KEPCO EL Series Electronic Load Operator Manual P/N 243-1295 Firmware Version 4.00 to 4.xx - Manual (Page 61)

SERIES EL 071414
3-25
3.15.2 RAMP INTERACTIONS
• If the INPT ramp is in use, and POS and/or NEG ramps are also used, the actual INPT
ramp will the larger of the values programmed for INPT, POS and NEG.
When using both ramps and transients at the same time, the following must be observed
(see Figure B-1 for timing, see PAR. B.100 to initiate a transient pulse.):
• Transient must be greater than set point if POS ramp and NEG ramp times are
different.
• Transient pulse period must exceed POS ramp time by at least 1 millisecond.
• Transient must be greater than (POS ramp time + NEG ramp time + 0.002)
• To configure Transient see PAR. B.30 for conductance, PAR. B.38 for current, PAR. B.50
for resistance and PAR. B.62 for voltage.
• Programming minimum input voltage (PAR. 3.16) to any value will disable the output and
reduce overshoot at the start of the INPT ramp.
3.15.3 ACCESSING RAMPS FROM THE FRONT PANEL
1. With the load disengaged (LOAD pushbutton indicator steady green) press the LOAD push-
button to engage the load (LOAD pushbutton indicator goes from green to amber).
2. Push and hold for CONTROL knob for three seconds, until the LOAD pushbutton indicator
starts blinking alternately green and amber, then release CONTROL knob.
3. Rotate CONTROL knob to select OFF mode (CI, CR, CV and CP indicators are all off), then
tap the LOAD pushbutton. The LOAD pushbutton indicator blinks alternately green and off.
4. Rotate CONTROL knob until (RAMP) is shown in AMPS display, VOLTS display
shows the Positive Ramp value and KW display shows the Negative Ramp value.
5. To change Ramp values, tap CONTROL knob. VOLTS display shows (POS) and
KW display shows the positive ramp value with one digit blinking.
6. Rotate CONTROL knob to change value. Tap CONTROL knob to move to the next digit.
Once the desired value for POS ramp is displayed, continue to tap until VOLTS display
shows
(NEG) and KW display shows the negative ramp value with one digit
blinking.
7. Rotate CONTROL knob to change value. Tap CONTROL knob to move to the next digit.
Once the desired value for POS ramp is displayed, continue to tap until VOLTS display
shows
(INPT) and KW display shows the input ramp value with one digit blinking.
8. Rotate CONTROL knob to change value. Tap CONTROL knob to move to the next digit.
Once the desired value for input ramp is displayed, continue to tap until AMPS display no
longer shows
(RAMP).
9. Tap the LOAD pushbutton to exit the menu (LOAD pushbutton changes to steady green) and
returns to OFF mode.