Parallel Operation - Njoy Garun Series User Manual

• Some warning alarms can't be muted unless the error is fixed. Please refer
to section 3-3 for details.
10. Operation in warning status
• When Fault LED illuminates and the buzzer beeps once every second,
it means that there are problems for UPS operation. Users can read the
warning message(s) from "DATA LOG" menu. Please refer to the Section 3-2-
6 for details.
• Some warning alarms can't be muted unless the error is fixed. Please refer
to section 3-3 for details.
11. Operation in Fault mode
• When Fault LED illuminates and the buzzer beeps continuously, it means
that there is a fatal error with the UPS. Users can get the fault code from
"DATA LOG" menu. Please refer to the Section 3-2-6 for details.
• Please check the loads, wiring, ventilation, utility, battery and so on
after the fault occurs. Don't try to turn on the UPS again before solving the
issue. If the problems can't be fixed, please contact the distributor or service
personnel immediately.
• For emergency case, please cut off connection from utility, external
battery, and output immediately to avoid possible damage to the UPS or
equipment.
12. Operation in maintaining bypass mode
This operation is only available for professional or qualified technicians.
When the UPS needs to repair or service and then the load can't be shut off,
the UPS needs to turn to maintenance mode.
• First, turn off the UPS.
• Second, remove the cover of maintenance bypass switch on the panel.
• Third, turn the maintenance switch to "BPS" position and turn off the UPS
input breaker and output breaker.

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.
• 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-
50
meter. Calibrate the inverter output voltage by configuring inverter voltage
adjustment (Refer to SETTING ► VOL CALI screen) in LCD menu until the
inverter output voltage difference of each UPS is within 1V or less.
• Turn off each UPS (Refer to section 3-4(7.)). Then, follow the wiring
procedure in section 2-4.
• 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.
• 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.
• 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.
NOTE!
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
• 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.
• Make sure all of the UPS are the parallel models, and follow the wiring
refer to section 2-4.
• Install the new parallel system refers to the previous section.
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