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34001813EN/AE - Page 52
4. Maintenance
If the load is supplied by the UPS with Bypass AC source present:
Parallel UPS configuration without external bypass cabinet
Shutdown and isolation of the first UPS unit:
Shutdown and isolation of the second UPS unit:
1 - Press a button to exit sleep mode.
2 - Shut down the UPS by pressing the OFF button (38) for 3 seconds.
3 - Set bypass switch Q3BP (10) to ON.
4 - Set output switch Q5N (11) to OFF.
5 - Set the battery circuit-breaker QF1 (13) (or set the battery circuit-
breakers of the auxiliary cabinets if any) to OFF.
6 - Set the input circuit-breaker Q1 (8) to OFF.
7 - Set the input circuit-breaker Q4S (9) to OFF.
8 - Wait until the display and LEDs go off.
The load is no longer protected by the UPS, but continues to be
supplied with AC power.
UPS maintenance or servicing can now be carried out.
1 - Check that the two UPS units are operating.
2 - Press a button to exit sleep mode.
3 - Shut down the UPS by pressing the OFF button (38) for 3 seconds.
4 - Set output switch Q5N (11) to OFF.
5 - Set the battery circuit-breaker QF1 (13) (or set the battery circuit-
breakers of the auxiliary cabinets if any) to OFF.
6 - Set the input circuit-breaker Q1 (8) to OFF.
7 - Set the input circuit-breaker Q4S (9) to OFF.
8 - Wait until the display and LEDs go off.
The load is still protected by the other UPS unit.
Maintenance or servicing can now be carried out on the UPS unit that
has been shut down.
1 - Press a button to exit sleep mode.
2 - Shut down the UPS by pressing the OFF button (38) for 3 seconds.
3 - Set bypass switch Q3BP (10) to ON.
4 - Set output switch Q5N (11) to OFF.
5 - Set the battery circuit-breaker QF1 (13) (or set the battery circuit-breakers of the auxiliary cabinets if any) to OFF.
6 - Set the input circuit-breaker Q1 (8) to OFF.
7 - Set the input circuit-breaker Q4S (9) to OFF.
8 - Wait until the display and LEDs go off.
The load is no longer protected by the UPS, but continues to be supplied with AC power.
UPS maintenance or servicing can now be carried out.
Q1 Q4S Q3BP Q5N
QF1
13
8
10
11
9
IO
3s
38
Q1 Q4S Q3BP Q5N
QF1
13
8
10
11
9