GE Industrial Solutions LP11 924 Series 6 & 10 kVA - Manual (Page 29)

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OPM_LPU_11U_6K0_10K_1US_V010.Doc 28 User manual LP11 924 6 & 10 kVA UPS 1.0
Procedure b: isolation and removal of a unit (‘UPS #’) from the parallel system:
1. A manual transfer to the bypass supply may be required. Ensure that on each unit of the system:
- the circuit breaker ‘bypass on/off’ (9 in figure 19) is in position 'on'
- the LCD screen shows the default screen
- the LCD screen does not show any alarm concerning bypass availability.
2. Turn the manual bypass switch of all units into position '2'.
3. Switch off UPS # with the on/off switch.
Switches (utility, static bypass, on/off) of the remaining UPSs in the parallel system should remain in the “on” position.
4. Remove the installation fuse from the input of UPS # (F1-4 in figure 17).
5. Separate the output of UPS # from the output junction (S1-4 in figure 17).
6. Disconnect all wiring from the UPS, including the network cable(s).
7. The unit is now fully disconnected from the parallel system, it may be removed.
Have maintenance work performed by qualified service personnel only.
To re-enter UPS # into the system:
1. Reinstall the I/O power cables and network cables.
2. Reinstall the input fuse F #.
3. Close switch S # to connect the output of UPS # to the output junction.
4. Turn switch ‘UPS on/off’ into position ‘on’.
5. Turn the manual bypass switches of all units back into position ‘1’.