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3-5. Parallel Operation
1. Parallel system initial startup
Please make sure that all of the running UPSs are parallel models and have the same configuration.
1)
Turn on each UPS in AC mode respectively (Refer to section 3-4(1)). Then, measure the inverter
output voltage of each phase for each UPS with a multi-meter. Calibrate the inverter output voltage
by configuring inverter voltage adjustment (Refer to SETTING
Advance
Maintainer
VOL
CALI
Inverter CALI screen) in LCD menu until the inverter output voltage difference of each UPS
is within 1V or less.
2) Turn off each UPS (Refer to section 3-4(7.)). Then, follow the wiring procedure in section 2-4.
3) 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.
4)
Turn on the parallel system in AC mode:
a)
Turn on the line input breaker of each UPS and turn on bypass input breaker). After all UPSs
enter to bypass mode, measure the output voltage between two UPSs for the same phase to
make sure the phase sequence is correct. If these two voltage differences are near to zero,
that means all connections are met. 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 to AC mode synchronously and
then, the parallel system is now complete.
5)
Turn on the parallel system in Battery mode:
a)
Turn on the battery breaker and output breaker of each UPS.
b)
Turn on any UPS. A few seconds later, the UPS will enter to battery mode.
c)
Turn on another UPS. A few seconds later, the UPSs enter to Battery mode and add to the
parallel system.
d)
If you have the third UPS, follow the same procedure of c). Then, the parallel system is
complete.
If you would like to have more information regarding the parallel operation, please contact
your supplier or service center for detail parallel operation instruction.
2. Add new units into the parallel system
1) You can’t add one new unit into the parallel system when whole system is running. You must cut off
the load and shutdown the system.
2) Make sure all of the UPS are the parallel models, and follow the wiring refer to section 2-4.
3) Install the new parallel system refers to the previous section.
3. Remove units from the parallel system
There are two methods to remove units from the parallel system:
First method:
1)
Touch “CONTROL”
“Turn off UPS” and select “Yes” to turn of the UPS. Then, the UPS will enter
into Bypass mode or No Output mode without output.
2)
Turn off the output breaker of this unit, and then turn off the input breaker of this unit.
3)
After it shuts down, you can turn off the battery breaker and remove the parallel and share current
cables. And then remove the unit from the parallel system.
Second method:
1)
If the bypass is abnormal, you cannot remove the UPS without interruption. You must cut off the