Motor temperature sensor error

What does Sd6 mean?

The encoder for detecting the motor temperature at X7 or X8 is indicating undefined values. This prevents proper motor thermal protection and could lead to motor damage due to overheating.

• Open circuit in the motor temperature sensor (e.g., PTC, KTY, PT100/1000) wiring connected to X7 or X8 terminal.
• Short circuit in the temperature sensor wiring, causing a resistance value outside the normal operating range.
• Damaged temperature sensor element within the motor winding, often due to overheating or mechanical stress.
• Incorrect sensor type configured in the drive parameters (e.g., P3-50, P3-51) compared to the actual installed sensor.
• Electromagnetic interference on the temperature sensor cable, especially for analog (e.g., PT100/1000) signals, leading to erratic readings.

Click steps to track your progress.

1. 1

   Power off the drive, disconnect the temperature sensor cable from X7 or X8, and measure the sensor resistance at ambient temperature.

2. 2

   Compare the measured resistance to the sensor's datasheet (e.g., ~25 Ohm for PTC, ~1k Ohm for KTY at 20°C, ~100 Ohm for PT100 at 0°C).

3. 3

   Verify drive parameters (e.g., P3-50, P3-51) are correctly configured for the specific type of motor temperature sensor installed.

4. 4

   Inspect the sensor cable for cuts, insulation damage, or loose connections at X7/X8 terminals and the motor connection box.

5. 5

   If using a PT100/1000 sensor, verify the cable shielding is properly connected and grounded to prevent EMI.

6. 6

   Temporarily connect a known good resistor of appropriate value (e.g., 25 Ohm for PTC) across the X7/X8 input to bypass the sensor and check the drive's response.