15
Jumper
High voltage cut
off (V)
High voltage cut
off come back
(V)
Low voltage cut
off (V)
Low voltage cut
off come back
(V)
JP18=0 /JP19=0
307
297
139
159
JP18=1 /JP19=0
267
252
139
159
JP18=0 /JP19=1
307
297
90
100
JP18=1 /JP19=1
267
252
90
100
*1: With jumper connected. 0: NO jumper connected.
**Default setting is JP18=0 /JP19=1.
3-5. Parallel Operation
1. Parallel system initial startup
First of all, please make sure all of the UPSs are parallel models and have the 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 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 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 UPS 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 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 to 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.
NOTE:
It’s not allowed to share one battery pack for long-run UPSs in parallel system. Each UPS
should be connected to its battery pack.
b) Turn on any UPS. A few seconds later, the UPS will enter to battery mode.
c) Then, turn on another UPS. A few seconds later, the UPS will 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 detailed information is needed, please contact supplier or service center for parallel operation
instruction.
