KEPCO JQE 150-1.5MVPY-26956 Half Rack - Manual (Page 38)

4-4 JQE SPECIAL 081111
3. Adjust FS LOC potentiometer (accessible through top cover) until output voltage reads
E
Onom
(V) (tolerance ±0.1% of E
Onom
).
4.5.5 REMOTE FULL SCALE (FS) OUTPUT VOLTAGE CALIBRATION
1. Turn the JQE special power supply off.
2. Remove the link between terminals RVC and RPV1 of TB501 at the rear panel.
3. Connect the fixed External Programming resistor (see PAR. 4.2) between terminals RPV1
and RPV2 of TB501 at the rear panel. The resistor value should be E
Onom
(Volts)/1mA in
KOhms, tolerance: 0.01%
4. Set the E
OUT
LOC-REM switch (accessible through top cover) to REM position (towards
the back panel)
5. Turn the unit on and adjust E
OUT
FS REM potentiometer (accessible through top cover)
until output voltage reads E
Onom
(V) (tolerance ±0.1% of E
Onom
).
4.6 OUTPUT CURRENT LIMIT CALIBRATION
Output current limit calibration consists of the following procedures: Pre-Calibration setup (PAR.
4.6.1), Zero (Minimum) Output Current Limit "B" (PAR. 4.6.2), Full Scale (maximum) Output
Current Limit "B" (PAR. 4.6.3), Full Scale Current Monitor (PAR. 4.6.4), Full Scale Output Cur-
rent Limit "A" (PAR. 4.6.5).
4.6.1 CURRENT LIMIT PRE-CALIBRATION SETUP
1. Current measurements are made by measuring the voltage drop across the sense resistor
(see PAR. 4.2) and then converting the result to current using the following formula. It is
critical that the actual value of the sense resistor be measured accurately.
R
SENSE
= the measured value of the sense resistor in ohms (0.01% accuracy).
Calculated output current [Amperes] = ( V
DVM [Volts])/
R
SENSE [Ohms]
2. Turn the JQE special power supply off and, if connected, remove the external remote pro-
gramming resistor from terminals RPV1 and RPV2 of TB501.
3. Install link between terminals RVC and RPV1 of TB501.
4. Set the E
OUT
LOC-REM switch (accessible through top cover) to LOC position (towards the
front panel).
5. Turn front panel I
lim
"A" control to the full clockwise position.
6. Turn front panel I
lim
"B" controls to the full counterclockwise position.
7. Turn front panel VOLTAGE control to the full clockwise position.
8. Connect precision 4-terminals Current Sensing Resistor (Shunt) (see PAR 4.2) across the
output, between terminals +V and –V of TB501 at the rear panel.
9. Connect the DVM to the Shunt's sensing terminals with the DVM reference terminal con-
nected to the terminal closest to the –V terminal on TB501. Use the Shunt measured value
to correct the Output Current DVM readings.