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9 – Start-Up, Shutdown and Bypass (continued)
9-9 Shutdown Procedure (Parallel UPS)
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 to keep loads powered by the bypass (reserve) power source.
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 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”.
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. If the UPS systems have external battery
cabinets connected, switch off the external battery cabinet circuit
breaker switch
A
of each battery pack. On the SU20KX or
SU40KX, turn OFF the battery breaker on the back of the UPS.
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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