Servicing Sorensen DCS Series 3kW Supplies
6.2.2
6.2.3
6.2.4
6.3
Servicing Precautions
Always disconnect power, discharge circuits, and remove external voltage sources before
making internal adjustments or replacing components. When performing internal adjustments or
servicing the power supply, ensure another person with first aid and resuscitation certification is
present. Repairs must be made by experienced technical personnel only.
Be sure to isolate the power supply from the input line with an isolation transformer when using
grounded test equipment, such as an oscilloscope, in the power circuit.
Parts Replacement and Repairs
Parts lists are in Section 6.4 Replaceable Parts. Do not use substitute parts or make any
unauthorized modifications to the power supply to ensure that its safety features are not
degraded.
Unusual or Erratic Operation
If the power supply displays any unusual or erratic operation, follow these steps:
•
Shut the power supply off immediately.
•
Disconnect it from the AC power source.
•
Check all load, programming, and monitoring connections and circuits.
•
Check the AC input for correct voltage and frequency.
•
Correct any problems found.
•
Retest the system. (See Section 2.6 Initial Functional Tests.)
If the problem is not solved after following this procedure, or if the unit fails to operate correctly
upon retesting, call the manufacturer.
Calibrating for Programming Accuracy
The offset and range of the voltage and current programming circuits are calibrated for default
0-5 Vdc programming signals at the factory. Recalibration should be performed annually, and
may be necessary when you use custom 0-10 Vdc programming or when you switch back to 0-5
Vdc programming after previously calibrating for 0-10 Vdc programming.
WARNING
The calibration procedures are performed with the power supply cover off and
the power on. To prevent personal injury, read Section 2.2 Safety and follow the
procedures for removing and replacing the cover in Section 4.2.3. Use a non-
conducting, straight blade adjusting tool for regulating the multiturn trim pots.
6-2 Operation Manual
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