I am new here and i guess i should have gave more info. I only condemn when the tap is getting low voltage power and the motor has 120v. Not just 120v alone. Sorry for my vagueness. Thanks for clearing that up. I was just suggesting not spending alot of valuable time figuring out what part of the head might actually be broken. Even though it may be a cheap quick solder piece to fix it, to me that opens up your company for liability. I would rather replace with a complete factory built motor so if it ever caught fire or something they cant come back and say you modified the motor or something. Just my 2C.
Also worth noting for those unaware, VS ECM motors are DC and not AC. There is a circuit similar to a diode bridge or wheatstone bridge that rectifies the incoming AC to DC. And also, troubleshooting the "control heads" is very simple.
Basically, just verify the line voltage supply, if present, use something like the cheap tech mate switch to see if the motor runs.
If it has line voltage, and does not run when the control signal is applied with the tech mate, pull the module off and ohm out the motor windings.
If you don't get anything to ground on either of the 3 motor leads, and the resistance is the same lead to lead on all 3, and the motor bearings are good, replace the module only.
If any of the 3 resistance measurements lead to lead are different than the other 2 readings, but there is no reading to ground, or the motor bearings are bad, replace just the motor.
If you get a reading to ground on any of the 3 leads, replace both the motor and module.
You can even make a simple go/no go tester out of a spare 16 pin control harness, and a 9v battery.
I know, I figured with all of the module failures that the suppliers would have figured out it would save every one (except motor manufacturer but motors are out sourced) time and money. I have never seen a ecm motor where it wasnt the module and most the failures have been a few years old. I havent replaced many lately so hopefully the got the problem at least contained.
And Gary, I think a dedicated thread on ECM's is fantastic idea. I may be able to offer some insights into these mysterious black holes. I was once a product engineer for Carrier involved in one of the very first ECM deployments in a commercial airside product.
on the x13 motor if you have high voltage andlow voltage to the motor and it aint running its bad
How many failures ahve you seen where the motor windings have failed vs. just the drive module?