This manual describes the Elgar Model 751SL, 1001SL and
1751SL power sources. The series of power sources though
functionally equivalent to previously available units,
exhibit several notable improvements. Marked reductions in
panel height, overall weight, and volume have been achieved.
Also, provision has been made in each unit for incorporation
of custom functions without resorting to special designs.
Each power source described herein provides AC power at
precise frequencies for testing, motor operation, and
frequency conversion. The basic power amplifier consists of
two DC supplies and a direct coupled amplifier driving a
tapped output transformer. Nominal output voltage for each
of the units is: 0-65, 0-130,
0-260 VAC. Output power at full and at less than full rated
voltage is illustrated in the derating chart of Figure 1-1.
Figure 1-2 illustrates a typical harmonic distortion curve.
Each power source may be wired for 115, 208 or 230V input,
47-63 Hz single phase.
1.1.2 Output voltage and frequency are established by a
Output frequency range for these units is 45 Hz to 5kHz.
1.1.3 Equipment tests to meet military specification
operating requirements over the frequency range of 47 to 63
Hz or 47 to 425 Hz are facilitated through the use of Elgar
power sources. The basic power source output is single
phase, however, multiphase power may be obtained by stacking
two or three power sources, all driven by one multiphase
plug-in oscillator. See Section III.
1.1.4 Each power source is contained in a standard rack
mountable enclosure. A meter for output voltage monitoring,
a power on indicator lamp, a voltage amplitude control and a
power circuit breaker that applies line power to the unit
are located on the front panel. Cooling air for the power
amplifier is drawn through a side panel grills and exhausted
at the rear of the enclosure.
1.1.5 The enclosure contains heatsink assemblies which
comprise a two section power amplifier. Control circuitry is
mounted on a plug-in circuit board with test points and an
adjustment control for output voltage regulation. Output
voltage monitoring is available at the rear panel terminal
block and at front panel binding posts.