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9 – Start-Up, Shutdown and Bypass (continued)
9-9 Shutdown Procedure (Parallel UPS) (continued)
For the UPS system you wish to shut down, switch off the bypass •
input circuit breaker switch
A
.
When the UPS system is completely shut down, the LCD screen •
will be completely off. If the UPS systems have external battery
cabinets connected, switch off the external battery cabinet circuit
breaker switch
A
of each battery pack.
Note: If the UPS system remains off for an extended period of time, it
should be turned on periodically to allow the batteries to recharge. The
UPS system should be turned on and the batteries should be recharged
at least one uninterrupted 24-hour period every 3 months. Failure
to recharge the batteries periodically may cause irreversible battery
damage.
9-10 Manual Bypass Procedure (Parallel UPS)
Warning: When the UPS system is in manual bypass, the inverter shuts down. Connected equipment loads are powered by the bypass
(reserve) power source and will not receive battery backup during a utility power failure.
For the first UPS system you wish to shut down, press the OFF •
button
A
for 3 seconds (until you hear a beep), then release
the button. If the other UPS system can support the connected
equipment loads alone, the UPS system that was turned off will
shut down its inverter and its LCD screen will read “LOAD NOT
POWERED”. The other UPS system’s LCD screen will read
“ONLINE MODE”. If the total connected equipment load is too
large to be handled by a single UPS system, both UPS systems
will shut down their inverters and switch to bypass mode, and their
LCD screens will read “ON AUTO BYPASS”. Repeat step 1 for
the second UPS system you wish to shut down.
Switch off the main input circuit breaker switch •
A
of each UPS
system.
Confirm that both UPS systems are shut down, then switch on the •
manual bypass input circuit breaker switch
A
of each UPS system.
The bypass (reserve) power source will power the loads and the
LCD screen will read “ON MANUAL BYPASS”.
Switch off the bypass input circuit breaker switch •
A
and the output
circuit breaker switch
B
of each UPS system. The LCD screen
will turn off completely.
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Output Manual
Bypass
Bypass
Input
Main
Input
A
A
A
Output
Output
Output
Manual
Bypass
Manual
Bypass
Manual
Bypass
Bypass
Input
Bypass
Input
Bypass
Input
Main
Input
Main
Input
Main
Input
A
A
AB
200706017 93-2688 SU manual 4C.indd 30200706017 93-2688 SU manual 4C.indd 30 11/29/2007 2:02:49 PM11/29/2007 2:02:49 PM