Internal controller temperature sensor error
Lenze · 9300 Series
What does H11 mean?
The sensor for detecting the internal temperature of the controller is indicating undefined values. This prevents accurate monitoring of the internal component temperature, risking damage from overheating.
Common Causes
- Failure of the internal control board temperature sensor, sending an invalid signal.
- Intermittent connection or damage to the sensor on the control board due to vibration or manufacturing defect.
- Corruption of the analog-to-digital converter (ADC) or processing logic on the control board responsible for reading the sensor.
- Excessive internal heat buildup in the enclosure leading to sensor malfunction or damage, even if the heatsink is cool.
Repair Steps & Checklist
Click steps to track your progress.
- 1
Power cycle the drive (disconnect mains, wait 5 minutes) to reset the internal monitoring circuits.
- 2
Ensure the ambient temperature around the drive is within the specified operating limits (e.g., 0-50°C) as per the datasheet.
- 3
Inspect the control board for any visible damage or signs of overheating, particularly around the temperature sensor component (often a small SMD thermistor).
- 4
Check all internal ribbon cables and connectors on the control board for proper seating and connection.
- 5
If applicable, use diagnostic software to view the raw internal temperature sensor value; if it's constantly at an extreme (e.g., -40°C or +150°C), the sensor is likely faulty.