Figure 2-8. Instrument Panel (400 Hz Electrical). (TS 6115-590-12/2-8)

TM 5-6115-590-12 Figure 2-8. Instrument Panel (400 Hz Electrical). (TS 6115-590-12/2-8). a. Frequency Meter. (1) Description. Dial pointer gauge, calibrated to indicate 388 to 412 hertz per second in 1/2 hertz per second increments. The dial scale has a red index mark at 400 hertz per second. (2) Purpose. To indicate the output frequency of the 400 Hz electrical system. (3) Indication. Normal indication is 400 Hz per second. b. AC Ammeter (1) Description. Dial pointer gauge, calibrated to indicate percent of rated current. The dial is calibrated from 0 to 125 percent in 5 percent increments. (2) Purpose. To indicate the line-to-neutral current as selected through the volt-amp select switch during operation of the power unit (3) Indication. Normal operating range Is 0 to 100 percent. Ammeter readings over 100 percent indicate an overload condition. c. AC Voltmeter (1) Description. Dial pointer gauge, calibrated to indicate 0 to 150 V AC m 5 volt increments. (2) Purpose. Indicates line-to-neutral voltages, as selected through the volt-amp select switch during operation of the power unit. (3) Indication. Normal operating indication Ls 120V AC, as determined by the position of the volt-amp select switch. d. Volt-Amp Select Switch. (1) Description. A four position rotary stitch. (2) Purpose. Connects the AC ammeter and AC voltmeter for selective monitoring of the line-to-neutral voltages and currents An OFF position is also provided to disconnect the ammeter and voltmeter. e. Output Contactor Switch. (1) Description. A three position toggle switch. (2) Purpose. In the momentary RESET position the switch actuates the 400 Hz output contactor to reset and close the output contacts connecting the 400 Hz electrical system to the external load. When released, the switch returns to the CLOSE position. In the OPEN position the switch actuates the contactor to open the output contacts and disconnect 2-10 Change 9