Fischer Panda 10000x, Manual

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Generator Failure
10.6.16 Kapitel/Chapter 8: Generator Failure - Seite/Page 129
8.7 Measuring the Coil Inductive Resistance
Unfortunately a reliable assessment of the winding's performance cannot be attained through checking only coil
resistances. However, the symmetry of the coil resistances is a good indicator of winding performance. If the coil
resistances are symmetric, the next step is to measure the winding's inductive resistance using a special meter
(capable of measuring milli-Henrys).
The coil induction is measured and compared in the same manner as the electrical resistance (i.e. the windings are
compared for symmetry). These parts must have the same values.
Note: These values strongly depend on the method of measurement (e.g. used instruments)
An alternative test method to check the stator windings can be performed as follows:
1. Ensure that the connection to the circuit system is disconnected.
2. All electrical wires in the generator terminal box must be disconnected.
3. Reconnect the battery connections.
4. Start the generator.
5. Measure the voltages between the following terminals and compare for symmetry: L1-N, L1-Z.
8.8 Generator provides no Voltage
8.8.1 Rotor Magnetism Loss and „Re-magnetizing“
After having stood idle for a longer period of time, or after having been shut down abruptly from operating under a
heavy electrical load, most asynchronous generators have difficulties achieving full excitation independently. The
remaining rotor magnetism is lost.
Notice!: Before working on the System read the section „Safety
Instructions“ in this Manual.
The magnetism required for excitation can be easily restored using a simple DC Battery. The generator must be
stopped to do this, that means the starter may not be actuated. DC is fed to a desired part of the winding from the
exterior for a short period. This can, for example, be carried out for by feeding DC to the windings from both
terminals of a 230 V (115 V) socket of the vehicles system. (This, of course, can only happen if there is no
connection to any power source). There must be a connection between socket and the generator (see diagram
below). It suffices if DC is applied for a short period (1-2 seconds). The remaining magnetism can be restored and
the generator can be started in the normal manner again.
ATTENTION! Before this procedure is performed to restore the
magnetic field, it is crucial to ensure that the generator is
not running! (otherwise, it is very DANGEROUS TO
LIFE!)