Quick answer: CC operation can be normal current limiting rather than a fault. Unexpected shutdown, overheating or voltage collapse calls for output-off checks of the load, ratings and documented protection behaviour; internal repair belongs with qualified service.
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Is it overload or expected CC operation?
For a resistive load, expected current is I = V/R. A 10V setting across 5Ω implies 2A. If the current limit is 1A, an ideal resistive example enters CC operation near 5V. That reduced voltage is a consequence of the selected limit, not proof of internal damage. Actual DUT startup and nonlinear behaviour can differ.
Output-off diagnostic sequence
- Read the mode, error and protection indication; record the instrument settings.
- Disable output and follow the discharge procedure.
- Check whether the required operating point exceeds voltage, current or power ratings.
- Inspect external wiring and the load for a short or incompatible connection using appropriate safe methods.
- Check ventilation and the operating environment. Restart only using the model’s prescribed procedure.
Protection and reset behaviour
Current limiting, latched OCP, overload shutdown and temperature protection are distinct behaviours. Read the exact manual; do not bypass protection or repeatedly reset a unit without finding the cause. Increasing the current limit is appropriate only after confirming that the load, supply and connections permit it.
When to request service
Stop using a unit with damaged connectors, abnormal smell, visible damage or persistent unexplained faults. Provide the model, settings, error messages, load conditions and observed behaviour to qualified service. Opening a supply can expose hazardous voltage and stored energy.
Practical checks
| Check | What to verify |
|---|---|
| Mode | Identify CV/CC, protection indicator and logged error. |
| Load | Check required power and possible short circuits with output disabled. |
| Installation | Inspect external connections and ventilation safely. |
| Escalation | Stop using damaged equipment and request qualified service. |
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