Sorensen DCS300-4E - 4.4 Calibration

Sorensen DCS Series 1kW and 1.2kW Supplies Maintenance and Troubleshooting
M362500-01 Rev H 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.