Operating instructions

Functions
5.8 Protection functions
CU240S and CU240E Control Units, FW 3.2
118 Operating Instructions, 03/2009, A5E02440075B AA
5.8 Protection functions
The frequency inverter offers protective functions against overtemperature and overcurrent
for both the frequency inverter as well as the motor. Further, the frequency inverter protects
itself against an excessively high DC link voltage when the motor is regenerating.
The load torque monitoring functions provide effective plant and system protection.
5.8.1 Overtemperature protection for the frequency inverter and motor
Temperature monitoring for the inverter (Power Module)
Parameter
s
Description
P0003 = 3 User access level
3: Expert
P0290 = 2 Temperature monitoring of the Power Module
This defines the response of the inverter to an internal overtemperature.
0: Reduce the output frequency
1: Shutdown (F0004)
2: Reduce pulse frequency and output frequency (factory setting)
3: Reduce pulse frequency, then shut down (F0004)
P0292 Parameterizes the alarm threshold for heatsink and module temperature monitoring
(Power Module)
Temperature monitoring for the motor
Two options are available for implementing thermal motor protection:
● Temperature sensing in the motor with PTC sensor, KTY 84 sensor or ThermoClick
sensor
● Temperature calculation without sensors by analyzing the rating plate data and ambient
temperature of the motor. (Only possible in the 'vector control' mode)
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