Code

Name

Causes

Possible Solutions

CE

Modbus Communication Error

The communications cable wiring is incorrect.

Correct wiring errors.

There is a short circuit in the communications cable or the communications cable is not connected.

  • Repair short circuits and connect cables.

  • Replace the defective communications cable.

Electrical interference caused a communication data error.

  • Examine the control circuit lines, main circuit lines, and ground wiring, and decrease the effects of electrical interference.

  • Make sure that a magnetic contactor is not the source of the electrical interference, then use a Surge Protective Device if necessary.

  • Use only the recommended cables or other shielded line. Ground the shield on the controller side or the drive input power side.

  • Separate the communication wiring from drive power lines, and install a noise filter to the input side of the power supply for communication.

  • Decrease the effects of electrical interference from the controller.

The communication protocol is not compatible.

  • Examine the values set in H5-xx.

  • Examine the settings on the controller side and correct the difference in communication conditions.

The value set in H5-09 [CE Detection Time] is too small for the communications cycle.

  • Change the controller software settings.

  • Increase the value set in H5-09.

The controller software or hardware is causing a communication problem.

Examine the controller and remove the cause of the problem.
Note:

  • The drive detects this error if it does not correctly receive control data for the CE detection time set to H5-09.

  • If the drive detects this error, the terminal assigned to H2-01 to H2-04 = 10 [MFDO Function Select = Alarm] will activate.

  • If the drive detects this error, it will operate the motor as specified by the stopping method set in H5-04 [Communication Error Stop Method].