Misswiring issue

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Dodge1217
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Thu Jan 09, 2020 6:38 pm

Can reversing the 12v dc and utility sensing circuits on a 22kw evo2 controller damage the controller. Installers had miss wiring error code in the alarm log and now the controller will not put out the 12v on wire 194 after the start up timer expires.
Chris
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Thu Jan 09, 2020 9:13 pm

In short, yes. It's more likely that you fried the load shed/transfer switch controller. Remove the 194 wire from the SACM and then test for 12V on the wire and at the gen with the unit in auto. If you have 12V it's likely that the SACM is cooked. There should always be 12V on the 194 wire when the unit is in auto mode (even off) it's what powers the SACM. The 23 wire gets closed to ground to actuate the switch.

The SACM (transfer switch controller) modules can be found here: https://shop.gentekpower.com/products/g ... hed-module
The Evolution 2.0 controllers can be seen here: https://shop.gentekpower.com/products/g ... trol-panel
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Dodge1217
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Fri Jan 10, 2020 5:09 am

194 hold the 12v fine in auto until the warm up timer expires. I baypassed the the controller (since the 12v was being lost after timer expires) via 194 straight to the positive post of the battery and everything transferred as normal. This is what lead me to believe the controller is damaged. Does this seem correct?
Dodge1217
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Fri Jan 10, 2020 5:10 am

Thank you for the quick response!
Chris
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Fri Jan 10, 2020 9:42 am

Yes, that does sound like you're getting phantom 12V with a digital meter and then when an actual load is applied via the transfer relay, there is an open somewhere which shows itself. When you connect the 194 lead right to the battery, does the load shed module light up like it should?
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Dodge1217
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Fri Jan 10, 2020 4:45 pm

Not sure at the moment. I know the LED were lit at one time. Once I saw that applying the positive from the battery energized the transfer relay I stopped; assuming that the controller was bad. I assumed that if I applied the positive battery voltage to 194 and everything transferred and operated like normal then the controller had grounded 23 but was lacking the need 12v via 194. Am I thinking this through clearly or could it still be the transfer relay?
Chris
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Fri Jan 10, 2020 5:22 pm

It does sound like you have a bad controller if you're not getting 12V power on the 194 wire all the time when in Auto mode. I just like to eliminate all the possibilities before replacing an expensive controller.
Generac tech for over 12 years. I'm here to help!
"The only source of knowledge is experience" -Albert Einstein
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