Motor thermistor overtemp
Danfoss · VLT HVAC Drive High Power
What does ALARM 11 mean?
The motor thermistor indicates an overtemperature condition, or it may be disconnected. The frequency converter can be configured to issue either a warning or an alarm based on parameter 1-90 Motor Thermal Protection. This fault protects the motor from thermal damage.
Complete Troubleshooting Guide
- 1
Inspect the motor for signs of overheating.
- 2
Check if the motor is mechanically overloaded.
- 3
Verify the thermistor is correctly connected between terminal 53 or 54 (analog voltage input) and terminal 50 (+10 V supply), and that the terminal switch is set for voltage. Also, ensure parameter 1-93 Thermistor Resource is set to terminal 53 or 54.
- 4
If using digital inputs 18 or 19, check that the thermistor is connected correctly between either terminal 18 or 19 (digital input PNP only) and terminal 50.
- 5
If a KTY Sensor is used, check for correct connection between terminals 54 and 55, and verify programming of parameters 1-95 KTY Sensor Type, 1-96 KTY Thermistor Resource, and 1-97 KTY Threshold level matches sensor wiring.