Maintenance
Engine
100 9831/0650-3 100
Regulators
Figure 79.
V Voltage
The generator output must be checked under no load conditions, with the correct setting of frequency.
The voltage may be adjusted by +/- 5% of the nominal, by acting upon the voltage potentiometer on the
electronic regulators.
It is possible to get a remote voltage regulation of +/- 5% inserting in the proper terminals a 100k potentiometer
(for the six units) or a 100k potentiometer with a 100k resistance in series (for the 12 lead units).
Protections
The DSR is provided with an underspeed protection with an intervention threshold which can be adjusted by
the potentiometer marked `Hz'. This protection intervenes instantaneously by reducing the alternator voltage
to a safe value when frequency falls below 10% of the nominal value. This regulator also has inherent overload
protection which senses the exciter field voltage value. Should this field voltage value exceed the nominal
value for a period of more than 20 seconds, then again the alternator voltage is automatically reduced to a
safe operating level. This overload function has a built-in delay to allow for the overload when starting motors
(normally 5-10 seconds). The operating threshold of this protection device is adjustable by the potentiometer
marked `AMP'.
Figure 80.
A Amper B Hertz
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