Honeywell SmartVFD HVAC2 Applications Manual page 162

Mtp: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 -20 and 100 degrees Celsius.
Mtp:Zero speed cooling
Defines the cooling factor at zero speed in
relation to the point where the motor is running at
nominal speed without external cooling. 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).
If you change the parameter P1.4 (Motor nominal
current), this parameter is automatically restored
to the default value.Setting this parameter does
not affect the maximum output current of the
drive which is determined by parameter P1.7
alone.
The corner frequency for the thermal protection is
70% of the motor nominal frequency(P1.2).
The cooling power can be set between 0 - 150.0%
x cooling power at nominal frequency. See Figure
"Motor thermal current IT curve" on page 162.
P
cooling
100%
P13.9=40%
Fig. 60. Motor thermal current IT curve
162
Overload area
0
Corner freq
I
T
f
f
n
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