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9 – Start-Up, Shutdown and Bypass
9-10 Manual Bypass Procedure (Parallel UPS)
•
If the UPS systems have external battery cabinets connected,
5
switch off the external battery cabinet circuit breaker switch
each battery pack.
•
In this mode, only the output circuit breaker switch
6
terminal block
contain hazardous voltage, allowing qualified
B
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,
1
switch on the external battery cabinet circuit breaker switch
each battery pack.
•
2
Switch on the bypass input circuit breaker switch
circuit breaker switch
of each UPS system.
B
•
3
Confirm that the LCD screens of both UPS systems read "ON
MANUAL BYPASS", then switch off the manual bypass input
circuit breaker switch
of each UPS system. The LCD screen
A
will read "ON AUTO BYPASS".
•
Switch on the main input circuit breaker switch
4
system.
•
Press the ON button
of the first UPS systems for 3 seconds
5
A
(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.
Output
Manual
Bypass
4
(continued)
of
A
and the
A
A
of
A
and the output
A
of each UPS
A
Bypass
Main
Input
Input
(continued)
A
5
A
6
A
1
B
Output
Manual
Bypass
2
Output
Manual
Bypass
3
5
31
B
A
Bypass
Main
Input
Input
A
Bypass
Main
Input
Input
A
1
2
3
4
5
6
7
8
9
10
11
12
13
14
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