Parameters 227
35.55 Motor thermal time
constant
Defines the thermal time constant for use with the motor
thermal protection model, defined as the time to reach
63% of the nominal motor temperature. See the motor
manufacturer's recommendations.
256 s
100…10000 s Motor thermal time constant. 1 = 1 s
35.56 Motor overload action Defines what action the drive should take when the motor
overload specified by parameter 35.57 occurs.
Warning and
fault
No action No action taken. 0
Warning only Drive generates warning A783 Motor overload when the
motor is overloaded to the warning level, that is,
parameter 35.05 reaches value 88.0%.
1
Warning and fault Drive generates warning A783 Motor overload when the
motor is overloaded to the warning level, that is,
parameter 35.05 reaches value 88.0%.
Drive trips on fault 7122 Motor overload when the motor is
overloaded to the fault level, that is, parameter 35.05
reaches value 100.0%.
2
35.57 Motor overload class
Defines the motor overload class to be used. The class of
protection is specified by the user as the time for tripping
at 6 times the tripping level current.
The function shares the following parameters with the
Motor thermal model:
• 35.51
• 35.52
• 35.53
Together, these three parameters set the tripping level as
a function of motor frequency.
Class 20
Class 5 Motor overload class 5. 0
Class 10 Motor overload class 10. 1
No. Name/Value Description Default
FbEq 16
100%
63%
100%
Time
Time
Motor thermal time
Motor current
Temperature rise
ACS180 FW.book Page 227 Tuesday, March 9, 2021 2:25 PM
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