Input" task.
Step 5 Complete the "Install Protective Covers" task.
Step 6 Continue with the "Test Power Indicators and Connection Polarity" procedure.
Stop. You have completed this procedure.
Install Ground Wires
This task grounds the fuse alarm panel chassis to office ground.
Step 1 Obtain a length of minimum # 6 AWG wire for use as the chassis grounding wire.
Step 2 Terminate one end of the wire with a 2-hole compression lug.
Step 3 Locate the C. GND (chassis ground) studs at the rear of the fuse alarm panel (Figure 9).
Figure 9 Installing Ground Wires
Step 4 Place the lug over the studs and secure using the kep nuts and washers provided (requires 3/8-inch socket). Tighten each stud nut to 20 pound-force inches (2.3 Newton meters) of torque.
Step 5 Route the free end of the chassis grounding wire to an approved office ground source. Terminate the wire at the ground source.
Step 6 Return to the "Install Fuse Alarm Panel Wiring" procedure.
Connect Alarms
This task connects an external alarm system to the alarm terminals on the fuse alarm panel chassis.
Caution
All DC input wiring shall be routed away from any sharp edges and properly secured in place to prevent chaffing and to provide strain relief. This may be achieved by tie-wrapping the wires to the rack frame, or by equivalent means.
Step 1 Obtain #22 to #24 AWG wire.
Step 2 Cut the wire into the number of pieces required, each of a length based on the distance from the fuse alarm panel to the external alarm system.
Step 3 Strip back the insulation approximately 1.5 inches (38.1 mm) on each piece of wire.
Step 4 Using the wire wrap tool, connect the individual pieces to the respective terminals.
Note Normally open (NO) and normally closed (NC) alarm contacts are provided for connecting the fuse alarm panel to an external alarm system. Alarm connections are provided through wire-wrap pins located on the rear side of the fuse alarm panel (Figure 10). Two blocks of terminals (one per module) are provided for reporting power fail LVD action and fuse fail alarms combined. The wire-wrap terminals can accept #22 to #24 AWG solid copper wire. The rating for the alarm relay contacts is 110 VDC (125 VAC maximum voltage) with 1.0 Amp maximum switching current
Figure 10 Connecting Alarms
Step 5 Route the wires to the external alarm system.
Step 6 Terminate the wires at the appropriate terminals in the external alarm system.
Step 7 Return to the "Install Fuse Alarm Panel Wiring" procedure.
Connect Output
This task connects the fuse alarm panel to the protected equipment.
Caution
All DC input wiring shall be routed away from any sharp edges and properly secured in place to prevent chaffing and to provide strain relief. This may be achieved by tie-wrapping the wires to the rack frame, or by equivalent means.
Caution
Connecting the equipment to the wrong circuit may cause damage to the equipment or the fuse alarm panel. Make sure the fuse is the correct type and current rating as specified by the equipment manufacturer.
Note The continuous output load of the equipment during normal operation should not exceed 80% of the rated value of the fuse. This allows some room for manufacturing tolerances and voltage fluctuations in the plant power mains.
Step 1 Obtain the required lengths of wire for use as the output power cables.
Output power is supplied to the fused equipment through the output power terminal blocks, equipped with 8-32 screws. The output power wires may be terminated with spade-type compression lugs (maximum width 0.378 inches), or the insulation may be stripped back and the bare wire looped under the screw head. Follow local code. In selecting wire size, refer to Table 2 for ampacity guidelines.
Step 2 Equip wire leads with ring-type compression lugs (maximum width 0.378 inches) or prepare a bare wire contact.
Step 3 Terminate the wires at the screw-down barrier strip as follows:
•Negative wires (Battery -): Connect to the BATT output power terminals.
•Positive wires (Return +): Connect to RTN output power terminals.
Figure 11 shows a connection using ring-type compression lugs.
Figure 11 Connecting Output Power
Step 4 Tighten the output power terminal block nuts to 15 pound-inches (1.7 Newton-meters) of torque.
Step 5 Route the free end of each output power cable to the equipment for connection.
Step 6 Return to the "Install Fuse Alarm Panel Wiring" procedure.
Connect Input
This task connects the fuse alarm panel to the input power source.
Caution
All DC input wiring shall be routed away from any sharp edges and properly secured in place to prevent chaffing and to provide strain relief. This may be achieved by tie-wrapping the wires to the rack frame, or by equivalent means.
