Tip & How-To about APPROVED VENDOR Potential Relay, 35A, Pick Up 166 to 180 - 5MLY9
To size a potential relay you must read the Start winding voltage (the BEMF)
which will be above the supplied line voltage, in this example I use 300 volts for math.
BEMF = 300 volts,
300v x ,50 = 150v minimum
300v x .80 = 240v maximum
300v x 1.20 = 360v continuous
So you want the Start capacitor to stay in the circuit to at least 150v BEMF or risk stalling, and you do not want the Star capacitor to stay in beyond 240v BEMF or risk
exploding the Start capacitor.
The 120% continuous rating is to oversize the coil in the potential relay that remains in the system to protect it .
If you have a compressor that is not running you will need to jump it with a Start capacitor(a large one) to the run capacitor for 1 second or so to bump start the compressor, then you can read the Start winding for the BEMF reading.
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