Ametek Sorensen XFR 1200 Watt Series, Operation Manual

Page: 90 / 106

Calibration and Troubleshooting
5-8 TM-F1OP-C1XN-01
Output Current Monitor Circuit Calibration
To perform output current monitor circuit calibration:
1. Ensure that the power supply is turned OFF. Disconnect any load.
2. Set SW1 switch 6 OPEN to select 0-5 V output current monitor
range, CLOSED for 0-10 V.
3. Connect the shunt and DVM across the power supply output to read
the output current. Connect a second DVM between the rear panel J2
connector terminals 12 (output current monitor) and 11 (current
monitor signal return).
4. Turn the current control fully counter-clockwise, then turn on the
power supply.
5. Set the power supply’s output current to 1% of the model-rated
output. See Note.
6. Adjust the output current monitor offset (R394) until the monitor
DVM indicates 1% of the readback scale. (50 mVdc for 0-5 V
readback or 100 mVdc for 0-10 Vdc readback.)
7. Set the power supply output current to the model-rated output.
8. Adjust the output current monitor range (R383) until the monitor
DVM indicates 100% of the readback scale. (5 Vdc for 0-5 V
readback or 10 Vdc for 0-10 Vdc readback.)
Repeat this procedure until the monitor signal is adjusted to specifications
(see
“Specifications” ) or to the accuracy that your application requires.
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 8 Thursday, October 25, 2007 9:04 PM