Parallel Operation - Njoy Garun Series User Manual

3.4.12. Operation in maintaining bypass mode
NOTE!
This operation is only available for professional or qualified technicians!
When the UPS needs to repair or service and when 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

NOTE!
Garun series supports parallel operations up to 3 units. Parallel operation should
be done only by authorized personal only. Please contact technician that installed
the UPS if you need to start parallel operations.
3.5.1. 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-
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 2.5.
• Connect each UPS one by one with the data cable and share current
cable, as shown in below picture:
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• 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) In Bypass Mode, check INFO Menu to see if UPS communicates
correctly ("INFO"-> "BASIC" -> "PAGE 2"). PAR State will be Parallel
and PAR ID will be 1 and 2:
Basic Information Page1
c) Turn on the output breaker of each UPS.
d) 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 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.
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