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3-5. Parallel Operation (Only for the parallel models)
1. Parallel system initial startup
First of all, please make sure all of the UPSs are parallel models with same configuration.
1) Turn on each UPS to AC mode respectively (Refer to section 3-4(1)). Then, measure the inverter
output voltage of each phase for each UPS with multimeter. If the difference between real output
voltage and setting value is more than 1.5V, please calibrate the voltage by configuring inverter
voltage adjustment (Refer to Program 15, 16 and 17 in section 3-7) in LCD setting. If the difference
remains more than 1.5V after calibration, please contact your local distributor or service center for
help.
2) Calibrate the output voltage measurement by configuring output voltage calibration (Refer to
Program 18, 19, and 20 in 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 3-4(7.)). Then, follow the wiring procedure in section 2-4.
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.
5)
Turn on the parallel system in AC mode:
a)
Turn on the line input breaker of each UPS (for dual input, also turn on bypass input breaker).
After all UPSs enter bypass mode, measure the output voltage between two UPSs in the same
phase to make sure the accuracy of phase sequence. If these two voltage differences are near
zero, that means all connections are correct. Otherwise, please check if the wirings are
connected correctly.
b)
Turn on the output breaker of each UPS.
c)
Turn on each UPS in turns. After a while, the UPSs will enter AC mode synchronously and then,
the parallel system is completed.
6)
Turn on the parallel system in Battery mode:
a)
Turn on the battery breaker (only available in long-run model) and output breaker of each UPS.
b)
Turn on any UPS. A few seconds later, the UPS will enter battery mode.
c)
Then, turn on another UPS. A few seconds later, the UPS will enter battery mode and be added
to the parallel system.
d)
If the third UPS is in parallel, follow the same procedure in c). Then, the parallel system is
complete.
If more detailed information of parallel operation is needed, please contact supplier or service
center.
2. Add one new unit into the parallel system
1) New unit can be added into the parallel system when whole system is running. You must cut off the
load and shut down the system.
2) Make sure all of the UPS are the parallel models, and follow the wiring. Please refer to section 2-4.
3) Install the new parallel system. Please refer to the section 3-5.
3. Remove one unit from the parallel system
There are two methods to remove one unit from the parallel system:
First Method:
1)
Press the “OFF” key twice and each time should last for more than 0.5s. Then, the UPS will enter
bypass mode or no output mode if there is no.
2)
Turn off the output breaker of this unit, and then turn off the input breaker of this unit.
3)
After it is shut down, you can turn off the battery breaker (for long-run model) and remove the
parallel and share current cables. And then remove the unit from the parallel system.
Second Method:
