Generator Failure
Panda PMS AGT-DC 4000 - Chapter C: Generator Failure Page 33
Wiring diagram
C.4.2 Coil Resistance Measurements in Stator Windings
If the testing set determined no earthing, the coil windings of the generator must be controlled
with a resistance measuring instrument (ohm meter). To measure coil resistance a meter capable
of measuring low resistances (Milli-Ohm resolution if possible) accurately. The measured resi-
stance values should be close to the same between the following terminals:
U1-U2, V1-V2, W1-W2
Checking windings.
• Disconnect all connections from the power terminal box. Loose the nuts and deduct the cables.
• Remove all winding connections from the power terminal box.
• Switch your meter in resistance range. When you put the probes of you meter together, you
should get a reading of 0.00Ohm. When you isolate the probes, the reading will be Overflow.
Please do this tests to check your meter.
• Measure of the resistance within the individual windings. The values should be very small. It
mainly depends on the relation between the values. Some measuring instruments operate very
inaccurately, if the measured values are very small.
• Resistance measure between different windings. If the value is in the Giga ohm area, the coil
is correct.
If you find any anormality, when doing this test, please ask your Fischer Panda dealer.
If strong deviations are measured in the individual coil windings, there is a coil short-cut in one
coil. No voltage is induced.
The actual values between the coil windings are not determined so exactly. It depends on the fact
that the values of all three measurements are as alike as possible. Deviations among themselves
refer to a coil short-cut. In this case the generator must be newly wound by a specialist.
