Delta Modulon DPH 200kVA, User Manual, Page: 121 / 232

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6
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UPS Operation
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Pre Turn-off Warnings for Single Unit
If you perform turn-off procedures for single unit, all power will be completely cut off.
Please make sure the critical loads connected to the UPS have already been safely shut
down before you perform the turn-off procedures.
Parallel Units
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Pre Start-up Warnings for Parallel Units
1. You can parallel at maximum eight UPS units.
2. For parallel units, ensure that each parallel cable (provided) is connected well.
3. Make sure that all of switches and breakers, including every external battery cabinet’s
breaker, are turned to the OFF position.
4. Make sure that each UPS and Delta or non-Delta External Maintenance Bypass
Cabinet’s voltage difference between the Neutral (N) and Ground ( ) is < 3V.
5. Check if the wiring is correct. Ensure that the AC power’s voltage, frequency, phase
and battery type meet the UPS’s requirements.
6. Check if all power modules are properly installed and every power module’s switch
is in the upper position ( ). Please refer to
5.8 Power Module (Optional)
for more
information.
7. For parallel units, ensure that every operation procedure mentioned below is
synchronized to all parallel UPSs.
8. For parallel application, if you just want to operate a specific UPS but not all parallel
ones, please contact service personnel.
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Pre Turn-off Warnings for Parallel Units
1. If you want to turn off one of the parallel UPSs, please check whether the remaining
parallel units’ total capacity exceeds the total critical loads. If the remaining parallel
units’ total capacity is less than the total critical loads, all parallel units will shut down
due to overload.
2. If you perform turn-off procedures for all parallel UPSs, all power will be completely
cut off. Please make sure that the critical loads connected to the parallel UPSs have
already been safely shut down before you perform the turn-off procedures.