90
UPS for 400 Vac Grid, Installation Guide, doc. rel. 3.0
7.3.
Transferring the UPS back to normal mode from
maintenance Bypass mode
In maintenance bypass operation, the UPS's ac circuit breakers are positioned as shown in Table
13 (see Figure 62 for CB locations).
Table 13: Maintenance bypass operating position of the circuit breakers
Battery box input
(on battery box)
Rectifier ac input
(CB 2)
Bypass ac input
(CB 3)
UPS AC output
(CB 5)
Maintenance bypass
(CB 6)
OFF
OFF
OFF
OFF
ON
To put the system in normal mode
operate the UPS’s ac circuit breaker as follows
:
1.
Switch ON the RECTIFIER AC INPUT circuit breaker.
2.
Switch ON the BATTERY circuit breaker.
3.
Switch ON the BYPASS AC INPUT circuit breaker.
4.
Switch ON the UPS (
Operation > System on
).
Wait for the system to automatically transfer to inverter once all the power modules are
operational.
5.
On the system controller LCD screen press
Operations > Transfer load to bypass
.
6.
Verify that the bypass indicator is lit on the controller.
7.
Switch ON the AC OUTPUT circuit breaker.
8.
Switch OFF the MAINTENANCE BYPASS circuit breaker.
9.
On the system controller LCD screen select
Operations > Transfer load to inverter
.
10.
Verify that the load is being supported by the inverters on the Status screen.
Figure 63: Position of the CBs in normal mode
Battery box
input
(on battery box)
Rectifier ac input
(CB 2)
Bypass ac
input
(CB 3)
UPS AC
output
(CB 5)
Maintenance bypass
(CB 6)
ON
ON
ON
ON
OFF