● For a good resolution of temperature with continuous sensors (in
general: NTCs), the value of resistor R in the figure should be
close to the sensor resistance at the motor temperature limit.
● For switching sensors (in general: PTCs), the value of resistor R in
the figure should be close to the sensor resistance when the mo-
tor is at high temperature.
● A protection threshold may be defined by users according to the
sensor’s features. If AIV is defined for other purpose, the protec-
tion with sensor could not be enabled ([S2.21] is always 0).
2. Protection without temperature sensor
This function is based on the thermal model of the motor. The simplified ther-
mal model of the motor is shown as below:
Fig. 8-25: Simplified thermal model of motor with PT1 model
The default value of "Thermal motor time constant" S2.23 is depend-
ent on the device type. If "Motor overload protection" OL-2 happens
frequently, please ensure that the output current of the frequency
converter does not exceed 110 % of the motor rated current, and in-
crease the value of S2.23 appropriately.
EFC 3600 Bosch Rexroth AG
Parameter Settings
DOK-RCON03-EFC-3600***-IT03-EN-P
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