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CENTRIC 3x480, User Guide, rel. 1.7
Figure 78: The system is in bypass mode
Then, using the three maintenance bypass switches on the UPS rear:
4.
Switch ON the MAINTENANCE BYPASS switch (the middle switch).
5.
Switch OFF the ac OUTPUT switch (the right-side switch).
6.
Switch OFF the rectifier INPUT switch (the left-side switch).
The switches are now positioned as shown in Figure 79.
Figure 79: Switch positions in maint. bypass mode
7.
On the battery box, switch OFF the battery circuit breaker. Immobilize the battery box circuit breaker
with tape and a sign to prevent the circuit breaker from being switched ON while the UPS is being
serviced.
The system is now in maintenance bypass mode.
9.2 Returning the UPS to normal operation
To move the system from maintenance bypass mode to normal operation mode:
1.
Switch ON the battery circuit breaker.
2.
Switch ON the rectifier INPUT..
3.
Switch ON the UPS (refer to section 5.2.2.1).
4.
Go to the “Operation > Transfer Load” screen. Verify that the message “Inverter and bypass
synchronized” is displayed near the top of the screen, then select “Transfer Load to Bypass”..
5.
Go to the Status screen and verify that the system is in bypass mode.
6.
Switch ON the ac OUTPUT switch (the right-side switch).
7.
Switch OFF the MAINTENANCE BYPASS switch (the middle switch).
8.
Go to the “Operation > Transfer Load” screen and select “Transfer load to inverter”.
9.
Go to the Status screen and verify that the system is in inverter mode
(the message “UPS ON, NORMAL MODE” is displayed.
The loads are now supplied by the UPS.
