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OM-2065 / Operation and Maintenance Manual
90SB51 / Spec. 7015-3 / Frequency Converter
Physical
Weight (approximate, w/out mounting)
Width (front to back of unit)
Length
Height
Electrical
Input
Volts (AC Nominal)
Volts (AC Range)
Amperes (nominal input voltage/rated load)
Frequency (Hz)
Conductor Sizes Recommended *
Grounding Wire Sizes Recommended *
Output
Volts (AC) /Frequency (Hz)
Output Power Rating (kVA)
Amperes (at rated load)
Output Cable Sizes Recommended *
Power factor (PF)
Duty cycle (%)
Overload shutdown
Shorted output shutdown
*These sizes are taken from Tables 310-16 and 250-94, respectively, of the 1990 National Electrical Code,
for copper conductors rated at 75
and conform to your LOCAL electrical code, which may vary from the National Electrical Code.
2. Theory of Operation
This Hobart converter is a state-of-the-art, solid-state 60 (or 50) Hz to 400 Hz frequency converter. It
employs all silicon semi-conductors and CMOS digital logic. This converter is specifically designed to
supply clean, reliable ground power to an aircraft, eliminating the costly need for operating the aircraft's
auxiliary power unit. The block diagram in Figure 3 identifies major components of the system.
a. Input Rectifier
The input voltage is first rectified in a 3 phase bridge configuration and then filtered to provide an
unregulated DC voltage of approximately 600-V. This DC voltage feeds a three phase inverter
which transforms the DC input into a 400-Hz regulated output voltage. The inverter output
transformers provide electrical isolation between the input and output.
Nov 01/90
o
o
C (167
F). Before using conductors of the sizes above, however, refer to
Specifications and Capabilities
Figure 2
1570 lbs. (713 Kg)
46 inches (1168 mm)
60-1/8 inches (1527 mm)
19-9/16 inches (497 mm)
415
374 - 457
123
50
#1 AWG
#6 AWG
115/200V AC (wye), 400 Hz
90
260
2/0
0.8L
100%
125% for 5 minutes, 150% for 10 seconds
IMMEDIATE
Chapter 1-1
Page 3
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