The Maintenance Of Ups And Options; Service Procedures Of Power Module, Bypass Module And Output Distribution Module; Service Procedures Of Power Module - Emerson Liebert APM 90 User Manual

10.3 The Maintenance Of UPS And Options

UPS and the options need common maintenance:
1. Keep good history record. Keeping good history record facilitates failure treatment.
2. Keep clean, so as to prevent UPS from the invasion of dust and moisture.
3. Maintain appropriate ambient temperature. The most appropriate temperature for battery is 20°C to 25°C.
Too low temperature will reduce the battery capacity and too high temperature will reduce the battery life.
4. Check the wiring; Check the tightening of all connected screws, and there should be routine tightening at
least once a year.
5. Check regularly if there is any abnormity in the superior or subordinate switch to ensure cutting off the
import or export when the current is too large.
Maintenance staff should be familiar with the typical ambient conditions where UPS is working in order to
rapidly position which ambient conditions are unusual; the setting of UPS operation control panel should be
known as well.
For UPS Battery Maintenance, refer to 6.11 Battery Maintenance.
10.4 Service Procedures Of Power Module, Bypass Module And Output
Distribution Module
Only customer commissioning engineers shall service the power modules and bypass module.

10.4.1 Service Procedures Of Power Module

Provided that the UPS is in normal mode, and that the bypass is normal:
1. If the available UPS power modules have redundancy, proceed to step 2; if not, 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 (that is, in unready state),
at this time, the green indicator beside the ready switch is off.
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.
The module will be blocked by a spring piece on 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, check that the address of this module is different from those of other modules
and that the address is in the range from 1 to 12. Check 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 minutes, place the ready switch of the module to the down position, and the module will
connect to the system.
Liebert APM 90 Integrated Modular UPS User Manual
Chapter 10 Service And Maintenance
Warning
Note
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