Ametek Sorensen XFR 1200 Watt Series, Operation Manual

Page: 88 / 106

Calibration and Troubleshooting
5-6 TM-F1OP-C1XN-01
Current Limit Programming Circuit Calibration
To perform current limit programming circuit calibration:
1. Ensure that the power supply is turned OFF. Disconnect any load.
2. Connect the program source between J2 connector terminals 8
(output current limit programming input) and 7 (current program
signal return).
3. Connect the shunt and DVM across the power supply output.
4. Turn the power supply ON.
5. Apply 1% of program voltage.
6. Adjust the current limit program offset (R469) until the shunt/DVM
indicates 1% of the model-rated output current. See Note.
7. Apply 100% of program voltage.
8. Adjust the current limit program range (R459) until the shunt/DVM
indicates the model-rated output current. See Note.
Repeat this procedure until output levels are adjusted to specifications
(see
“Specifications” ) or to the accuracy that your application requires.
Calibrating for Readback Accuracy
The factory calibrates the offset and range of the output voltage and
current monitor circuits to within 1% for the default 0-10 Vdc scales. You
may need to recalibrate when you select the 0-5 Vdc scale or when you
switch back to the 0-10 Vdc scale after previously calibrating for 0-5 Vdc
operation.
See “Calibration Setup” on page 5–2 for the procedures to remove the
cover and any option card. Follow all procedure steps in the sequence
given.
Important:
Calculate the required DVM reading using V= IR where V is the
DVM reading, I is the current, and R is the DC shunt resistance.
TM-F1OP-C1XN-01.book Page 6 Thursday, October 25, 2007 9:04 PM