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VACON® 3000
Application Guide
If you use long motor cables (maximum 100 m) with small drives (≤1.5 kW), the motor current that the drive measures can be
much higher than the actual motor current. It is because there are capacitive currents in the motor cable.
OVERHEATING BECAUSE OF BLOCKED AIRFLOW
If the airflow to the motor is blocked, the function does not protect the motor, and the motor can become too hot. This can
damage the motor.
-
Make sure that the airflow to the motor is not blocked.
7.154 (ID 705) Ambient Temperature
Location in the menu:
•
INU application: P3.9.2.2
Use this parameter to set the ambient temperature where the motor is installed. The temperature value is given in Celsius or Fah-
renheit degrees.
7.155 (ID 706) Zero Speed Cooling Factor
Location in the menu:
•
INU application: 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 the parameter P3.1.1.4 Motor Nominal Current, this parameter is automatically set to its default value.
Changing this parameter does not affect the maximum output current of the drive. Only parameter P3.1.3.1Motor Current Limit can
change the maximum output current.
The corner frequency for the thermal protection is 70% of the value of the parameter Motor Nominal Frequency (ID 111).
A
100%
ID706=40%
0
Illustration 37: The motor thermal current IT curve
A
P
Cooling
B
Overload area
198 | Danfoss A/S © 2021.09
N O T I C E
N O T I C E
B
f n
f
C
C
I T
Corner frequency
AB319735759636en-000101 / DPD01822
Parameter descriptions
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