Fischer Panda 10000x, Manual

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Generator Failure
10.6.16 Kapitel/Chapter 8: Generator Failure - Seite/Page 121
8.6 Testing generator stator windings
8.6.1 Checking the generator voltage
In order to test, whether the fixed winding produces enough voltage, proceed in such a way:
1. Guarantee that the connection to the electrical system is interrupted.
2. Remove all conductions in the power terminal box of the generator.
3. Starter battery must be connected with the generator.
4. Start the generator start.
5. Measure with a voltmeter the voltage between the phase(s) and N. If the measured values are under the
substantially values in Table 9.4-5, “Voltage values stator coil,” on Page 130, a coil damage is to be accepted.
During the measurement in the 60 Hz version both partial coils must be interconnected, i.e. a connection must be
provided between line 1 and line 3. (see wiring diagram)
(notes: the voltage results from the remainder magnetism of the rotor, which induced a voltage in the coil.)
8.6.2 Measuring the coil resistance
For this a measuring instrument must be used that is
suitable for low impedance values.
• Adjust the measuring instrument to resistance test. If hold the poles of the measuring instrument hold together, 0.00
ohms should be indicated. If the poles are isolated, the display should indicate an overflow. Please implement this
test, in order to examine the equipment.
• Measure of the resistance within the individual windings.
If strong deviations in the individual coils are measured, must assumed that there is a coil short-circuit in a coil. This
leads to the fact that the generator does not excite itself any longer.
The actual values between the coils and ground are not to be determined exactly. It depends primarily on the fact
that the values of all three measurements are close to the same. Deviations among themselves refer to a coil short-
circuit. In this case the generator must be wound again by a specialist.
8.6.3 Checking the coil(s) to short-circuit
In order to check the coils for short-circuit, first all lines, which lead to the electrical system, must be interrupted. This
happens on the power terminal box of the generator or, if available, in the electrical system junction box. Guarantee
that no voltage lies at the lines, before they are interrupted (see “Discharge the capacitors” on Page 118.).
Now remove the bridge between „N“ and „PE“, so that coils and housing are electrically separate from each other.
Check with a circuit indicator (multimeter) in the power terminal box if between the individual connection points of the
coil and the housing (PE) a pass exists.