Electrical Power Supply System Indicators
A dual indicating AC voltmeter [22, fig. 5-1], on the instrument panel, shows No. 1 and No. 2 generator voltages. The instrument has a range of 0 to 250 volts, graduated in increments of 20 volts. The voltmeter reads line-to-line, rather than line-to-neutral or line-to-ground. Thus, the reading under normal conditions should be 200 volts and would check availability of two phases rather than only one phase.
When both primary AC busses are energized by one generator or by external power, both pointers should indicate the same voltage. If either generator fails, both pointers will show the output of the remaining generator.
Whenever the No. 1 generator drops "off the line", the amber No. 1 generator-out caution light [20, fig. 5-1], on the instrument panel, comes on and reads "GEN OUT". The light is powered by the 28-volt primary DC bus.
Whenever the No. 2 generator drops "off the line", the amber No. 2 generator-out caution light [25, fig. 5-1], on the instrument panel, comes on and reads "GEN OUT". The light is powered by the 28-volt primary DC bus.
The DC voltmeter [12, fig. 5-3], on the center pedestal, has a range of 0 to 30 volts, graduated in increments of one volt. This voltmeter will indicate either primary DC bus or strain gauge power voltage. The voltage reading selection is through the DC voltmeter switch [13, fig. 5-3].
Note: Strain gauges (and sensors) are not simulated in this software version. However, the DC voltmeter will indicate 24 volts when the DC voltmeter switch is at STRAIN GAGE, indicating a normal strain gauge circuit.
See also:
Electrical Power Supply Controls