Emergency ramp failed

What does 73B0 mean?

The motor has not stopped within the maximum allowed time after an emergency stop command (Off1 or Off3 mode) was issued. This indicates a failure in the emergency braking sequence, which could lead to unsafe operation if the system cannot stop as expected. The drive trips and coasts to a stop.

• Mechanical binding or excessive load on the motor shaft preventing it from decelerating within the programmed time.
• Motor brake not engaging or failing to provide sufficient torque to stop the motor quickly (e.g., brake pads worn, spring fatigued).
• Deceleration time parameter (e.g., P2-11 'Deceleration time 1') is set too long for the required emergency stop duration.
• Motor current or torque limits (e.g., P1-54 'Motor current limit') are set too low, preventing sufficient braking torque during deceleration.
• Failure of the drive's internal braking chopper or external braking resistor (if installed) to dissipate regenerative energy.

Click steps to track your progress.

1. 1

   1. Disconnect the motor from the mechanical load and manually attempt to rotate the shaft to check for binding or excessive friction.

2. 2

   2. Verify the motor brake functionality by applying a separate 24VDC (or appropriate voltage) to the brake coils and observing full engagement.

3. 3

   3. Reduce the deceleration time parameter (e.g., P2-11) by 10-20% increments and re-test the emergency ramp function, ensuring the mechanical system can handle it.

4. 4

   4. Monitor the motor's actual braking current during an emergency stop attempt using parameter P1-02 to ensure it reaches sufficient levels.

5. 5

   5. Inspect the braking resistor for damage or overheating and measure its resistance value to confirm it is within specified limits.