Troubleshooting

Device padlocked or keylocked in the open position.

Disable the locking function.

Device not completely connected.

Terminate racking in (connection) of the device.

MX opening release permanently supplied with power.

There is an opening order. Determine the origin of the order. The order must be cancelled before the device can be closed.

MN undervoltage release not supplied with power.

There is an opening order. Determine the origin of the order.

Check the voltage and the supply circuit (U > 0.85 Un). If the problem persists, replace the release.

Permanent trip order in the presence of a MicroLogic P trip unit with minimum voltage and minimum frequency protection in Trip mode and the trip unit powered.

Disable these protection functions on the MicroLogic P trip unit.

Unexpected tripping.

MN undervoltage release supply voltage too low.

Check the voltage and the supply circuit (U > 0.85 Un).

Load-shedding order sent to the MX opening release by another device.

Check the overall load on the distribution system.

If necessary, modify the settings of devices in the installation.

Unnecessary opening order from the MX opening release.

Determine the origin of the order.

Device cannot be opened remotely, but can be opened locally.

Opening order not executed by the MN undervoltage release.

Drop in voltage insufficient or residual voltage (> 0.35 Un) across the terminals of the undervoltage release. If the problem persists, replace the MN release.

Device cannot be opened locally.

Operating mechanism malfunction or welded contacts.

Contact a Schneider Electric service centre.

Impossible to insert the racking handle in connected, test, or disconnected position.

A padlock or keylock is present on the chassis or a door interlock is present.

Disable the locking function.

Impossible to turn the racking handle.

The reset button has not been pressed.

Press the reset button.

Device cannot be removed from chassis (optional).

Device not in disconnected position.

Turn the racking handle until the device is in disconnected position and the reset button is out.

The rails are not completely out.

Pull the rails all the way out.

Device cannot be connected (racked in) (optional).

Chassis/device mismatch protection.

Check that the chassis corresponds with the device.

The safety shutters are locked.

Remove the lock(s).

The disconnecting-contact clusters are incorrectly positioned.

Reposition the clusters.

Chassis locked in disconnected position.

Disable the chassis locking function.

The device has not been sufficiently inserted in the chassis.

Insert the device completely so that it is engaged in the racking mechanism.

Device cannot be locked in disconnected position (optional).

The device is not in the right position.

Check the device position by making sure the reset button is out.

The racking handle is still in the chassis.

Remove the racking handle and store it.

Device cannot be locked in connected, test, or disconnected position.

Check that locking in any position is enabled.

Contact a Schneider Electric service centre.

The device is not in the right position.

Check the device position by making sure the reset button is out.

The racking handle is still in the chassis.

Remove the racking handle and store it.