Parameter description
vacon • 66
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4
P9.11 T
HERMAL
PROTECTION
OF
THE
MOTOR
0: No action
1: Warning
2: Fault
This is a software protection, based on time integral of current.
P9.12 M
OTOR
AMBIENT
TEMPERATURE
Change if environment is not standard.
P9.13 M
OTOR
COOLING
FACTOR
AT
ZERO
SPEED
Defines the cooling factor at zero speed in relation to the point where the motor is running at
nominal speed without external cooling. See Figure 17.
The default value is set assuming that there is no external fan cooling the motor. If an external
fan is used this parameter can be set to 90% (or even higher).
Setting this parameter does not affect the maximum output current of the drive which is deter-
mined by parameter P1.5 alone.
The corner frequency for the thermal protection is 70% of the motor nominal frequency (P1.7).
Set 100% if the motor has independent fan or cooling. Set 30-40% if the fan is on motor shaft.
Figure 17. Motor thermal current I
T
curve.
f
f
n
Par.
P9.13=40%
0
I
T
100%
Overload area
P
cooling
Corner freq
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