Emerson MPR15 Series, MPR25 Fan failure, Fan replacement procedure DANGER, Load sharing, Step

76 Maintenance

Load sharing

Verify that the sense leads of all the rectifiers are connected to a common point (across the battery or output power terminals of the power shelf, or at the discharge busbar).

Readjust the rectifier’s float voltage until all the rectifiers share the load. It is recommended that the current from each rectifier be 3 amperes minimum for best results.

It is also recommended to leave the units functioning for at least 30 minutes to reach full stability, prior to final system adjustment.

Fan failure

Fan failure is indicated by the absence of fan rotation. The rectifier will be inhibited and an RFA and Fan alarm will be activated. The Fan Fail LED will turn RED.

Fan replacement procedure

DANGER

Before replacing the fan, turn the rectifier off. Remove the rectifier from the shelf. Wait five minutes to allow all internal capacitors to fully discharge.

CAUTION

Take the necessary precautions to prevent any dirt, dust, moisture, or metallic particles from falling into the unit.

Procedure 21 - Fan replacement

Step Action

1With the unit sitting solidly on a clean workbench, carefully remove the five mounting screws that secure the fan assembly (see Figure 27).

2Slowly and carefully remove the fan assembly by pulling it from the chassis.

3Take note of which side the wire is connected to the fan and disconnect the fan connector (three pins).

continued

UM5C06B / C ( 169-2071-500 ) P0711722 Standard 10.00 May 2001