Ramp timeout

What does F-34 mean?

The drive has exceeded its set stop ramp time, meaning it took longer than programmed to decelerate and come to a stop. This fault triggers an immediate switch-off with inhibit, often due to insufficient ramp time settings relative to the load or braking capability. This can result in poor control and mechanical stress if not corrected.

• Deceleration ramp time (Parameter P1-13) set too short for the inertia of the connected mechanical load, making physical deceleration impossible within the timeframe.
• Insufficient braking torque available from the motor or an external braking resistor (Parameter P2-22, Brake resistor resistance) that is too high or disconnected.
• Mechanical binding or excessive friction in the load (e.g., conveyor belt jammed, gearbox fault) preventing smooth deceleration.
• Incorrect motor data (e.g., P1-01, Motor rated power; P1-02, Motor rated frequency) entered into the drive, leading to miscalculation of braking capacity.
• Regenerative energy from the load exceeding the drive's or braking resistor's dissipation capacity, causing DC bus overvoltage during deceleration.

Click steps to track your progress.

1. 1

   Increase the deceleration ramp time (Parameter P1-13) in small increments (e.g., 10-20%) and retest the stop command to see if the fault clears.

2. 2

   Check the DC bus voltage (Monitor UDC) during deceleration for spikes. If present, inspect the external braking resistor connections and measure its resistance value to verify it matches Parameter P2-22.

3. 3

   Manually attempt to rotate the mechanical load (with power disconnected and locked out) to check for binding, excessive friction, or mechanical damage that would impede deceleration.

4. 4

   Verify all motor nameplate data (P1-01, Motor rated power; P1-02, Motor rated frequency; P1-03, Motor rated voltage; P1-04, Motor rated current; P1-05, Motor rated speed) are correctly entered into the drive.

5. 5

   Confirm the motor's braking torque capability is sufficient for the application's inertia, considering the drive's current limits during regeneration.

6. 6

   If the problem persists with a correctly sized braking resistor and adjusted ramp times, consider using a controlled stop function (e.g., DC injection braking) or a larger braking resistor solution.