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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 the voltage 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, 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 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.
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 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 more detail information is needed, please contact supplier or service center for 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)
Press the “OFF” iron twice. 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 (for long-run model) 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 can not remove the UPS without interruption. You must cut off the load
and shut down the system first.
2)
Make sure the bypass setting is enabled in each UPS and then turn off the running system. All UPSs will
transfer to Bypass mode. Remove all the maintenance bypass covers and set the maintenance switches
from “UPS” to “BPS” position. Turn off all the input breakers and battery breakers in parallel system.
3)
Turn off the output breaker and remove the parallel cable and share current cable of the UPS which you
want to remove. Now, you can remove the UPS from parallel system.
4)
Turn on the input breaker of the remaining UPS and the system will transfer to Bypass mode.
Set the
maintenance switches from “BPS” to “UPS position and put the maintenance bypass covers back on.