Caution
Connect only the input voltage wire (the wire labeled BATTERY or BATT, or labeled with the negative (-) voltage polarity and/or the voltage value) to the connector on the fuse alarm panel labeled BATT. Connect only the input return wire (the wire labeled RTN, RETURN, or BATTERY GROUND, or labeled with the positive (+) voltage polarity) to the connector on the fuse alarm panel labeled RTN.
Caution
Caution should be taken to not reverse the input wires to the fuse alarm panel. Within the fuse alarm panel, the internal return wiring is not protected by fuses. If the wires are reversed, current flows through the unprotected return wiring in the fuse alarm panel to the equipment. This condition can cause damage to the equipment in the frame in which the fuse alarm panel is installed and to equipment in adjacent frames.
Step 1 Obtain eight lengths of copper wire for use as the input power cables.
Input power is supplied to the fuse alarm panel through the A1, A2, B1, and B2 input power terminal blocks located on the rear side of the fuse alarm panel. Each input terminal block consists of two pairs of 0.25-inch studs that are used for connecting the negative (BATT) and positive (RTN) input power cables. The stud pairs are mounted on 0.625 inch centers and accept 2-hole compression lugs. The maximum lug width is 0.62 inches. Kep nuts are provided to secure the compression lugs to the terminal block.
In selecting wire size, follow local code. Refer to Table 2 for ampacity guidelines
Step 2 Strip back 7/8 inches of insulation from one end of each wire.
Step 3 Slide a 2-inch length of heat shrink insulation over the end of each wire.
Step 4 Terminate one end of each wire with the 2-hole lug terminals provided (requires crimper).
Step 5 Slide the heat shrink insulation down to the lug terminal so the barrel end of the terminal is covered.
Step 6 Use a heat gun to apply heat to the heat shrink insulation until it tightens around the wire and barrel end of the terminal.
Step 7 Form each input cable into the shape required for connection to the input terminals and secure to side of rack.
Step 8 Use the kep nuts provided to secure the input power wires to the specified terminals (Figure 12).
Figure 12 Connecting Output Power
Step 9 Connect the negative inputs to the negative (BATT) terminals on the A1, A2, B1, and B2 input power terminal blocks.
Step 10 Connect the positive inputs to the positive (RTN) terminals on the A1, A2, B1, and B2 input power terminal blocks.
Step 11 Use a torque wrench (with a 7/16-inch socket) to tighten the input power terminal block nuts to 42 pound-force inches (4.75 Newton meters) of torque.
Step 12 Route the free ends of the input power cables to the office battery source.
Step 13 Connect the input power cables to the office battery power source in accordance with applicable local electrical codes and/or National Electrical Codes. Do not apply power to the fuse alarm panel until instructed to do so for testing (see Testing).
Step 14 Return to the "Install Fuse Alarm Panel Wiring" procedure.
Install Protective Covers
This task installs the protective covers on the input and output power terminals.
Step 1 Align the protective covers with the input and output terminals (Figure 13).
Figure 13 Installing Protective Covers
Step 2 Snap the covers into position.
Step 3 Return to the "Install Fuse Alarm Panel Wiring" procedure.
Testing
This section describes how to test the Cisco ONS 15454-FAP-LVD2 after installation.
The following topics are included:
•Test Power Indicators and Connection Polarity
•Test Alarm Contacts Normal State
•Test Failed Fuse Alarm
Test Power Indicators and Connection Polarity
Perform the following procedure to verify that the power LEDs indicate receipt of power and that the input power cables are connected for correct polarity:
Step 1 Verify that any fuses installed during pre-installation testing have been removed, and then turn on the power supply (all four sources) to the fuse alarm panel.
Step 2 Verify that the Power indicators for all circuits are switched on.
Step 3 Verify that the input power cables are connected to the correct terminals.
Step 4 Use a multimeter (set to measure DC voltage) to measure the voltage between each input power RTN terminal and chassis ground. The voltage level should be less than 2.0 VDC.
Step 5 If the voltage is more than 2.0 VDC, perform the following to verify and reduce the voltage level to less than 2.0 VDC:
a. Check the voltage between the power terminal and chassis ground.
b. Turn off the power supply from the panel and reverse the input power wires. Turn on the power supply and again measure the voltage between each RTN input power terminal and the chassis ground.
Stop. You have completed this procedure.
