Vertiv EXM 0080kTK16FN01000, User Manual

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Chapter 10 Service And Maintenance 131
Liebert EXM 80kVA ~ 200kVA UPS User Manual
Chapter 10 Service And Maintenance
The UPS system (including battery) needs regular service and maintenance in long-term operation. This
chapter elaborates on the advice on the service life, regular inspection, maintenance and replacement of
the UPS key components. Effective maintenance of the UPS system can reduce the risk in UPS failure and
prolong the UPS service life.
10.1 Safety
Warning
1. Inspection of UPS systems can only be executed by people who have received relevant training, and the
inspection and replacement of devices should only be undertaken by authorized professionals.
2. The components that can only be accessed by opening the protective cover with tools cannot be operated by
the user. Only qualified service personnel are authorized to remove such covers.
3. Note that the neutral line has hazardous voltage when servicing the UPS.
10.2 Service Procedures Of Power Module And Bypass Module
10.2.1 Notes
1. Only 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. 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.
10.2.2 Service Procedures Of Power Module
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 switch, and the UPS transfers to maintenance mode.
3. Place the ready switch on the front panel of the power module to the up position (that is, in unready
state).
4. Disconnect the UPS input switch and output switch. In split bypass configuration, it is required to
disconnect both input switches.
5. Ensure that the battery current is less than 2A. Open the BCB or disconnect the batteries
6. 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.