Programming Guide | VLT® AutomationDrive FC 360
Data type: Uint16 Change during operation: True
This parameter is used to set AC brake power capability (set ramp-down time when inertia is constant). In cases where the DC-link
voltage is not higher than the DC-link voltage trip value, the generator torque can be adjusted with this parameter. The higher the AC
brake gain is, the stronger the brake capability is. Selecting 1.0 means that there is no AC brake capability.
 NOTICE
If there is continuous generator torque, higher generator torque causes higher motor current, and the motor becomes hot. In this
condition, parameter 2-16 AC Brake, Max current can be used to protect the motor from overheating.
4.2.10 1-9* Motor Temperature
Parameters for adjusting temperature protection settings for the motor.
1-90 Motor Thermal Protection
Default value: [0] No protection Parameter type: Option
Setup: All setups Conversion index: –
Data type: Uint8 Change during operation: True
Motor thermal protection can be implemented via a PTC sensor in the motor windings connected to 1 of the analog or digital inputs
(parameter 1-93 Thermistor Source), or via calculation (ETR = Electronic Thermal Relay) of the thermal load, based on the actual load
and time. The calculated thermal load is compared with the rated motor current I
M,N
and the rated motor frequency f
M, N
. It is possible to
activate an overheat warning or alarm.
Option Name Description
[0] No protection Continuously overloaded motor, when no
warning or trip of the drive is required.
[1] Thermistor warning Activate a warning when the connected
thermistor in the motor reacts to a motor
overtemperature.
[2] Thermistor trip Stop (trip) the drive when the connected
thermistor in the motor reacts to a motor
overtemperature. The thermistor cut
out value must be > 3 kΩ. Integrate a
thermistor (PTC sensor) in the motor for
winding protection.
[3] ETR warning 1 Calculates the load and activates a
warning in the display when the motor is
overloaded. Program a warning signal via
1 of the digital outputs.
Danfoss A/S © 2024.01 AU275649936274en-001401 / 130R0507 | 75
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