Test Alarm Contacts Normal State
The following procedure describes how to test the alarm connections for correct functioning of the NO and NC terminals.
Step 1 Verify that the alarm contacts remain in the normal state when power is applied and no fuse alarms are present.
Step 2 Using a multimeter that is set to test for continuity, connect the probes alternately between the C and NC terminals and the C and NO terminals for all sets of alarm terminals.
Step 3 Verify that continuity exists between the C and NC terminals and that no continuity exists between the C and NO terminals.
Stop. You have completed this procedure.
Test Failed Fuse Alarm
The following procedure describes how to test correct functioning of the failed fuse alarms:
Step 1 Remove the TPA fuse holder from bus A1.
Step 2 Install a failed TPA fuse into the fuse holder.
Step 3 Re-install the fuse holder (with the failed TPA fuse) in the fuse alarm panel.
Step 4 Verify that the red Fuse Alarm indicator on the fuse holder is switched on (is lit red).
Step 5 Locate the alarm terminals labeled A1 FAIL at the rear side of the fuse alarm panel.
Step 6 Connect the probes alternately between the C and NC terminals and the C and NO terminals.
Step 7 Use a multimeter (set to test continuity) between the C and NO terminals and that no continuity exists between the C and NC terminals.
Step 8 Remove the TPA fuse holder (with the failed TPA fuse) from bus A1 and re-install a good fuse.
Step 9 Repeat steps 1 through 8 for the remaining buses (A2, B1, and B2). Verify that the red Fuse Alarm indicator on the fuse holder goes on as the failed fuse is installed in the fuse alarm panel. In addition, locate the appropriate FAIL (A1, B1, B2) terminals on the rear side of the fuse alarm panel. Use a multimeter (set to test continuity) to verify that continuity exists between the C and NO terminals and that no continuity exists between the C and NC terminals.
Step 10 When testing is complete, make sure the failed fuse used for testing is removed and replaced with good fuses in all the tested positions.
Stop. You have completed this procedure.
Operation
This section describes how to operate the Cisco ONS 15454-FAP-LVD2 fuse alarm panel.
The following topics are included:
•Install TPA Fuse
•Connect New Equipment
•Adjust Low Voltage Disconnect
Install TPA Fuse
This procedure describes how to install a TPA fuse.
Caution
Using the wrong fuse can cause damage to the protected equipment or the power distribution panel. When replacing a blown fuse, make sure the fuse-type and current rating of the replacement fuse complies with any recommendations provided by the manufacturer of the protected equipment and does not exceed 50 Amps
. Also, make sure that the two fuses installed for any bus do not total more than 75 Amps. The fuse rating must be chosen according to the protected equipment requirements.
Note The continuous output load of the equipment during normal operation should not exceed 80% of the rated value of the fuse. This allows some room for manufacturing tolerances and voltage fluctuations in the plant power mains.
Step 1 Obtain a TPA fuse of the recommended size and type (as specified by the equipment manufacturer) in each fuse position as needed. The current rating of the fuse (in Amps) is indicated on the fuse.
Step 2 Remove the fuse holder from the fuse alarm panel by pulling outward on the fuse holder handle until it comes free of the fuse alarm panel.
Step 3 Insert the TPA fuse into the two clips on the top side of the fuse holder as shown in Figure 14. Note that the plastic ring around the center part of the fuse fits into a recess provided in the top of the fuse holder.
Figure 14 Inserting Fuse Into Fuse Holder
Step 4 Insert the fuse holder (with installed TPA fuse) into the fuse alarm panel (Figure 15). Press firmly to make sure the fuse holder is fully seated.
Figure 15 Inserting Fuse Holder Into Fuse Alarm Panel
Step 5 Verify that the Fuse Alarm indicator on the front of the fuse holder stays off.
Step 6 Use a multimeter (set to measure DC voltage) to verify that the output voltage at the equipment is a nominal -48 VDC and that the polarity of the negative and positive wires is correct.
Stop. You have completed this procedure.
Connect New Equipment
This procedure describes how to connect new equipment to the fuse alarm panel.
Note The continuous output load of the equipment during normal operation should not exceed 80% of the rated value of the fuse. This allows some room for manufacturing tolerances and voltage fluctuations in the plant power mains.
Step 1 Remove the plastic protective cover from the rear side of the output power terminal block.
Step 2 Locate the output power terminals and verify that a fuse is not installed in the corresponding fuse mounting position.
