24
PRELIMINARY
1 Basic Operation (continued)
1.6 Start-Up, Shutdown and Bypass (continued)
1.6.10 Manual Bypass Procedure (Parallel UPS) (continued)
If the UPS systems have external battery cabinets connected, switch •
off the external battery cabinet circuit breaker switch
A
of each
battery pack.
In this mode, only the output circuit breaker switch •
A
and the
terminal block
B
contain hazardous voltage, allowing qualified
service personnel to perform maintenance or repair. Note:
Qualified service personnel may prefer to de-energize the UPS
systems completely, depending on local codes and the nature of the
maintenance or repair.
1.6.11 Switching from Manual Bypass to Normal Mode (Parallel UPS)
If the UPS systems have external battery cabinets connected, switch •
off the external battery cabinet circuit breaker switch
A
of each
battery pack.
Switch on the bypass input circuit breaker switch •
A
and the output
circuit breaker switch
B
of each UPS system.
Confirm that both UPS systems are shut down, then switch off the •
manual bypass input circuit breaker switch
A
of each UPS system.
The LCD screen will read “ON AUTO BYPASS.”
Switch on the main input circuit breaker switch •
A
of each UPS
system.
Press the ON button •
A
of the first UPS systems for 3 seconds
(until you hear a beep), then release the button. Press the ON button
for the second UPS system for 3 seconds (until you hear a beep),
then release the button. When the inverter of each UPS system is
operating normally, they will switch to online (normal) mode at the
same time.
5
1
2
3
5
4
5
1
6
2
3
4
5
A
A
6
A
B
Output Manual
Bypass
Bypass
Input
Main
Input
AB
Output
Output
Manual
Bypass
Manual
Bypass
Bypass
Input
Bypass
Input
Main
Input
Main
Input
A
A
A
