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Discussion Starter · #1 ·
Do any of you Generac gurus know what would cause a periodic "under voltage" alarm on the control panel? Clearing the alarm seems to leave the unit operating fine.
 

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Electrical Simpleton
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Do any of you Generac gurus know what would cause a periodic "under voltage" alarm on the control panel?
I don't know... maybe a periodic under-voltage? :jester:

j/k try not to get mad at me... couldn't resist.

Pete
 

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I pretwist and then use wire nuts. Solder pots rule.
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Is it an alarm for line voltage or battery?
If battery then check the charger.
If its line sag, you might be able to adjust the low limit for start up.
Here we would sag on a 208 system down to 185 during the hottest days of summer. 183 is what I set our generator bank to start at.
I've never worked a generac but I hope this helps.
 

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Discussion Starter · #6 ·
Sorry, it does not appear to be a running issue. As best I can tell, it occurs at times when the unit is in the "ready to run" mode, but of course never when anyone is around. :(
 

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Thumper
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Is it an alarm for line voltage or battery?
If battery then check the charger.
If its line sag, you might be able to adjust the low limit for start up.
Here we would sag on a 208 system down to 185 during the hottest days of summer. 183 is what I set our generator bank to start at.
I've never worked a generac but I hope this helps.
Yikes! All the way down to 185! That's lower than I've seen! Anybody seen lower?
 

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If its line sag, you might be able to adjust the low limit for start up.
Here we would sag on a 208 system down to 185 during the hottest days of summer. 183 is what I set our generator bank to start at.

I think Wirenutting is on the right track. I have voltage sag here in Los Angels in the peak of summer.
 

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I pretwist and then use wire nuts. Solder pots rule.
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Ken2972 said:
If its line sag, you might be able to adjust the low limit for start up. Here we would sag on a 208 system down to 185 during the hottest days of summer. 183 is what I set our generator bank to start at. I think Wirenutting is on the right track. I have voltage sag here in Los Angels in the peak of summer.
The oldest Asco ATS's we had were all open relay. The springs were calibrated and would start to hum and shiver when the line was so low.
When I was in out generator room I would open the doors to the switches and turn off the lights.
You could see the sparking as they chattered before dropping out. Looked like a miniature 4th of July.
The other shop electricians hated me doing that to them. Of course they hated when we would send them work orders for lights in the morgue trays. I would lay and wait for them to open the draw.
 

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Budweiser,Bahamas,& ESPN
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Those first Nexus units have/had a lot of control board issues. Everything is built into the control panel. We've replaced a lot of control panel with upgraded boards. See if the part # is 0H6680A or B.
 

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Can't Remember
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I have one of those out there with the early nexus board. It was replaced once for some intermittent issue that was covered. That same unit went into undervoltage recently. Cleaned brushes and slip rings and it was running well again.
 

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The oldest Asco ATS's we had were all open relay. The springs were calibrated and would start to hum and shiver when the line was so low.
When I was in out generator room I would open the doors to the switches and turn off the lights.
You could see the sparking as they chattered before dropping out. Looked like a miniature 4th of July.
The other shop electricians hated me doing that to them. Of course they hated when we would send them work orders for lights in the morgue trays. I would lay and wait for them to open the draw.

Thats funny.:thumbup:
 
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