Step 3 Connect the output power wiring to the power output terminals. In selecting wire size, follow the local code referring to the ampacity guidelines provided in Table 2.
Caution
Take care to avoid shorting out adjacent terminals when connecting new output power wiring to a powered fuse alarm panel. Shorting can cause injury and damage the fuse alarm panel or the connected equipment.
Step 4 Re-install the plastic protective covers over the output power terminal block.
Step 5 Install a fuse of the recommended size (as specified by the equipment manufacturer) in the appropriate fuse position.
Stop. You have completed this procedure.
Adjust Low Voltage Disconnect
Low Voltage Disconnect (LVD) is a function performed by the fuse alarm panel to prevent damage to batteries by shutting down (disconnecting) the equipment when the voltage drops below a specific level, and turning the power supply on (recovery) when the voltage returns to a specific level. Both the disconnect level voltage and recovery voltages are adjustable. The LVD fuse alarm panel ships with the following default voltage settings:
•Voltage: -48 VDC
•Disconnect voltage: -39 VDC
•Recovery voltage: -43.5 VDC
To change the default voltage settings, perform the following:
Step 1 On the module that you want to adjust, remove the LVD cover. Remove the two screws as shown in Figure 16. This allows access to adjustment switches as shown in the Figure 17.
Step 2 Set switches to the required levels as shown in Table 1.
Note If the LED recovery voltage is set equal to or less than the LVD disconnect value, the Power LED flashes and the system overrides the recovery setting and sets the recovery to 1 VDC greater than the disconnect value. The power LED continues to flash as long as the switch settings remain set in this manner.
Figure 16 Removing LVD Cover
Figure 17 LVD Adjustment Area
Table 1 LVD Threshold and Recovery Settings
|
Low Voltage Recovery
|
Low Voltage Disconnect
|
|
Left DIP Switch Settings
|
48 VLVR
(VDC)
|
|
Right DIP Switch Settings
|
48 VLVD
(VDC)
|
|
|
1
|
2
|
3
|
4
|
1
|
2
|
3
|
4
|
0 |
0 |
0 |
0 |
-39.5 |
-16.0 |
0 |
0 |
0 |
0 |
-38.0 |
-15.5 |
0 |
0 |
0 |
1 |
-40.0 |
-16.5 |
0 |
0 |
0 |
1 |
-38.5 |
-16.0 |
0 |
0 |
1 |
0 |
-40.5 |
-17.0 |
0 |
0 |
1 |
0 |
-39.5 |
-16.5 |
0 |
0 |
1 |
1 |
-41.0 |
-17.5 |
0 |
0 |
1 |
1 |
-40.0 |
-17.0 |
0 |
1 |
0 |
0 |
-41.5 |
-18.0 |
0 |
1 |
0 |
0 |
-40.5 |
-17.5 |
0 |
1 |
0 |
1 |
-42.0 |
-18.5 |
0 |
1 |
0 |
1 |
-41.0 |
-18.0 |
0 |
1 |
1 |
0 |
-42.5 |
-19.0 |
0 |
1 |
1 |
0 |
-41.5 |
-18.5 |
0 |
1 |
1 |
1 |
-43.0 |
-19.5 |
0 |
1 |
1 |
1 |
-42.0 |
-19.0 |
1 |
0 |
0 |
0 |
-43.5 |
-20.0 |
1 |
0 |
0 |
0 |
-42.5 |
-19.5 |
1 |
0 |
0 |
1 |
-44.0 |
-20.5 |
1 |
0 |
0 |
1 |
-43.0 |
-20.0 |
1 |
0 |
1 |
0 |
-44.5 |
-21.0 |
1 |
0 |
1 |
0 |
-43.5 |
-20.5 |
1 |
0 |
1 |
1 |
-45.0 |
-21.5 |
1 |
0 |
1 |
1 |
-44.0 |
-21.0 |
1 |
1 |
0 |
0 |
-45.5 |
-22.0 |
1 |
1 |
0 |
0 |
-44.5 |
-21.5 |
1 |
1 |
0 |
1 |
-46.0 |
-22.5 |
1 |
1 |
0 |
1 |
-45.0 |
-22.0 |
1 |
1 |
1 |
0 |
-46.5 |
-23.0 |
1 |
1 |
1 |
0 |
-45.5 |
-22.5 |
1 |
1 |
1 |
1 |
-47.0 |
-23.5 |
1 |
1 |
1 |
1 |
-46.0 |
-23.0 |
Step 3 When complete, reinstall the LVD cover.
