MAINTENANCE SORENSEN DCS SERIES MANUAL
4-2
4.3.2 Internal Troubleshooting
After reading the caution in Section 4.3 and completing the preliminary checks described in Section 4.3.1, remove
the cover and proceed with internal troubleshooting using the information contained in Figure 4-1 as a guide to
isolate the problem to a specific area of the circuit. Refer to the schematics in Section 6 and the theory of
operation in Section 3 for additional information.
4.4 Calibration
Calibration on both the A1 and A2 assemblies is accomplished using multiturn trimpots. The list below gives the
circuit designation of the trimpot and the parameter affected by that part. Calibration is performed at the factory
during testing and recalibration should be unnecessary unless major repairs are required. Calibration should be
done with the cover on through the access holes in the cover. See Figure 4-2 below.
CIRCUIT DESIGNATION ASSEMBLY PARAMETER AFFECTED
R7 A2 Output Current Monitor Calibration
R46 A2 Output Current Monitor Offset
R47 A2 Current Control Circuit Offset
R48 A2 Output Current Range
R52 A2 Voltage Control Circuit Offset
R53 A2 Output Voltage Range
R18 A1 Front Panel Voltmeter Calibration
R15 A1 Front Panel Ammeter Calibration
R8 M15 Option Board Program Range Adjust
R11 M15 Option Board Program Offset Adjust
NOTE: Consult the factory for full calibration requirements.
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