Fischer Panda 4000s PMS FC, Руководство пользователя

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Generator Failure
26.1.11 Panda_4000s_PMS_SCB_FCB_eng.R04 - Kapitel/Chapter 7: Generator Failure Seite/Page 117
deterioration of the capacitors.
7.5.3 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 votage between the phase(s) and N. If the measured values are under the substan-
tially values in Table 8.2.1, “Technical Data Generator 4000s SC + FC,” on Page 124, a coil damage is to be
accepted.
7.5.4 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 there are large deviations, it must be assumed that there is a windings short circuit. This also leads to non-excita-
tion of the generator.
The actual values between the windings parts and the earth cannot, however, be exactly determined. Fore-mostly,
the values of all three measurements must be the same, if possible. Deviations from each other show there is win-
dings short-circuit. In this case, the generator windings must be renewed by an electrician.
7.5.5 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 115“).
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.