Stop. You have completed this procedure.
24 VDC Operation
The LVD unit can be set to operate at 24 VDC. To switch the module from -48 VDC to -24 VDC nominal input, remove the module from the chassis and move the DIP switch as shown in Figure 18. The power LED turns to yellow during normal operation.
Figure 18 Setting 24 VDC Operation
Maintenance
This section provides routine maintenance procedures for the Cisco ONS 15454-FAP-LVD2.
The following topics are included:
•Routine Inspection
•Replace Failed TPA Fuse
•Replace Bus Module
Routine Inspection
This procedure describes how to perform a routine inspection.
Caution
Take care to avoid damaging the fuses or wiring.
Step 1 Inspect the fuse alarm panel for damage to the fuse holders and for damaged or broken wires at the power and external alarm connections.
Step 2 If excessive dirt is found during the inspection, brush or wipe dust and dirt from the fuse alarm panel with a soft bristle brush or soft cloth.
Step 3 If any fuse holder is broken or damaged, replace the fuse holder.
Stop. You have completed this procedure.
Replace Failed TPA Fuse
This procedure describes how to replace a failed TPA fuse.
Note When a TPA fuse fails, the fuse alarm indicator on the corresponding fuse holder lights (red) and the fuse alarm contacts for the corresponding power bus switch to the alarm state.
Step 1 Remove the fuse holder from the fuse alarm panel.
Note The fuse alarm contacts should return to the normal state. Determine the problem that caused the fuse to fail and take the appropriate corrective action. When the problem has been corrected, install a replacement TPA fuse in the fuse holder.
Step 2 Using a medium size screwdriver, carefully pull the failed fuse out of the fuse holder.
Step 3 Install the replacement fuse in the fuse holder and insert the fuse holder into the fuse alarm panel (see Figure 14).
Caution
Make sure the fuse-type and current rating of the replacement fuse comply with the recommendations of the equipment manufacturer and do not exceed 50 Amps. For any bus, both fuses together cannot exceed 75 Amps.
Note The continuos output load of the equipment during normal operation should not exceed 80% of the rated value of the fuse.
Stop. You have completed this procedure.
Replace Bus Module
This procedure describes how to replace a module.
Note When replacing a module, all wires must be disconnected.
Step 1 Turn off the power supply to the module.
Warning This unit might have more than one power supply connection. All connections must be removed to de-energize the unit. Statement 1028
Step 2 Disconnect the alarm wires for the module being replaced.
Step 3 Disconnect all wires from the input and output terminals.
Step 4 Remove the four screws on the front and four screws on the back (shown exploded from the bus module in Figure 19).
Figure 19 Removing the Bus Module That is Being Replaced
Step 5 Slide out the module from the fuse alarm panel chassis, as shown in Figure 19.
Step 6 Slide in the new module and fasten it in the chassis using the same eight screws.
Step 7 Connect the output power wires first, and then the input power wires.
Step 8 Turn on the power supply to the new module.
Stop. You have completed this procedure.
Allowable Ampacities of Insulated Conductors
This section provides guidelines for selecting AWG wire size based on the temperature rating of the conductor and the anticipated load. The information contained is from Table 2 of the National Electrical Code document, ANSI/NPFA 70 (1978).
Note Information for aluminum conductors has been omitted from the table because copper conductors only are recommended for use with the 15454-FAP-LVD2 fuse alarm panel.
