User Guide

Table Of Contents
68 Parameter Descriptions Honeywell
10
9.7 THERMAL PROTECTION OF THE MOTOR
0 = No response
1 = Warning
2 = Fault, stop mode after fault according to parameter 2.3
If tripping is selected the drive will stop and activate the fault stage. Deactivat-
ing the protection, i.e. setting parameter to 0, will reset the thermal model of
the motor to 0%.
9.8 MOTOR AMBIENT TEMPERATURE
When the motor ambient temperature must be taken into consideration, it is
recommended to set a value for this parameter. The value can be set between
-4 °F (-20 °C) and 212 °F (100 °C).
9.9 MOTOR COOLING FACTOR AT ZERO SPEED
The cooling power can be set between 0-150.0% x cooling power at nominal
frequency. See Figure 10.8.
Figure 10.8: Motor cooling power
9.10 MOTOR THERMAL TIME CONSTANT
This time can be set between 1 and 200 minutes.
This is the thermal time constant of the motor. The bigger the motor, the bigger
the time constant. The time constant is the time within which the calculated
thermal model has reached 63% of its final value.
The motor thermal time is specific to the motor design and it varies between
different motor manufacturers.
f
f
n
par.9.9=40%
0
I
T
100%
Overload area
P
cooling