Answer / ayaz

MR Carl Ellis 
   Solenoid in workshop not in service and no specification on the solenoid how to know we usage solenoid
for example field supply for solenoid is 24 v dc and no new in warehouse and how to check and  use older solenoid without specification 

Answer / carl_ellis

1) Put a voltmeter on the solenoid terminals and see what the control signal supply voltage is. It could be AC or DC.

2) Go back to the control signal source and trace the wires until it becomes apparent what the control signal voltage is.

3) Dig out the electrical drawings and see what control signal the circuit was designed for.

4) Measuring winding resistance is dicey (not terribly reliable) because the wattage ratings on solenoid coils covers a range of about 3:1, so the difference between a DC coil and an AC coil, or between a 6 or 9 watt coil is overlapped by different wattage coils for different services.

Carl Ellis
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