Xantrex XKW 12-150, Operating Manual

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Calibration
Calibrating for Programming Accuracy
Revision A
85
Current
Readback
Calibration
Table 4.4
Current Readback Calibration
Repeat this procedure until the monitor scale is adjusted to the desired accuracy.
Notes:
1. 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.
Calculate the required DVM reading using V=I x R where V is the DVM reading,
I is the current, and R is the DC shunt resistance.
Function & Designation
of multiturn trim pots
Step Action
Output Current Monitor
1 Disconnect any load. Connect a shunt and DVM across the power
supply output to read the output current. Connect a second DVM to the
rear panel J3 output current monitor terminals. [J3-7 (Pos.) and J3-12
(Neg.)]. See Note 1.
Offset (R23) 2 Set the supply output current to 1% of its rated output current.
See Note 2.
3 Adjust R23 until the monitor DVM indicates 1% of the readback scale.
Example: 0.75A for 40V Model.
Output Current Monitor 1 Set the supply output current to 100% of its rated value.
Range (R24) 2 Adjust R24 until the monitor DVM indicates 100% of the readback
scale. Example: 75A for 40V Model.
TM-25OP-01XN.book Page 85 Monday, April 5, 2004 8:58 AM