Troubleshooting: Electrical Control Operations

Definition

Electrical control operations are operations that are made by an electrical order through a voltage release or by an external pushbutton that is directly connected to a voltage release.

Troubleshooting Voltage Releases

Troubleshooting depends on the type of voltage release, as follows:

For communicating voltage releases, consult the MicroLogic Active event messages and then refer to MasterPacT MTZ Critical Cases.
For standard or reinforced voltage releases, follow the troubleshooting instructions given in the following tables. If the problem persists, replace the voltage release.

Circuit Breaker Cannot be Closed by Using an External Pushbutton/Electrical Order

Symptom	Probable causes	Solutions
–	Circuit breaker is padlocked or keylocked in the open position.	Unlock the circuit breaker.
–	Electrical closing order not executed by the XF closing voltage release due to insufficient voltage power supply.	Check the voltage and the XF supply circuit (0.85–1.1 Un). If the problem persists, replace the XF closing voltage release.
The closing spring and ready-to-close indicator shows that the mechanism is charged but the circuit breaker is not ready to close.	MX opening voltage release is permanently powered.	As there is an opening order, determine the origin of the order. The order must be canceled before the circuit breaker can be closed.
	MN undervoltage release is not powered due to an opening order.	As there is an opening order, determine the origin of the order. The order must be canceled before the circuit breaker can be closed.
	MN undervoltage release is not powered due to insufficient voltage power supply.	Check the voltage and the MN supply circuit (V > 0.85 Un). If the problem persists, replace the MN undervoltage release.
–	XF closing voltage release is continuously supplied, but circuit breaker was not ready-to-close when the closing order was sent (XF closing voltage release is not wired in series with PF ready-to-close contact).	Remove the power supply to the XF closing voltage release. Only if the circuit breaker is ready-to-close, send the closing order again via the XF closing voltage release.

Circuit Breaker Cannot be Opened by Using an External Pushbutton/Electrical Order

Probable causes	Solutions
Opening order is not executed by the MN undervoltage release.	Drop in voltage insufficient or residual voltage (V > 0.35 Un) across the terminals of the MN undervoltage release. If the problem persists, replace the MN undervoltage release.
Opening order is not executed by the MX opening voltage release.	Check the voltage and the MX supply circuit (0.7–1.1 Un). If the problem persists, replace the MX opening voltage release.

Probable causes

Solutions

Opening order is not executed by the MN undervoltage release.

Drop in voltage insufficient or residual voltage (V > 0.35 Un) across the terminals of the MN undervoltage release.

If the problem persists, replace the MN undervoltage release.

Opening order is not executed by the MX opening voltage release.

Check the voltage and the MX supply circuit (0.7–1.1 Un).

If the problem persists, replace the MX opening voltage release.

Circuit Breaker Cannot be Reset by Using RES Electrical Remote Reset

Symptom	Probable causes	Solutions
The blue fault-trip reset button is popped out.	Insufficient supply voltage for the RES electrical remote reset.	Check the voltage and the RES supply circuit (0.7–1.1 Un). If the problem persists, replace the RES electrical remote reset.

Symptom

Probable causes

Solutions

The blue fault-trip reset button is popped out.

Insufficient supply voltage for the RES electrical remote reset.

Check the voltage and the RES supply circuit (0.7–1.1 Un).

If the problem persists, replace the RES electrical remote reset.

Additional Checks

If the troubleshooting actions described above do not work, refer to the troubleshooting information for Mechanical Control Operations.