Pacific UPC-32 Operation Manual page 16

SECTION 1
1.3.1 UPC DESCRIPTION (cont'd)
The signal generation section produces one (UPC-12) or three (UPC-32) output signals representing the
output phase waveforms of the power source. The UPC controllers produce steady-state signals - a
base set of volts, frequency, waveforms and phase angle - and dynamic signals in which parameters
change with time.
microseconds to hours.
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Each signal can be any of the first 16 waveforms stored in memory.
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Waveform 1 is a sine wave and cannot be altered; the other 15 waveforms can be altered by the
user to produce any arbitrary wave function.
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The phase angle relation between the three output vectors may be varied.
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The amplitude of each vector may be varied together or independently.
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The frequency of all output vectors is the same and is controllable from 20 to 5000 Hz.
The Display of the UPC utilizes a 160 character Backlit LCD, which selectively meters operating
parameters or displays menus which interactively prompt the operator and assist in loading programs or
editing. On completion of any programming or editing function, the display automatically reverts to the
metering display.
Complete parameter metering is provided by the UPC. Output volts (line-to-line and line-to-neutral),
current (true RMS, peak, and crest factor), KVA, KW, and Power Factor can all be displayed. Frequency
is indicated based on the set value. Internal or External voltage metering sense points can be selected.
Internal metering displays the output voltage as metered at a point prior to the Output Relays. This
allows the output voltage to be checked prior to applying power to a load. External metering allows the
output voltage to be monitored at a remote point outside of the power source. With CSC enabled (see
below), external sense can be used to maintain an accurate voltage at any remote point, compensating
for line voltage drops.
The CSC (Continuous Self Calibration) feature provides automatic compensation for real losses due to
output transformers and distribution lines by maintaining an accurate COMMAND (program) voltage at
the metered sense point. CSC may be enabled or disabled at the user's discretion.
Externally referenced Metering calibration is simplified by internal software that allows external
measurements to be entered directly into the front panel or Remote Interface. Correction values
(kFactors) are then calculated and stored in the UPC's memory.
An output transformer ratio may be programmed into the UPC for controlling and metering voltages
outside of the power source direct coupled range.
A Programmable Current limit value can be set.
A unique feature available within the UPC is TRANSITION TIME. If Transition time is set to a non-zero
value, and a new program is executed, or changes are made in MANUAL MODE (or by REMOTE
CONTROL), the UPC will take the specified time to transition from the active voltage and frequency to
the new voltages and frequency. This feature may be used when it is undesirable to cause abrupt
changes to the output power signal. This feature does not affect transient operation. Transition time may
be set from 0 to 300 seconds in increments as small as 200 uS.
Waveform analysis functions can be optionally provided to report both magnitude and phase angle of
each harmonic for metered voltage and current waveforms. THD, ODD and EVEN harmonic distortion
measurement data is also reported.
GENERAL
Dynamically the signal generator can produce transient events lasting from
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