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OM-2065 / Operation and Maintenance Manual
90SB51 / Spec. 7015-3 / Frequency Converter
Section 3. Operation
1. Start-Up Procedure with No Load on Converter Unit
a. Apply rated input power to the converter unit from the input power (disconnecting means). The
green INPUT POWER indicating light on control panel will come on. Check that the three green
lights on ALARM III are ON. (See Section 1-1, Fig. 4 for location of cards in card cage).
b. Check functioning of all alarm indicators by putting the TEST/RESET switch first in the TEST (UP)
position and then in the RESET (DOWN) position.
c. Place the NORMAL/MAINT switch on the amplifier (AMP) card in the MAINT (DOWN) position. The
red indicator light just below the switch should glow.
d. Push the START button on the front panel. The green OUTPUT POWER indicating light should glow.
Output voltage should be indicated on the OUTPUT VOLTAGE meter when the PHASE SELECTOR
SWITCH (below the voltmeter) is in position (phase) 1, 2, or 3.
e. Adjust output voltage as necessary for 115/200 V-AC power delivery. Adjustments of output voltage
may be made with the VOLTAGE potentiometer located on the amplifier (AMP) card. Readings on
the OUTPUT VOLTAGE meter may be verified for accuracy by connecting the leads of a master
voltmeter into the test jacks marked OUTPUT and located next to the OUTPUT VOLTAGE meter.
2. Start-Up Procedure with Converter Unit Connected to an Aircraft
a. With rated input power applied to the converter, check that the three green lights on ALARM III are
ON and that the green INPUT POWER light is ON at the control panel.
b. Check the functioning of all alarms by putting the TEST/RESET switch in the TEST (UP) position and
then in the RESET (DOWN) position.
c. Place the NORMAL/MAINT switch on the AMP card in the NORMAL (UP) position.
d. Push the START button and keep it depressed for approximately one second. If the converter is
connected to an aircraft, a 28-V DC interlock signal will be fed back to the converter to latch a relay
and allow the converter to operate as long as the power output cable is plugged into the aircraft.
If the cable is removed from the aircraft, the converter will shut off.
WARNING
3. Door interlock switch
This unit is equipped with door interlock switches, S1 on the front door and S2 on the back door.
Opening either door will cause input circuit breaker to trip and disable the unit. Therefore BOTH doors
have to be closed to operate the unit. This feature is included with the unit for safety of the operator.
4. Turn-Off Procedure
To turn the unit off, depress the STOP button on the control panel. The green OUTPUT POWER
indicating light will shut off, and the OUPUT VOLTAGE meter will indicate zero (0) volts.
NOTE: The red fault indicator will light momentarily when the stop button is pushed. This is normal.
Nov 01/90
Care must be taken not to bypass the door interlock switches as possibe
hazardous shock could occur.
Chapter 1-3
Page 1
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