Output Current Monitor Circuit Calibration - Xantrex XHR 7.5-130 Operating Manual

Calibration
Calibrating for Readback Accuracy
Output
1. Ensure that the power supply is turned OFF. Disconnect any load.
Current
2. Connect the shunt and DVM across the power supply output to read the output
Monitor
Circuit
3. Connect a second DVM to the rear panel J2 terminals 10 (output current
Calibration
4. Turn the current control fully counter-clockwise, then turn ON the power supply.
5. Set the supply output current to 1% of its model-rated output. See note below.
6. Adjust the output current monitor offset potentiometer (R81) until the monitor
7. Set the supply output current to the model-rated maximum output.
8. Adjust the output current monitor range potentiometer (R100) until the monitor
Repeat this adjustment until the monitor scale is within the product specifications as
found in Section 1, or to the accuracy that your application requires.
Notes:
•
•
•
82
current.
monitor) and 6 (program/monitor signal return). See notes below.
DVM indicates 1% of the readback scale. (50 mVdc for 0-5 V readback or
100 mVdc for 0-10 Vdc readback.)
DVM reads 100% of the readback scale. (5 Vdc for 0-5 V readback or 10 Vdc
for 0-10 Vdc readback.)
The recommended accuracy of the DVM and DC shunt-DVM combination is
four times better than your desired readback accuracy. The recommended
current ratings for the DC shunt and connecting wire is at least 10% greater than
the power supply's output current rating.
Depending on the readback accuracy required in your application, you may use
the front panel ammeter in place of the DC shunt-DVM combination.
Calculate the required output current reading using I = V/R where I is the
current, V is the DVM reading, and R is the DC shunt resistance.
Operating Manual for XHR Series Power Supply