Troubleshooting
In normal solar array operation, the front panel status annunciator reports CC (constant-current)
status. If the solar array curve operates outside the normal operating boundaries, the front panel
status annunciator reports either VL+ (positive voltage limit) or CL- (negative current limit) status.
Most SAS errors involve curve and table parameters being outside of the acceptable parameter limits.
For example:
Error 335, VMP must be less than VOC
Other errors can occur if the VMP or IMP is less than the allowable range of values, if the computed (or
true) VOC exceeds the maximum voltage setting of the instrument, or if the slope of the curve is
greater than the allowable maximum dI/dV of 4.154.
Error 339, VMP and/or IMP too small
Error 315, Settings conflict error; dI/dV is <calculated value>, maximum is 4.154
If oscillations occur when using the DCDC20uF compensation range, verify that you are using a
minimum capacitance of 20uF on the input to the DUT. Also verify that you are using the remote sense
inputs. The sense inputs must be attached as closely as possible to the >=20uF capacitor.
Model Equations
The following equations describe the solar array simulator space model using the parameters Rs, N,
and a, which are defined as functions of the four input parameters Voc, Vmp, Isc, and Imp. See Note 1.
Note 1
This model is described in the paper: Britton, Lunscher, and Tanju, "A 9 KW High-Performance Solar Array Simulator",
Proceedings of the European Space Power Conference, August 1993 (ESA WPP-054, August 1993)
4 Using the Modular Power System
84 Keysight MP4300 Series Operating and Service Guide
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