48 Chapter 7 Service
NXr UPS Module And Parallel System 30kVA ~ 200kVA User Manual
Chapter 7
Service
This chapter introduces the UPS service, including the service procedures of the power module and bypass modules,
and the replacement procedures of the air filters.
Warning: hazardous mains and/or battery voltage present behind protective cover
1. The components that can only be accessed by opening the protective cover with tools cannot be operated by user. Only
qualified service personnel are authorised to remove such covers.
2. In UPS maintenance, note that the neutral line is energized.
7.1 Service Procedures Of Power Module And Bypass Module
7.1.1 Notes
1. Only the customer service engineers shall service the power modules and bypass module.
2. Remove the power modules and bypass module from top to bottom, so as to prevent cabinet toppling due to high
gravity center.
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 bypass module is not swappable. Only when the UPS is transferred to internal or external maintenance
bypass or completely powered off can the bypass module be removed.
5. The power modules and bypass module should be serviced 10 minutes after they are removed.
7.1.2 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 button 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).
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 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 one to five (one to six for 200kVA UPS). 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. If the UPS has been transferred to bypass, press and hold the INVERTER ON button for two seconds to start
up all power modules.
7.1.3 Service Procedures Of Bypass Module
Provided that the UPS is in normal mode, and that the bypass is normal:
Summary of Contents for Liebert NXr
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