duboisga
Guardian 11KW Model 70331 with Model RXSC200A3.
Had short between E1 and E2 wires which shut down the generator and gave a Low voltage code 1901. Corrected E1 & E2 wiring. Currently, systems recognizes utility power failure and generator cranks and runs after the 5 second pause. Transfer panel switch does not engage the lower solenoid. On restoration of utility power the panel recognizes the power and disengages the transfer switch and shuts down the generator. Tested voltage of E1 and E2 terminals at both generator and transfer panel and have 244V. Testing wires 194 and 23 to ground with follow results: at panel 194 to GND BUSS - .55VDC, 194 to 0 GND terminal - .46VDC; at generator 194 to GND LUG - .63VDC, 194 to 0 GND terminal - .62VDC. at panel 23 to GND BUSS - .54VDC, 23 to 0 GND terminal - .45VDC, at generator 23 to GND LUG - .54VDC, 23 to 0 GND terminal - .53 VDC.
From reading other posts it appears I may have fried the Smart AC Module. And if this is the case; I would like advice on this. Then, how difficult is it to replace the Smart AC Module which is part # 10000004183.
Thanks
Quote
78buckshot
Disconnect 194 and 23 from the terminal strip in the transfer switch, check voltage again. If you now have battery voltage on 194 you can bypass the load shed module and run a test outage to see if all of the other components are ok.
Quote
nrp3
This is the new board with the transfer relay built in so I don't know how much further he can go. I agree, I'd like to know whether I had 12v 194 to 0 with the wires disconnected. Replacement is fairly easy. I've changed a couple of these.
Quote
Peddler
I agree with 78Buckshot but I would start at the generator and disconnect the 23 & 194 wires on both ends. Verify the you have 12 VDC to ground on 194 on the generator side of the connection. 23 should be open to ground on the generator side. Then ohm across the 23 and 194 wires to the transfer switch to see if they are shorted and then the 194 to ground to see if it is shorted. If the 23 was shorted to ground it would normally shift to generator power as soon as the unit started. If all these ring clear then you probably do have a transfer switch board problem.
Quote
duboisga
Thanks guys. Been out of town for weekend. Will jump on disconnecting the wires in the morning and run test on them.
Quote
duboisga
Did following test. disconnected 194, 23, 0 GND wires at panel. Test voltage 194 to 0 GND - 13.3VDC, open between 23 and 0 GND, no voltage between 23 and 0 GND.
Disconnected wires at gen end. results from terminals 194 to 0 GND 13.3VDC, 23 to 0 GND open, ohm reading across 23 and 194 open/no short.
Do you think a new Smart AC module will fix my problem?
Thanks
Quote
duboisga
Can someone post a source for purchasing the smart ac module? Understand they are about $102.00.
Quote
george6488
Call Ziller Electric. You can get to their parts store at the top of this page. If you have the part number...you can get a quote or call them during the day.
Quote
duboisga
Thanks george6488
Part Number is 10000004183. Did a search on Ziller's website. Nothing turned up. Will call them tomorrow.
Quote
basicelectric
I'm having the same problem. But I get roughly 12v between 0 grnd to 194 and 0 grnd to 23, have not checked ohms between them. 
Quote
78buckshot
Read the voltage across the battery terminals, then read 194 to ground, they should be the same.
Quote
basicelectric
78 buckshot. They are the same.
Quote
78buckshot
I think you have a bad battery or bad charger, you should see 13.0 - 14.2 volts while the unit is at rest.
Quote
Peddler
something isn't quite right between #0 on the connection block and 194 you should read 0 volts because #0 is open to ground except when calling for a transfer.  It would be correct to read battery voltage at both the #0 and #194 (at the connection block) wire to frame ground.
Quote