Njoy Ranger 30KR User Manual page 62

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 not add 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
reference in section 2-4.
• Install the new parallel system as per section 3-5.
3. Remove units from the parallel system
There are two methods to remove units from the parallel system:
First method:
• Touch "CONTROL"
Then, the UPS will enter into Bypass mode or No Output mode without
output.
• Turn off the output breaker of this unit, and then turn off the input
breaker of this unit.
• Turn off the battery breaker and remove the parallel and share current
cables. And then remove the unit from the parallel system.
Second method:
• If the bypass is abnormal, you can not remove the UPS without
interruption. You must cut off the load and shut down the system.
• Make sure the bypass setting is enabled in each UPS and then turn
off the 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.
• 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.
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"Off UPS" and select "Yes" to turn of the UPS.