Sorensen DCS Series 1kW and 1.2kW Supplies Maintenance and Troubleshooting
M362500-01 Rev K 4-3
Symptom Check Further Checks and Corrections
Output voltage
fluctuating or
regulation poor
Is unit at current limit? See Section 2.5.
Is input voltage within
specified range?
Measure voltage on input terminals.
See Section 1.4.
Are sense lines connected? See Section 2.6.4.
Is unit under remote analog
control?
See Section 2.11.
Internal circuit? Call Customer Service.
Output oscillating Long sense leads? See Section 2.6.4.
Inductance in load cables with
capacitive load?
See Section 2.6.3.
Internal circuit? Call Customer Service.
4.4 Calibration
Calibration is performed at the factory during testing. Recalibration should be performed
annually and following major repairs. Calibration should be done with the cover on, through
the access holes in the cover. See Figure 4-1 below. 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.
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
Note: Consult the factory for full calibration requirements.
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