Motor thermistor over temperature

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The motor's thermistor input indicates an over-temperature condition, or the thermistor or its connection is disconnected. This provides direct thermal protection for the motor, signaling a critical overheating risk if not addressed.

• Motor operating under sustained heavy load or with insufficient cooling (e.g., blocked fan, high ambient temperature).
• Motor thermistor (PTC or NTC type) open-circuited due to broken wire or internal failure.
• Thermistor wiring disconnected from the drive's input terminals (e.g., X3:1, X3:2) or poorly crimped connection.
• Thermistor input short-circuited (e.g., wiring pinched) causing an erroneous low resistance reading.
• Incorrect thermistor type selected in drive parameters (e.g., P3-05 set to wrong sensor type).

Klicken Sie auf Schritte, um Ihren Fortschritt zu verfolgen.

1. 1

   Measure the resistance of the motor thermistor directly at the motor terminals using an ohmmeter (e.g., 250 Ohms to 1.5 kOhms for PTC at room temp).

2. 2

   Verify continuity of the thermistor wiring from the motor to the drive's dedicated thermistor input terminals (e.g., X3:1, X3:2).

3. 3

   Check the motor's operating current (P0-03) and motor surface temperature with an infrared thermometer to confirm actual thermal state.

4. 4

   Ensure the thermistor input parameter (P3-05) is correctly configured for the connected sensor type (e.g., PTC, KTY, NTC).

5. 5

   Inspect the motor cooling fan for proper operation and clean any debris from motor cooling fins.