Masterguard 6KVA UPS Inverter BackFeed

[noshad]

Hi friends.

We have 1 UPS which has following details.

Make : Master guard (Emerson) Series "E"
Rating: 6KVA
Single phase input/output 230VAC. 50 Hz

Today one alarm came "INVERTER BACKFEED" on display of UPS and UPS gone to Bypass mode. We reset the fault and again make it online . It work for 6 hours and same alarm came "INVERTER BACKFEED" and Ups gone to bypass mode. Reset the fault and UPS working normal again.
after reset follwing Measurements coming on UPS Display.
Input voltage : 237 V
Input Frequency : 49.9 Hz
Output Voltage : 230 V
Output Frequency : 49.9 Hz
Output Load : 33 percent
Output Current : 5 Amp
Output Watt : 1391 W
Output VA : 1468 VA
Batt Volt : 273 V
Batt Cap : 100 Percent
Backup : 39 min 47 sec
Positive DC bus : 361 V
Negative DC bus : 361 V

I tried to search at google regarding this fault but cannot find any information.

what is " Inverter Backfeed" Alarm? and what is the remedy for this type of alarm.

Advance Thanks.
I am working in a petrochemical plant. And this UPS is used for control power (PLC, and other control equipments)

 

[sibeen]

Wouldn't asking the manufacturer of the equipment be a better option than asking the question of a general engineering forum?

 

[ScottyUK]

Cross-posted in thread248-381794