Danfoss VACON 100 FLOW Series Application Manual page 222

VACON® 100 FLOW
Application Guide
Use this parameter to set the ambient temperature where the motor is installed. The temperature value is given in Celsius or Fah-
renheit degrees.
11.11.2.3 (ID 706) Zero Speed Cooling Factor
Location in the menu: P3.9.2.3
Use this parameter to set the cooling factor at 0 speed in relation to the point where the motor operates at nominal speed without
external cooling.
The default value is set for conditions where there is no external fan. When using an external fan, the value can be set higher than
without the fan, for example at 90%.
When changing parameter P3.1.1.4 (Motor Nominal Current), parameter P3.9.2.3 is automatically set to its default value.
Changing this parameter does not affect the maximum output current of the drive. Only parameter P3.1.3.1 Motor Current Limit can
change the maximum output current.
The corner frequency for the thermal protection is 70% of the value of the parameter P3.1.1.2 Motor Nominal Frequency.
A
100%
ID706=40%
0
Illustration 65: The Motor Thermal Current IT Curve
A P
Cooling
B Overload area
11.11.2.4 (ID 707) Motor Thermal Time Constant
Location in the menu: P3.9.2.4
Use this parameter to set the motor thermal time constant.
The time constant is the time within which the calculated thermal stage has reached 63% of its final value. The final thermal stage
equals to running the motor continuously with nominal load at nominal speed. The length of the time constant is in relation with
the dimension of the motor. The bigger the motor, the longer the time constant.
In different motors, the motor thermal time constant is different. It also changes between different motor manufacturers. The de-
fault value of the parameter changes from dimension to dimension.
The t6-time is the time in seconds that the motor can safely operate at 6 times the rated current. It is possible that the motor manu-
facturer gives the data with the motor. Use this information to set the time constant parameter. Usually, the motor thermal time
constant in minutes is 2*t6. When the drive is in the STOP state, the time constant is internally increased to 3 times the set parame-
ter value, because the cooling operates based on convection.
222 | Danfoss A/S © 2023.08
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C f n f
C
I T
Corner frequency
AB298035655957en-000201 / DPD01083
Parameter Descriptions