ON-LINE RACK
PH 9360 - PH 9301 .
3.6. Parallel Operation
1. Parallel system initial startup
First of all, please make sure all UPS’s are parallel model and have the same
configuration.
1) Turn on each UPS to AC mode respectively (Refer to section 3.5.1. Then,
measure the inverter output voltage of each phase for each UPS to check if the
inverter voltage difference between actual output and setting value is less than 1.5V
(typical 1V) with multimeter. If the difference is more than 1.5V, please calibrate the
voltage by configuring inverter voltage adjustment (Refer to Program 15, 16 and 17,
section 3.7.) in LCD setting. If voltage difference remains more than 1.5V after
calibration, please contact your local distributor or service centre for help.
2) Calibrate the output voltage measurement by configuring output voltage calibration
(Refer to Program 18, 19 and 20, section 3.7.) in LCD setting to make sure the
difference between real output voltage and detected value of UPS is less than 1V.
3) Turn off each UPS (Refer to section 3.5.7. Then, follow the wiring procedure in
section 2.3.
4) Remove the cover of parallel share current cable port on the UPS, connect each
UPS one by one with the parallel cable and share current cable and then, screw the
cover back.
2) Turn on the parallel system with utility power supply (in AC mode)
1) Turn on the line input breaker of each UPS (for dual input, also turn on bypass
input breaker). After all UPSs enter to bypass mode, measure the voltage difference
between two UPS for the same phase to make sure the phase sequence is correct. If
these two voltage differences are near to zero, it means all connections are correct.
Otherwise, please recheck if the wirings are connected correctly.
2) Turn on the output breaker of each UPS. Turn on each UPS in turns. After a while,
the UPS’s will enter to AC mode synchronously and then, the parallel system
installation is complete.
3) Turn on the parallel system without utility power supply (in Battery mode).
1) Turn on the battery breaker (only available in long-run model) and output breaker
of each UPS.
NOTE: It is not allowed to share one battery pack for long-run UPS’s in parallel
system. Each UPS should be connected to its own battery pack.
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