SECTION 4 OPERATION
41
4.5.1 PROGRAM EDITING (continued)
FREQ: Any desired output frequency from 20.00 to 5000 Hz. may be entered.
Va, Vb, Vc: Line to neutral voltages are entered for 1Ф and 3Ф Forms. Line to Line voltages are entered
for 2Ф operation.
This defines the amplitude of the Power Source output,
Direct Coupled: 0 to 150 volts rms (Line-Neutral) in steps of 0.1 volts. Actual maximum
output voltage varies depending on the power source model, load, and
input voltage.
Transformer Coupled: 0 to 375 volts rms (TRANSFORMER RATIO= 0.1-2.5)
steps of 0.1 volts for ratios < 1.0
steps of 0.5 volts for ratios > 1.0
WFa, WFb, WFc: Select the desired output waveform. Waveform 1 is always a sine wave. Waveforms 2-
16 may be copied and/or edited as desired using the SETUP (fn) functions.
The UPC will attempt to generate the selected waveform at the rms voltage programmed. Because
of the Crest Factor (Vpeak/Vrms) of various waveforms the UPC may not be able to reproduce the
waveform at the voltage desired. If the waveform is peak-voltage-limiting, then selecting
transformer-coupled output with a higher ratio may solve this problem.
#SEGS (Not Editable):. Reports Number of Transient Segments defined in this Program (4.5.2).
Ilim / IprA / Iprt: This field allows entry of Programmable Current Limit (Ilim), Current Protect Level (IprA),
and Current Protect Time (Iprt).
In the Ilim display, programmable current limit can be set as desired. The range varies depending
upon which Power Source the UPC is controlling. One value is used for all three phases. This
function is average responding, RMS programmed.
When the CURRENT PROTECT feature is enabled (4.6.3.9), press the +/- key while the cursor is
on this field to toggle the display between IprA and Iprt. If the load current exceeds the set Current
Protect Level (IprA) for a time interval exceeding the protection delay setting (IprT), then the power
source will generate a fault condition and the output relay will open, disconnecting the load. The
UPC will display, “ERROR – CURRENT PROTECTION TRIGGERED”. Press either the CLEAR or
DISPLAY button to clear the fault before the UPC32 OUTPUT ENABLE switch will operate.
In the IprA display, set the Current Protect Level. This works similarly to the Ilim setting.
In the Iprt display, set the Current Protect Time as a value of 1-66635 where 1=100 mSec.
It is recommended that Current Limit (Ilim) be set to a value greater than Current Protect (IprA).
Setting current limit at or below current protect value will prevent Current Protect from operating.
PHb, PHc: Phase angle can be set from 0-359° for Phase B and Phase C, referenced to Phase A. Phase
A is always at 0°.
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