34001813EN/AE - Page 55
4. Maintenance
Parallel UPS configuration without external bypass cabinet

Restart the UPS unit for which switch Q3BP (10) is ON and the other switches are OFF.

Restart the UPS unit for which all switches are set to OFF.

Caution. It is imperative to restart this UPS unit. Otherwise, load power is cut if the other two UPSs are shut down.
1 - Set the input circuit-breaker Q4S (9) to ON.
2 - Set output switch Q5N (11) to ON.
3 - Check that the UPS is listed by the display, then confirm by pressing
the function keys (35).
4 - Set bypass switch Q3BP (10) to OFF.
5 - Set the input circuit-breaker Q1 (8) to ON.
6 - Set the battery circuit-breaker QF1 (13) (or set the battery circuit-
breakers of the auxiliary cabinets if any) to ON.
The UPS unit starts automatically. LED (31) is ON.
The load is protected by the UPS.
If LED (31) remains OFF, press the ON button (37)
If LED (31) still remains OFF and either of LEDs (32) or (33) is ON, a fault
has occurred (see section 4.1).
1 - Set the input circuit-breaker Q4S (9) to ON.
2 - Set output switch Q5N (11) to ON.
3 - Check that all the UPS units present in the installation are included in
the list on the display and confirm by pressing the function buttons (35).
4 - Set the input circuit-breaker Q1 (8) to ON.
5 - Set the battery circuit-breaker QF1 (13) (or set the battery circuit-
breakers of the auxiliary cabinets if any) to ON.
The UPS restarts and LED (31) is ON.
If LED (31) remains OFF, press the ON button (37)
(the system is in manual start mode).
If LED (31) still remains OFF and either of LEDs (32) or (33) is ON, a fault
has occurred (see section 4.1).
Q1 Q4S Q3BP Q5N
QF1
13
810 11
9
IO
3s
37
31 32 33
Q1 Q4S Q3BP Q5N
QF1
13
810 11
9
IO
3s
37
31 32 33
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