Cisco VCO/4K Open Programmable Switches

Document ID: 15282

Contents

Introduction
Prerequisites
      Requirements
      Components Used
      Conventions
Changing Power Feeds
      Preparation
      Changing Power Feeds
Related Information

Introduction

This document outlines the steps required to change the power configuration on a VCO/4K.

Prerequisites

Requirements

There are no specific requirements for this document.

Components Used

This document is not restricted to specific software and hardware versions.

Conventions

Refer to Cisco Technical Tips Conventions for more information on document conventions.

Changing Power Feeds

This section explains the preparation and procedure required in changing power feeds.

Preparation

If a VCO is changing from AC to DC or DC to AC, some preparation work needs to be completed before making any changes to the VCO. First, new power supplies need to be ordered for the VCO. Second, a licensed electrician needs to drop new power feeds to the VCO cabinet.

Changing Power Feeds

5/16 and a 7/16 inch nut drivers and a #2 Phillips head screwdriver will be needed to install the new power. In order to change the power feeds, follow the steps below.

1. Turn the power off at the back of the VCO and the power supply panel.

2. Use a #2 Phillips head screwdriver to remove the two screws holding the PEM safety cover and remove the safety cover.

3. Using a multimeter, verify that the power supply leads connected to the VCO are dead.

4. Using the 7/16 inch nut driver, loosen and remove the connected power leads from the VCO.

5. Using the 5/16 inch nut driver, loosen the nuts that hold the power leads under the strain reliefs and remove the cables from the VCO.

6. Feed the new power supply leads under the strain reliefs and strip 1/2 inch of insulation off each of the new power leads. Crimp the 2 hole copper lugs to each new feed.

   • For single feed DC power, install the jumpers between the returns and the battery terminals. The jumper should go between TB1 -> TB4, and TB2 -> TB5. Then connect the return lead to TB4 and the battery lead to TB5. Connect the ground to TB3.

   • For dual feed DC power, connect the A-battery to TB2 and the B-battery to TB5. Connect the A-return to TB1 and the B-return to TB4. Connect the ground to TB3.

   • For AC power, connect line 1 to TB2 and connect line 2 to TB5. Connect the ground to TB3.

   Caution: If the VCO is being converted from a single feed DC power to any other configuration, the jumpers on TB1 -> TB4 and TB2 -> TB5 must be removed. The power entry module should also be physically removed to check for the presence of an internal jumper on the printed circuit board located on the right hand side of the power entry module. Failure to check for this internal jumper could result in permanent damage to the equipment.

7. Secure the cables into the tie wrap mounts below each terminal using the nylon ties supplied in the VCO/4K PEM kit. Slip a tie through the slots in each mount, wrap the tie around the cable, slide the tie through its lock, tighten and cut off the excess.

8. Each TB lug should be tightened between 45 and 61 in.-lb.

9. Tighten down the strain reliefs.

10. Replace the power supply modules located at the bottom front of the VCO with the new power supply modules that correspond with the new power.

11. With the VCO power switch in the Off position, turn the power on at the power panel only. Using a multimeter, check to make sure the voltages are correct and that the leads are connected to the correct TB terminals.

12. If the voltages are OK, then replace the Power Entry Module cover.

13. Flip the VCO power switch to the On position.

Related Information

• Voice Technology Support
• Voice and Unified Communications Product Support
• Recommended Reading: Troubleshooting Cisco IP Telephony
• Technical Support - Cisco Systems