User Manual Manual

Functions 3-46
Publication 825-UM001B-EN-P January 2001
PTC Thermistor Input
Function
The thermistor detectors (PTCs) are embedded in the stator winding of the motor. They
monitor the actual temperature of the winding. Influences independent of the motor current,
such as ambient temperature, obstructed cooling, etc., are taken into account.
The detectors and their leads are monitored for short-circuit and open circuit.
Applications
As additional protection for:
• Motors above 7.5 kW (10 HP)
• High ambient temperatures, dusty environment
• Varying loads
• Plugging, etc.
Table 3.Y PTC Setting Parameters
➊ If auxiliary relays #2 and #3 are assigned to the communication (refer to page 5-16) they cannot be selected
here.
Function
Factory setting Off
Output Relay ➊
Selection (relays) MR, AL, #1…#5
Factory setting MR