Troubleshooting: Electrical Control Operations

@writer: (confirmed 12/11/24) topic shared in Masterpact MTZ1 User Guide (DOCA0100), Masterpact MTZ2/3 User Guide (DOCA0101), and in the appendix in Masterpact MTZ End-user and Manufacturer Maintenance Procedures (DOCA0103 and DOCA0104). Any changes made will be made in all these guides.

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

Device Cannot be Closed by Using an External Pushbutton/Electrical Order

Symptom	Probable causes	Solutions
–	Device is padlocked or keylocked in the open position.	Unlock the device.
–	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 device 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 device 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 device 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 device 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 device is ready-to-close, send the closing order again via the XF closing voltage release.

Device 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.

Device 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.