31
1
5
9
3
7
11
2
6
10
4
8
12
13
14
9 – Start-Up, Shutdown and Bypass
(continued)
9-10 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.
9-11 Switching from Manual Bypass to Normal Mode (Parallel UPS)
If the UPS systems have external battery cabinets connected,
•
switch on 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 the LCD screens of both UPS systems read “ON
•
MANUAL BYPASS”, 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
A
B
Output
Output
Manual
Bypass
Manual
Bypass
Bypass
Input
Bypass
Input
Main
Input
Main
Input
A
A
A
