Fischer Panda 10000x, Manual

Page: 122 / 190

Generator Failure
Seite/Page 122 - Kaptitel/Chapter 8: Generator Failure 10.6.16
Fig. 8.6.3-1: Type plate
The contacts which can be measured depend on the type
of the generator (see identification plate):
HP1 - 50 Hz: L, Z
HP1 - 60 Hz: L, Z
HP3 - 50 Hz: L1, L2, L3
HP3 - 60 Hz: L1, L2, L3, 1, 2, 3, 4
DVS - 50 Hz: L1, L2, L3, L1’
DVS - 60 Hz: L1, L2, L3, L1’, 1, 2, 3, 4
If a pass (beep) should be determined, the generator must be returned for examination in the plant, or it can also be
wound again locally. For this coil data can be requested.
8.6.4 Measuring the inductive resistance
Unfortunately the checking of the ohmic resistance permits still no reliable statement about the condition of the coil.
If the ohmic resistance values arise inequalities between the coils, that is a safe indication for the fact that the coil is
defective. To be exactly sure the inductive resistance of the coil have to be measured. For this a special measuring
instrument is necessary, which measures the inductance of a coil.
8.6.5 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.
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 ground.
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 trades person/technician. Winding diagrams
can be obtained from Fischer Panda GmbH, Germany.
This test, unfortunately, is carried out at very low voltage (9 V) 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 500 V). 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.