Vacon 100 Industrial Applications Manual page 274

VACON · 274
To adjust the thermal protection of the motor, use the parameters from P3.9.2.1 to P3.9.2.5.
You can monitor the thermal status of the motor on the display of the control panel. See
Chapter 3 User interfaces.
NOTE!
If you use long motor cables (max. 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.
CAUTION!
Make sure that the airflow to the motor is not blocked. If the airflow is blocked, the
function does not protect the motor, and the motor can become too hot. This can
cause damage to the motor.
P3.9.2.1 MOTOR THERMAL PROTECTION (ID 704)
Use this parameter to select the response of the drive to a 'Motor Overtemperature' fault.
If the motor thermal protection function detects that the temperature of the motor is too
high, a motor overtemperature fault occurs.
NOTE!
If you have a motor thermistor, use it to protect the motor. Set the value of this
parameter to 0.
P3.9.2.2 AMBIENT TEMPERATURE (ID 705)
Use this parameter to set the ambient temperature where the motor is installed.
The temperature value is given in celsius or fahrenheit degrees.
P3.9.2.3 ZERO SPEED COOLING FACTOR (ID 706)
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. If you use an external
fan, you can set the value higher than without the fan, for example at 90%.
If you change parameter P3.1.1.4 (Motor Nominal Current), parameter P3.9.2.3 is
automatically set to its default value.
Although you change this parameter, it does not have an effect on 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.
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PARAMETER DESCRIPTIONS