Torque limit

What does ALARM 12 mean?

The motor's torque has exceeded the value set in parameter 4-16 Torque Limit Motor Mode or the generator torque limit in parameter 4-17 Torque Limit Generator Mode. This condition can be a warning or escalate to an alarm and trip, protecting the mechanical system from excessive stress.

• Mechanical obstruction or jamming in the driven machinery, causing the motor to demand excessive torque.
• Process material buildup or blockage, increasing the load on the motor.
• Torque limit settings (P4-16, P4-17) are set too low for the application's actual torque requirements.
• Ramp times (acceleration P3-41, deceleration P3-42) are set too short, causing high transient torque demands.
• Incorrect motor data parameters, leading to inaccurate torque calculation by the frequency converter.

Click steps to track your progress.

1. 1

   Monitor the motor torque (parameter 16-15 Motor Torque) on the frequency converter display during operation.

2. 2

   Inspect the mechanical system for any obstructions, jamming, or excessive friction that would increase load.

3. 3

   Increase the torque limit values in P4-16 (Torque Limit Motor Mode) and P4-17 (Torque Limit Generator Mode) gradually, if the mechanical system allows.

4. 4

   Increase acceleration ramp time (P3-41 for ramp 1) to reduce peak torque during startup.

5. 5

   Verify motor nameplate data (kW, V, A, Hz, RPM) against the frequency converter's motor setup parameters (P1-03 to P1-07).

6. 6

   Check for proper mechanical alignment of shafts, couplings, and bearings.