Emerson Liebert APS Installation Manual download pdf (Page 43)

Chapter 5 Service 35

Liebert APM Modular UPS User & Installation Manual

Chapter 5 Service

This chapter introduces the UPS service, including the service procedures of the power module, bypass module and

output distribution module, and the replacement of air filter.

5.1 Replacement Procedures Of Power Module, Bypass Module And Output

Distribution Module

5.1.1 Notes

1. Only the customer service engineers shall service the power modules, bypass module and output distribution

modules.

2. Remove the power modules, bypass module and output distribution modules from top to bottom, so as to prevent

cabinet toppling due to high centre of gravity .

3. To ensure safety, before servicing the power modules and bypass module, be sure to use a multimeter to verify

that the DC bus capacitor voltage is lower than 60Vdc, and that the voltages between the earth and the components

you are going to work on are under dangerous voltage values, that is, lower than 60Vdc or 42.4Vac peak value.

4. The static bypass module is not hot pluggable. It should be replaced only when the UPS is in maintenance bypass

mode or completely powered off.

5. The power modules and bypass module should be serviced five minutes, and installed in the cabinet again 10

minutes, after they are removed.

5.1.2 Power Module Replacement Procedures

Provided that the UPS is in normal mode, and that the bypass is normal:

1. Press and hold the INVERTER OFF key on the operator control and display panel for two seconds to manually turn

off the inverters, and the UPS transfers to bypass mode.

2. Place the ready switch on the front panel of the power module to the up position (i.e., in unready state).

3. Two minutes later, remove the fixing screws on both sides of the front panel of the module, and pull the module out

of the cabinet.

Note: The module will be blocked by a spring piece at the left side of the module when the module is pulled out of the

cabinet halfway. At this point, you must press the spring piece before you continue to pull the module out.

4. After servicing the module, confirm that the DIP switch of the module is set correctly, and that the ready switch is in

unready state.

5. Push the module (at least 10s after another) into the cabinet, and tighten the screws on both sides.

6. Wait for two seconds, place the ready switch of the module to the down position, and the module is ready. Then the

module will be added into the system automatically and begin to work.

5.1.3 Power Module Service Procedures

Provided that the UPS is in normal mode, and that the bypass is normal:

1. Press and hold the INVERTER OFF key on the operator control and display panel for two seconds to manually turn

off the inverters, and the UPS transfers to bypass mode.

2. Close the maintenance bypass, and the UPS transfers to maintenance bypass mode.

3. Open the UPS output switch and input switch.

4. Press the EPO switch, and open the battery circuit breaker (BCB).

5. Remove the fixing screws on both sides of the front panel of the bypass module, and pull the module out of the

cabinet.

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Emerson Liebert APS Installation Manual Page 43