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Smart Tower UPS 10-30KVA User Manual
Chapter 7 Maintenance
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Chapter 7 Maintenance
This chapter introduces UPS maintenance, including the maintenance instructions of power module,
monitor, bypass module and the change method of dust filter.
7.1 Instruction of Maintenance Operation
7.1.1 Precautions
1. Only qualified trained engineers can do this job.
2. The principle is the broken components should be disassembled from top to bottom, so as to
prevent any inclination from high gravity centre of the cabinet.
3. To ensure the safety, before power modules and bypass modules maintenance, it is a must use
multi-meter to measure the DC bus capacitor voltage and ensure the voltage is below 60, and use a
multi-meter to measure the voltage between operating parts and the earth to ensure the voltage is
lower than hazardous voltage, i.e. DC voltage is lower than 60Vdc, and AC maximum Voltage is
lower than 42.4Vac.
4. Only after 10 minutes removed the power components and bypass components off can the
maintenance be carried out.
7.1.2 Instruction to Bypass Module
Suppose UPS is running in normal mode, and the bypass is normal:
1. Select LCD touch screen manual switch of bypass, the UPS power will be supplied by bypass.
2. The rotary circuit breaker is switched to the maintenance bypass in order that the load power supply is
supplied by the maintenance bypass.
3. Open UPS main switch and bypass switch.
4. Open external battery switch.
5. Take the door sheet of UPS off and remove and repair the damage components,
6. Reinstall the corresponding components in the cabinet after maintenance, reinstall the internal door
sheet, and complete connection of the flat cables at the front end of the internal door.
7. Close the bypass switch Q2, and switch the rotary switch to “UPS output” after 10 seconds.
After 5S minutes, the indicator light of the operating control display panel works, which shows the power
is normally supply by the bypass.
8. Close mains input switch, the inverter automatically starts, and UPS operates in the normal mode after
60 seconds.
9. Open external battery switch or internal battery switch, the battery light on the panel stop operation,
which show connection with the battery; inspect the battery voltage shown on the panel.
10. Re-install the anti-operate baffle of maintenance bypass.