A phase out of range condition exists on the bypass input

[Anonymous user]

Hello, 

the power room of my office has 4 UPS connected as follows

2 units of MGE Galaxy 5500 UPS 80kVA connected in parallel

and 

2 units of MGE Galaxy 5500 UPS 40kVA connected in parallel, 

strangely, i observed the following alerts in the last couple of days which appears to be in-consistent. All 4 ups are connected to the same Stabilizer and power source.

80kVA UPS#1: the latest event “A phase out of range condition exists on the bypass input” took place on the 14^th of August

80kVA UPS #2: the latest event “A phase out of range condition exists on the bypass input” took place on the 2^nd of August

40kVA UPS #1: the latest event “A phase out of range condition exists on the bypass input” took place on the 29^th of August

40 kVA UPS #2: the latest event “A phase out of range condition exists on the bypass input” took place on the 25^th of July

in the past, i usually received the alerts from all 4 ups at the same time. 

please note that my installation is in Africa where power isn't so stable, hence we switch to a standby generator during power outages.

please what do you advise?

[BillP · Accepted solution]

Hi

The UPS is indicating that your input supply is outside of tolerances.  This means you would need to check your input supply for the correct rated voltage/frequency levels.  You state yourself that the "power isn't so stable".  Hence I would recommend you to get your local electrician to carry out a full power quality analysis/report on your input supply.

If you have any further questions, please do not hesitate to ask me.

Kind Regards

Haseeb