Motor underload

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The motor underload protection has tripped, indicating that the motor is operating with insufficient mechanical load or no load at all. This can be caused by a broken belt, pump cavitation, an uncoupled shaft, or a process anomaly. Operating in an underload condition can sometimes lead to drive instability or signify a mechanical issue that requires attention.

• Mechanical load disconnection (e.g., broken belt, coupling failure, pump impeller damage) causing motor current to drop below parameter P2-22 (Underload current limit).
• Process fluid loss or cavitation in pump applications, reducing required torque and current draw below setpoint P2-22.
• Incorrectly configured motor underload threshold (Parameter P2-22) or delay time (Parameter P2-23) for the actual process load conditions.
• Motor shaft or driven equipment blockage (e.g., jammed valve) preventing proper load engagement or causing a sudden reduction in load.

Klicken Sie auf Schritte, um Ihren Fortschritt zu verfolgen.

1. 1

   Inspect mechanical coupling between motor and driven equipment for damage or disconnection.

2. 2

   Verify the process load (e.g., fluid level in pump, material flow on conveyor) corresponds to normal operating conditions.

3. 3

   Measure motor output current (terminals U, V, W or display parameter P0-01) and compare against motor nameplate full load current and underload trip threshold (P2-22).

4. 4

   Review and adjust Parameter P2-22 (Underload current limit) and Parameter P2-23 (Underload delay time) to match actual process characteristics, if motor current is consistently below P2-22.

5. 5

   Perform a controlled start-up and monitor motor current via P0-01 to confirm proper load engagement and current draw.