Emerson 710NPBA Circuit Card Replacement Procedures, Issue AB, March 22 Spec. No Model 710 Npba

UM581127000	User Instructions
Issue AB, March 22, 2012	Spec. No. 581127000 (Model 710NPBA)

Circuit Card Replacement Procedures

Warning: Circuit cards used in this power system contain static-sensitive devices. Read the Static Warning at the front of this document before performing any of the following procedures.

General

The following circuit card replacement procedures can be performed with the system operating.

Refer to Figure 2-1for circuit card locations.

Caution: When performing any step in these procedures that requires removal or installation of hardware, use caution to ensure no hardware is dropped and left inside the cabinet; otherwise service interruption or equipment damage may occur.

Note: When performing any step in these procedures that requires removal of existing hardware, retain all hardware for use in subsequent steps.

System Interface Circuit Card Replacement

Procedure

1)Performing this procedure may activate external alarms. Do one of the following. If possible, disable these alarms. If these alarms cannot be easily disabled, notify the appropriate personnel to disregard any future alarms associated with this system while the procedure is being performed.

Danger: Performing the next steps exposes service personnel to battery potential. Exercise extreme caution not to inadvertently contact or have any tool inadvertently contact any energized electrical termination.

2)Open the distribution cabinet’s front door by turning the latch in the counterclockwise position.

Warning: Damage to the circuit card may result if the next step is not followed.

3)Connect an approved grounding strap to your wrist. Attach the other end to a suitable ground.

4)Remove the top and front panels to access the circuit cards at the bottom of the distribution cabinet.

5)Carefully label any wires connected to the customer connection terminal block on the circuit card. These wires must be connected to the same terminals on the replacement circuit card. Refer to Figure 4-9.

6)Carefully label the connectors plugged into the circuit card. These connectors must be plugged into the same connectors on the replacement circuit card. Refer to Figure 4-9.

Danger: In the next step, external wiring may be energized from an external source. DO NOT allow bare wire ends to contact any grounded or energized object.

7)Remove the external wiring from the customer connection terminal block. DO NOT allow the bare wire end to contact any grounded or energized object. Isolate the wire end with electrical tape. Repeat for each wire to be removed.

8)Unplug all connectors plugged into the circuit card.

Page 30 Chapter 4. Troubleshooting and Repair

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