ENSTROM 480B OPERATOR'S MANUAL 7-59
Rev. 15
Report No. 28-AC-023 Jul 12/10
7-60. Generator Caution Light
1. Anytime that the DC generator output voltage is
less than the battery voltage or the generator is OFF or
otherwise disconnected from the aircraft main bus, the
generator caution light, marked DC GEN on the caution
panel, will illuminate.
7-61. Controls and Indicators
1. Volt-Ammeter. The dual indicating volt-ammeter
(DC), located on the instrument panel, is a microprocessor
based indicator and indicates the main bus voltage (VOLT)
and the current load (AMP) being used. The indicator’s
microprocessor performs a power-on self-test when power
is connected to the indicator and also continuously
monitors “sensor reasonableness” (Refer to para. 7-28.9).
The microprocessor in the indicator will illuminate the LED
RED when the maximum operating limits are exceeded
(Refer to para. 7-76.2.c). The indicator is powered by the
aircraft 28-volt electrical system through the VOLT/AMP
circuit breaker.
2. Battery Switch. The BATT switch is located at the
top of the center pedestal panel. Battery electrical power is
supplied to the helicopter's electrical system when the
switch is in the ON position. When the switch is in the ON
position, it closes the circuit to the battery relay coil and
battery power is then connected to the main electrical bus.
When the switch is placed in the OFF position, it opens the
circuit to the battery relay coil and battery power is
disconnected from the main electrical bus.
3. Generator Switch. The generator switch, labeled
MAIN GEN, is located at the top of the center pedestal panel
to the left of the battery switch. In the ON position the
generator field is energized through the generator control
unit and 28-volt generator power is supplied through the
generator relay to the main electrical system bus. In the
OFF position, the generator is disconnected from the main
electrical bus.
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