FAULT REPAIR PROCEDURES

9.2 Fan Unit Fault

START

Set the PWR SW key on the PZ-M369 to the ON position.

When the fan spins

Set PWR SW key to AUTO position, and short the thermal relay of the thermal unit.

If the fan does not

 

Check the connector cable between

 

operate

 

the FANU and the thermal unit.

 

If the fan operates

 

Replace thermal relay with a spare.

 

 

 

 

 

 

Disconnect

the

fan

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

connector of the cable for

 

 

 

 

 

the thermal unit.

 

 

 

 

 

 

Replace thermal relay with

 

 

 

 

 

 

 

 

 

 

a spare.

 

 

Connect the fan connector.

If the fan does not operate

Check the voltage (DC -48 V) at connectors FC0 through FC2.

If the voltage is less

 

Check the connector cable (fan con-

 

than -48 V

 

nector) between the FANU and the

 

 

PIM.

If the voltage is -48 V

 

Replace the fan with a spare. Refer to

 

 

 

Section 4., Fan Unit Replacement, in

 

 

Chapter 4.

After the fault is corrected, set PWR SW key to the AUTO position. If the fans are to continue operating constantly, set PWR SW key to the ON position.

END

NDA-24300CHAPTER 5

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Issue 1

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NEC NDA-24300 manual Fan Unit Fault, Pim, If the voltage is -48