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26
8 – Start-Up, Shutdown and Bypass (continued)
8-9 Shutdown Procedure (Parallel UPS—MUS)
Warning: The UPS system shutdown procedure will eliminate the AC power output for all loads. Before shutdown, confirm that all loads
are turned off or place the UPS systems in manual bypass mode (See Section 8-10) to keep loads powered by the bypass power path.
• For the 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 systems can support the connected equipment
loads alone, the UPS system that was turned off will shut down its
inverter and its LCD screens 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
the remaining UPS systems, all UPS systems will shut down their
inverters and switch to bypass mode, and their LCD screens will
read “ON AUTO BYPASS”.
Confirm the UPS you wish to shut down is in bypass mode (amber
bypass LED
B
is on, LCD displays “ON AUTO BYPASS”).
• For the UPS system you wish to shut down, switch off the main
input circuit breaker switch
Q1
, then switch off the output circuit
breaker switch
Q4
.
• For the UPS system you wish to shut down, switch off the bypass
input circuit breaker switch
Q2
.
• When the UPS system is completely shut down, the LCD screen
will be completely off. Wait until the power module fans power off
and the LCD display goes blank (this may take a minute or two).
Then, switch off the external battery cabinet circuit breaker switch
of each battery cabinet connected to the UPS you wish to shut
down.
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.
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12-212-93-3141.indb 26 12/28/2012 11:17:47 AM