PT100 Motor Temperature Fault

Was bedeutet PT100 ?

This fault indicates that the PT100 temperature sensor connected to the motor has detected an over-temperature condition or a sensor malfunction (e.g., open circuit, short circuit). This is a critical protective measure for the motor, signaling that its temperature has exceeded safe limits. Prolonged overheating can lead to irreversible damage to motor windings and insulation, resulting in motor failure.

• Open circuit in the PT100 sensor wiring (e.g., broken wire, loose terminal connection at motor or VSD).
• Short circuit in the PT100 sensor wiring (e.g., damaged insulation, wire-to-wire contact).
• Failure of the PT100 sensor element itself (e.g., internal damage, degradation of resistance).
• Motor over-temperature condition exceeding the VSD's programmed PT100 trip threshold (e.g., P1-55).
• Incorrect PT100 input configuration in the VSD (e.g., wrong analog input selected, scaling error, disabled sensor).

Klicken Sie auf Schritte, um Ihren Fortschritt zu verfolgen.

1. 1

   Verify PT100 sensor wiring connections at the motor terminal box and VSD input terminals (e.g., AI3, AI4). Check for tight connections.

2. 2

   Measure the resistance of the PT100 sensor at its terminals. Expected values: 100 Ohms at 0°C, increasing linearly with temperature (e.g., 107.79 Ohms at 20°C).

3. 3

   Disconnect the PT100 sensor wires from the VSD. Connect a precision resistor (e.g., 100 Ohm, 120 Ohm) to the VSD input to simulate temperatures.

4. 4

   Confirm the motor's actual temperature using a thermal camera or contact thermometer. Compare to the VSD's PT100 trip setting (P1-55).

5. 5

   Check VSD parameters P1-53 (Sensor Type = PT100) and P1-55 (PT100 Trip Temperature) are correctly configured.