KEPCO JQE 150-1.5MVPY-26956 Half Rack - Manual (Page 36)

4-2 JQE SPECIAL 081111
2. Turn OVP DELAY ADJ potentiometer (accessible through top cover) to approximately the
middle position (five turns from one end).
3. Slowly, turn the OVP ADJ potentiometer counterclockwise until the power supply circuit
breaker trips OFF. Then turn OVP ADJ potentiometer clockwise 1/4 turn.
4. Turn on the JQE special power supply. The circuit breaker should not trip and the output
voltage, measured by either the front panel voltmeter or by the external DVM, should the
same as step 1 above.
NOTE: The OVP circuit causes the circuit breaker to trip and initiates the Output Crowbar, a
solid state switch (thyristor) across the output. Adjust OVP DELAY ADJ potentiometer
so that the circuit breaker does not trip while the unit is operating with your particular
load and application. To avoid tripping the circuit breaker unnecessarily, for example
upon encountering load transients, a compromise must be made between the follow-
ing:
• Rapid OVP action (minimum tolerance for output overvoltage):
OVP DELAY ADJ set to full counterclockwise position and
• Maximum delay of OVP action (where some overvoltage is acceptable):
OVP DELAY ADJ set to full clockwise position.
5. Repeat steps 1 through 4 above for any desired operational output voltage above 5%
E
Onom
.
4.5 OUTPUT VOLTAGE CALIBRATION
The output voltage calibration consists of the following calibration procedures which must all be
performed in sequence: Pre-calibration Setup (PAR 4.5.1), Zero Output Voltage (PAR 4.5.2),
Zero Current Monitor (PAR 4.5.3), Local Full Scale (FS) Output Voltage (PAR 4.5.4), and
Remote Full Scale (FS) Output Voltage (PAR 4.5.5).
4.5.1 VOLTAGE PRE-CALIBRATION SETUP
Turn the power supply off and verify the following:
1. At the rear panel links between -S and -V, +S and +V, RVC and RPV1 on TB501 and
between REF and RPC1 of TB502 are installed and securely tightened
2. Set the E
OUT
LOC-REM switch (accessible through top cover) to LOC position (towards the
front panel).
3. Turn front panel I
lim
"A" and I
lim
"B" controls to the full clockwise position.
4. Turn front panel VOLTAGE control to the full counterclockwise position.
4.5.2 ZERO OUTPUT VOLTAGE CALIBRATION
Zero Output voltage is calibrated for either the local front panel VOLTAGE control (PAR 4.5.2.1)
or an external resistance used for remote programming of output voltage (4.5.2.2).