Fischer Panda Panda 14.000 NE PVK-U, Operating Instructions Manual

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Generator Failure
Panda 14.000 NE PVK-U S00420 - Chapter D: Generator Failure Page 53
Wiring Diagram
D.2 Testing Generator Stator Winding for "Shorts" to Ground
If no faults are found with the capacitors and the generator is still not performing correctly, the
generator stator windings must be tested for "shorts" to ground as follows:
1. Ensure that the generator is "OFF" and cannot be accidentally started. Disconnect the battery
leads.
2. Remove AC output terminal box lid (mounted on generator casing).
3. All terminal box connections are to be removed. (See appropriate circuit diagram.)
4. Remove all cables (also earth lead).
5. A check of the generator terminal box is made by means of a multimeter to determine whether
there is continuity between the individual windings connections and the casing (N):
50 Hz-System: L1-N, L2-N, L3-N
If continuity is detected for any of the combinations, the generator must be sent to the factory for
inspection and repair. If this is not possible, the stator can be rewound by a qualified tradesper-
son/technician. Winding diagrams can be obtained from ICEMASTER GmbH, Germany, if neces-
sary.
This test, unfortunately, is carried out at very low voltage (9V) when a normal multimeter is used.
Therefore only positive short circuits will be displayed. There is the possibility that a short circuit
will occur in spite of a negative test result (i.e. moisture). A reliable check can only be carried by
using an essentially higher voltage (approx 500V). This type of measuring instrument is normally
only used by experts.
If in doubt an electrician must check the winding for a short circuit with an isolation meter.
D.3 Coil Resistance Measurements in Stator Windings
When there are neither faults with the capacitors nor any low or high voltage "shorts" in the win-
dings to ground, the windings should then be tested for the correct coils resistance (for shorts bet-
ween wires within the coils). To measure coil resistance a meter capable of measuring low
resistances (Milli-Ohm resolution if possible) accurately. The measured resistance values should
be close to the same between the following terminals:
L1-N, L2-N, L3-N.