Diagnosing Error Messages

This topic is present in the MTZ1 User Guide (Operations in Critical Cases) and MTZ2/3 User Guide (Operations in Critical Cases). Any changes made will be made in both these guides.

Diagnosis Sequence

The following table shows the sequence of actions to take after an error is detected by the MicroLogic X control unit. Further explanation of each action is given in the following paragraphs.

Step	Action
1	Identify the error detected.
2	Consult the list of error messages and perform the actions recommended.
3	Press OK to acknowledge the error and return to the Home menu.
4	Press the Test/Reset button for 3 seconds to reset the latched events.

Identifying the Error Detected

An error message is displayed when the MicroLogic X control unit detects an internal error.

Example of error screen:

Recommended Action After Detection of Errors

The following table indicates what action to perform according to the error message.

Code	Error message	Error description	Recommended action
1 to 24 157 190	Service not performed - internal error	The requested action has failed due to an internal error	Repeat the action that caused the error. If the message is displayed again, switch off the 24 Vdc of the MicroLogic X control unit and switch it on again. If the problem persists, call your Schneider Electric Services representative.
158	Command rejected, already in progress	The MicroLogic X control unit has detected simultaneous orders (for example between IO and control unit).	Repeat the command.
169	Command rejected, already in asked state.	The MicroLogic X control unit is already in the requested state.	Check that the MicroLogic X control unit is in the required state. If it is not, repeat the command.
174	Session Key is invalid	The request action has failed because the session key is not valid.	Repeat the action that caused the error. If the message is displayed again, switch off the 24 Vdc of the MicroLogic X control unit and switch it on again. If the problem persists, call your Schneider Electric Services representative.
175	Out of session scope	The requested action has failed because it is not within the session scope.	Repeat the action that caused the error. If the message is displayed again, switch off the 24 Vdc of the MicroLogic X control unit and switch it on again. If the problem persists, call your Schneider Electric Services representative.
176	Session is already opened	The MicroLogic X control unit has detected simultaneous settings sessions (for example, EcoStruxure Power Commission and control unit).	Press OK to clear the message and then repeat the command.
177	No session is open	Submit/apply operations have not been performed within five minutes.	Start a new session, re-enter the settings, then submit and apply them.
180	Bluetooth disabled! To enable go to Configuration menu.	Bluetooth Low Energy communication has not been enabled for the MicroLogic X control unit.	Enable Bluetooth Low Energy communication from the MicroLogic X control unit menu > Configuration > Communication > Bluetooth.

Contact your Schneider Electric Services representative for more information about who can carry out the recommended actions.