Generator Failure
Seite 54 Panda PMS 8.000 NE - 42 NE Manual.R04 - Kapitel B: Generator Failure
8.7.08
B.4.5 Check the Windings for Short Circuiting
Ensure that the generator has been switched off and cannot be inadvertently switched on. Dis-
connect the wires to the battery for this.
1. All wires in the junction box or - if necessary - in the circuit distribution box must be disconnec-
ted. Ensure that the wires are no longer carrying an electrical current, before being disconnec-
ted (see “Discharging the Capacitors” on Page 51.)
2. Remove the Bridges between "N"and "PE", so that the windings and casing do not come into
electrical contact.
3. Make a check, by means of a Multimeter, as to whether there is a current between the indivi-
dual winding terminals and the casing (PE).
The contacts to measured are not relevant to
the type of generator (see type 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
The generator must be sent for a check to the factory or be re-winded locally, when a pass (beep)
should be detemined. Windings data can be requested for this, if it is necessary.
Fig. B.4.5-1: Generator type plate
B.4.6 Measuring the Inductive Resistance
An Ohm measurement of a winding does not always give reliable information concerning the
state of the winding. If there are resistance irregularities between the windings parts, this is a sure
sign that the winding is defective. This means the opposite cannot be concluded. This means a
winding can also be defective, if the resistance values between the windings parts do not show
great deviation.
Measurement of the inductive resistance gives a better reading. A Special measuring device is
necessary for this.
The inductivity is measured in the same manner as the resistance, i.e. the windings parts are
compared. The value of the inductive resistance is given in mH (milli Henry).
The correct values for the inductive resistance can be obtained from Table 4 on Page 110.
Note: The values are greatly dependent upon the measuring method (type of ohmmeter).
