Emerson manual User Instructions Issue AB, March 22 Spec. No Model 710NPBA

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

SM-DU+ and Shunt Interface Assembly 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)Carefully label the wires connected to the shunt input terminal blocks on circuit card. These wires must be connected to the same terminals on the replacement circuit card. Refer to Figure 4-12.

5)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 4-12.

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.

6)Remove the external wiring from the shunt input terminal blocks. 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.

7)Unplug all connectors plugged into the circuit card.

8)Remove the screw securing the SM-DU+ and Shunt Interface Assembly to the bottom of the distribution cabinet, and remove the assembly.

9)SM-DU+:In this step, ensure you do not intermix the old and replacement circuit cards. Set the switches on the replacement circuit card to the same settings as the old circuit card. Switch settings are documented in CHAPTER 3. SETTING JUMPERS AND SWITCH OPTIONS of the Power System Installation Instructions (IM581127000).

10)Slide the replacement SM-DU+ and Shunt Interface Assembly into the mounting position inside the distribution cabinet, and secure with the screw removed from the old assembly.

11)Plug all connectors removed from the old circuit card into the same position on the replacement circuit card.

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

12)Reconnect the external wiring to the correct terminals on the shunt input terminal blocks. First remove the electrical tape that was applied to the bare wire end in a previous step. DO NOT allow the bare wire end to contact any grounded or energized object. After securing the wire, gently tug on the wire to ensure that it

Page 36 Chapter 4. Troubleshooting and Repair

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