Allen-Bradley 2198-H040-A-T

Common Fault Codes

Fault Code: Bus Overvoltage

The DC bus voltage has exceeded the allowable maximum threshold, typically caused by excessive regenerative energy or an overvoltage condition on the AC input.
Check AC input voltage levels for overvoltage conditions. Verify that regenerative energy is being managed correctly across the shared bus. Consider adding a shunt resistor module if regenerative loads are excessive.

Fault Code: Bus Undervoltage

The DC bus voltage has dropped below the minimum operating threshold, which may indicate a loss of AC input phase, low input voltage, or an overloaded bus.
Verify all three AC input phases are present and within specification. Check input fusing and contactors. Reduce load on the DC bus if overloading is suspected.

Fault Code: Precharge Failure

The DC bus failed to precharge to the required voltage level within the expected time window during power-up.
Inspect the precharge circuit and associated resistors for damage. Check AC input voltage and verify that no short circuit exists on the DC bus. Inspect bus capacitors on connected axis modules.

Fault Code: Input Phase Loss

One or more of the three AC input phases has been lost or has dropped below acceptable voltage levels.
Check all three input phases at the power supply terminals. Inspect upstream fusing, circuit breakers, and contactors. Restore balanced three-phase input power.

Fault Code: Overtemperature

The internal temperature of the power supply module has exceeded the safe operating limit, typically due to inadequate cooling or excessive ambient temperature.
Verify that the enclosure cooling system (fans, heat exchangers) is functioning correctly. Check that ambient temperature is within the 0-50 degrees C specification. Ensure adequate airflow clearances around the module.

Fault Code: STO Fault

A Safe Torque Off fault has been detected, indicating that the STO safety input has been de-energized unexpectedly or that there is a wiring fault in the safety circuit.
Inspect the STO wiring and safety relay circuit for open circuits or incorrect wiring. Verify that the safety system is commanding STO intentionally. Reset the fault after correcting the safety circuit condition.

Fault Code: Hardware Fault

An internal hardware fault has been detected within the power supply module, which may indicate a component failure or firmware issue.
Cycle power to the module and observe if the fault clears. If the fault persists, check firmware version compatibility with the connected controller. If hardware damage is confirmed, the module will require repair or replacement.