Chapter 7 UPS Operation
64
7.2.6.1 From Normal Mode to Manual Bypass Mode (Parallel)
WARNING:
If you perform the following turn-off procedures to each parallel UPS, all
power supplying to the UPS will be completely cut off. Please make sure
the critical loads connected to the UPS have already been safely shut down
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1. Press one of the parallel UPSs’ ‘
OFF
’ and ‘
’ buttons simultaneously for 3
seconds. If the total connected loads are less than the total capacity of the rest
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will display ‘
Inhibit Output
’. Now, the total loads will be equally shared by the
rest of the parallel UPSs.
If the total loads are greater than the total capacity of the rest of the parallel
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power is normal (the voltage and frequency of the reserve AC power is within the
setup range). After that, it will be the reserve AC power to supply power to the
connected loads and each UPS’s LCD will display ‘
Bypass Mode
’.
2. Repeat the above-mentioned
Step 1
to the rest of the parallel UPSs in order to
let all parallel UPSs run in ‘
Bypass Mode
’.
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Battery
breaker.
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breaker.
5. (1) Wait about 5 minutes for each DC CAP to discharge, and ensure that each
LCD shows the battery voltage lower than 5V.
Or, (2) Press each UPS’s ‘
ON
’ and ‘
OFF
’ buttons simultaneously for 3 seconds
to let its DC CAP to discharge, and ensure that each LCD shows the battery
voltage lower than 5V. After confirmation, press each UPS’s ‘
OFF
’ and ‘
’
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6. Turn on each parallel UPS’s
Manual Bypass
breaker. The connected loads will
be power-supplied by the manual bypass and each LCD will display ‘
Manual
Bypass ON
’.
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UPS Output
breaker and
Reserve Input
breaker.
8. Disconnect all fuses. After that, each LCD will be
OFF
.
