UPS for 208 Vac Grid, Installation Guide, doc. rel. 3.0
92
Then, operate the UPS's ac circuit breakers as follows:
1.
Switch ON the MAINTENANCE BYPASS circuit breaker.
2.
Switch OFF the AC OUTPUT circuit breaker.
3.
Switch OFF the RECTIFIER AC INPUT circuit breaker.
4.
Switch OFF the BYPASS AC INPUT circuit breaker.
5.
Switch OFF the BATTERY INPUT circuit breaker.
The switches are now positioned as shown in Table 10 below.
Table 10: Position of the CBs in maintenance bypass 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)
OFF
OFF
OFF
OFF
ON
6.
Verify 0V across all terminals in the system.
The system is now in maintenance bypass mode and can now be safely serviced.
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
11 (see Figure 71 for CB locations).
Table 11: 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
.
Summary of Contents for B60US-IB
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