Brake Sequence Fault

What does E.MB4 mean?

This fault indicates an error in the FR-A800's brake sequence control. This typically involves the timing and operation of an external mechanical brake, which is critical for holding the load and safe operation.

• Mechanical brake failure (e.g., brake not releasing, not engaging, worn pads).
• Incorrect wiring or malfunction of the brake control circuit (e.g., brake contactor, brake resistor).
• Improper timing or sequence settings for brake operation (e.g., Pr.1540-Pr.1543 for brake opening/closing timing).
• Insufficient torque from the motor to hold the load during brake transition.
• External fault in the brake feedback signal or safety interlock.

Click steps to track your progress.

1. 1

   Verify the wiring of the mechanical brake and its control circuit for correct connections and continuity.

2. 2

   Check the mechanical operation of the brake. Ensure it engages and releases smoothly and completely.

3. 3

   Review the brake sequence parameters in the FR-A800 (e.g., Pr.1540 Brake opening current detection level, Pr.1541-Pr.1543 for timing settings) and adjust them as needed.

4. 4

   Measure the current/voltage to the brake coil to ensure it is receiving the correct command.

5. 5

   Ensure the motor is capable of holding the load at zero speed before the brake releases and after it engages, if direct brake control is used.