Delta Modulon DPH Series User Manual page 113

3. Check if the wiring is correct. Ensure that the AC power's voltage, frequency, phase
sequence and battery type meet the UPS's requirements.
4. Check if all power modules are properly installed and every power module's switch
is in the upper position (
information.
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
Parallel Units
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 the switches and breakers, including every external battery
cabinet's breaker (Q5), are turned to the OFF position.
4. Make sure that each parallel UPS'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
sequence 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 (
information.
7. For parallel units, ensure that every operation procedure is synchronized to all
parallel UPSs.
ones, please contact service personnel.
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
). Please refer to 5.8 Power Module (Optional) for more
). Please refer to 5.8 Power Module (Optional) for more
6-3
6 UPS Operation