GE AF-650 GP Operating Instructions Manual page 93

Verify the reference voltage power supply is correct as follows.
1. With a voltmeter measure voltage at control card terminal 50 with respect to terminal 55. Meter should read between 9.2 and 11.2 VDC.
If the 10 V supply voltage is not present, conduct the Control Card Voltage Test earlier in this section.
If the 10 volts is present proceed with checking the individual inputs as follows.
2. Connect (-) negative meter lead to reference terminal 55.
3. Connect (+) positive meter lead to desired terminal 53, 54 or 60.
For analog input terminals 53 and 54, a DC voltage between 0 and +10 VDC should be read to match the analog signal being sent to the drive.
For analog input terminal 60, a reading of 0.9 to 4.8 VDC corresponds to a 4 to 20ma signal.
Note that a (-) minus sign preceding any reading above indicates a reversed polarity. In this case, reverse the wiring to the analog terminals.
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High Power Service Manual for Unit Sizes 6x