Table 2 Allowable Ampacities of Insulated Conductors, Rated O Through 2000 Volts, 60× to 90×C (140× to 194×F), Not More Than Three Current-Carrying Conductors in Raceway or Cable or Earth (Directly Buried), Based on Ambient Temperature of 30×C (86×F)
|
Size
|
Temperature Rating of Conductor
|
|
AWG
kcmil
|
60
×C
(114
×F)
|
75
×C
(167
×F)
|
90
×C
(194
×F)
|
| |
TYPES
TW*,
UF*
|
TYPES
FEPW*,
RH*, RHW*,
THHW*,
THW*,
THWN*,
XHHW*,
USE*, ZW*
|
TYPES
TBS, SA,
SIS, FEP*,
FEPB*, MI,
RHH*, RHW-2,
THHN*,
THHW*, THW-2*,
THWN-2*,
USE-2,
XHH,
XHHW*
XHHW-2
ZW-2
|
|
18
|
.... |
.... |
14 |
|
16
|
.... |
.... |
18 |
|
14
|
20* |
20* |
25* |
|
12
|
25* |
25* |
30* |
|
10
|
30 |
35* |
40* |
|
8
|
40 |
50 |
55 |
|
6
|
55 |
65 |
75 |
|
4
|
70 |
85 |
95 |
|
3
|
85 |
100 |
110 |
|
2
|
95 |
115 |
130 |
|
1
|
110 |
130 |
150 |
|
1/0
|
125 |
150 |
170 |
|
2/0
|
145 |
175 |
195 |
|
3/0
|
165 |
200 |
225 |
|
4/0
|
195 |
230 |
260 |
|
250
|
215 |
255 |
290 |
|
300
|
240 |
285 |
320 |
|
350
|
260 |
310 |
350 |
|
400
|
280 |
335 |
380 |
|
500
|
320 |
380 |
430 |
|
600
|
355 |
420 |
475 |
|
700
|
385 |
460 |
520 |
|
750
|
400 |
335 |
380 |
|
800
|
410 |
490 |
555 |
|
900
|
435 |
520 |
585 |
|
1000
|
455 |
545 |
615 |
|
1250
|
495 |
590 |
665 |
|
1500
|
520 |
625 |
705 |
|
1750
|
545 |
650 |
735 |
|
2000
|
560 |
665 |
750 |
|
CORRECTION FACTORS
For ambient temperatures other than 30C (86F), multiply
the allowable ampacities by the appropriate factor shown below.
|
|
21-25
|
1.08 |
1.05 |
1.04 |
|
26-30
|
1.00 |
1.00 |
1.00 |
|
31-35
|
.91 |
.94 |
.96 |
|
36-40
|
.82 |
.88 |
.91 |
|
41-45
|
.71 |
.82 |
.87 |
|
46-50
|
.58 |
.75 |
.82 |
|
51-55
|
.41 |
.67 |
.76 |
|
56-60
|
.... |
.58 |
.71 |
|
61-70
|
.... |
.33 |
.58 |
|
71-80
|
.... |
.... |
.41 |
* Unless otherwise specifically permitted in the code, as defined in the NEC document cited (ANSI/NEC 70), the overcurrent protection for conductor types marked with an asterisk (*) shall not exceed 15 amperes for No. 14, 20 amperes for No. 12, and 30 amperes for No. 10 copper, after any correction factors for ambient temperature (see and number of conductors have been applied.
Related Documentation
Use the Installing the Cisco ONS 15454-FAP-LVD2 spare document in conjunction with the following referenced publications as needed:
•Unpacking and Installing the Cisco ONS 15216 Five-Component Bay Assembly
•Cisco ONS 15454 Procedure Guide
•Cisco ONS 15454 Reference Manual
•Cisco ONS 15454 Troubleshooting Guide
Obtaining Optical Networking Information
This section contains information that is specific to optical networking products. For information that pertains to all of Cisco, refer to the Obtaining Documentation and Submitting a Service Request section.
Where to Find Safety and Warning Information
For safety and warning information, refer to the Cisco Optical Transport Products Safety and Compliance Information document that accompanied the product. This publication describes the international agency compliance and safety information for the Cisco ONS 15xxx system. It also includes translations of the safety warnings that appear in the ONS 15xxx system documentation.
Cisco Optical Networking Product Documentation CD-ROM
Optical networking-related documentation, including Cisco ONS 15xxx product documentation, is available in a CD-ROM package that ships with your product. The Optical Networking Product Documentation CD-ROM is updated periodically and may be more current than printed documentation.
Obtaining Documentation and Submitting a Service Request
For information on obtaining documentation, submitting a service request, and gathering additional information, see the monthly What's New in Cisco Product Documentation, which also lists all new and revised Cisco technical documentation, at:
http://www.cisco.com/en/US/docs/general/whatsnew/whatsnew.html
Subscribe to the What's New in Cisco Product Documentation as a Really Simple Syndication (RSS) feed and set content to be delivered directly to your desktop using a reader application. The RSS feeds are a free service and Cisco currently supports RSS version 2.0.
This document is to be used in conjunction with the documents listed in the "Related Documentation" section.
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