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APC NetworkAIR FM-40 - Off Line, Mains Failure

APC UPS Data Center & Enterprise Solutions Forum

Schneider Electric support forum for our Data Center and Business Power UPS, UPS Accessories, Software, Services, and associated commercial products designed to share knowledge, installation, and configuration.

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clchee_apc
Ensign
Ensign
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APC NetworkAIR FM-40 - Off Line, Mains Failure

This was originally posted on APC forums on 2/26/2014


Dear Experts,

My customer is facing problem with their APC NetworkAIR FM-40 CRACK.

They have 2 units running in N+1 config. At the moment, backup unit is still running but very unstable. Engineers suspect blower is about to give up.

As for the primary unit, engineers are still trying to pin point the part or module that's causing this problem. Error message is Mains A & B Failure.

Enclosed herewith are some screenshots & event logs extracted from the unit. Urgently need help & opinion.

We've checked mains breaker at the CRACK and input power is within range.2172_Picture1.jpg2173_Picture2.jpg2174_Picture3.jpg2175_Picture4.jpg

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Abdallah_apc
Crewman
Crewman
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163

Re: APC NetworkAIR FM-40 - Off Line, Mains Failure

This was originally posted on APC forums on 6/23/2020


HI

I'm facing same problem . Did you find any other solutions ??

See Answer In Context

4 Replies 4
BillP
Administrator Administrator
Administrator
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Re: APC NetworkAIR FM-40 - Off Line, Mains Failure

This reply was originally posted by Angela on APC forums on 2/27/2014


L2SupportServices-Cooling - is this something that you could assist with please? Thanks!

BillP
Administrator Administrator
Administrator
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Re: APC NetworkAIR FM-40 - Off Line, Mains Failure

This reply was originally posted by L2SupportServices-Cooling on APC forums on 2/27/2014


Hello. The Mains A and B Failures come from two boards that monitor the main power coming in and the control voltages off the transformers. First check the transformers to make sure they have 24 volts between the red and black wires and 30 volts between the yellow and black wires on the transformers. If one of the transformers is bad, check for shorts in the unit before replacing it to make sure the new transformer is not bad. If the transformers are good. Check the line voltage coming into the Mains A board on connections 94-95-96. Make sure you have the appropriate voltages there. Check all the fuse blocks to make sure a fuse has not blown somewhere in the unit. If no faults are found, it would be best to call into the local tech support to get further troubleshooting to get live direction while with the unit.

Thank you

clchee_apc
Ensign
Ensign
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163

Re: APC NetworkAIR FM-40 - Off Line, Mains Failure

This was originally posted on APC forums on 2/28/2014


Dear L2Support,

Thanks that's very helpful. At least now we know what & where to look for faults.

Going over with local tech today. I will try out your methods.

Abdallah_apc
Crewman
Crewman
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0
164

Re: APC NetworkAIR FM-40 - Off Line, Mains Failure

This was originally posted on APC forums on 6/23/2020


HI

I'm facing same problem . Did you find any other solutions ??