Danfoss VLT AutomationDrive FC 300 Series Programming Guide

Parameter 2-22 Activate Brake Speed [Hz]
Table 170: Parameter 2-22 Activate Brake Speed [Hz]
2-22 Activate Brake Speed [Hz]
Default value: Size related
Parameter type: Range, 0 - 5000.0 Hz
Setup: All setups
Conversion index: -1
Data type: Uint16
Change during operation: True
Set the motor frequency for activation of the mechanical braking when a stop condition is present.
Parameter 2-23 Activate Brake Delay
Table 171: Parameter 2-23 Activate Brake Delay
2-23 Activate Brake Delay
Default value: 0 s
Parameter type: Range, 0 - 5 s
Setup: All setups
Conversion index: -1
Data type: Uint8
Change during operation: True
Enter the brake delay time of the coast after ramp-down time. The shaft is held at 0 speed with full holding torque. Ensure that the
mechanical braking has locked the load before the motor enters coast mode. To adjust transition of the load to the mechanical
braking, set parameter 2-23 Activate Brake Delay and parameter 2-24 Stop Delay. Setting of brake delay parameters does not affect
the torque. The drive does not register that mechanical braking is holding the load. After setting parameter 2-23 Activate Brake De-
lay, the torque drops to 0 after a few minutes. The sudden torque change leads to movement and noise.
Parameter 2-24 Stop Delay
Table 172: Parameter 2-24 Stop Delay
2-24 Stop Delay
Default value: 0 s
Parameter type: Range, 0 - 5 s
Setup: All setups
Conversion index: -1
Data type: Uint8
Change during operation: True
Set the time interval from the moment when the motor is stopped until the brake closes. To adjust transition of the load to the
mechanical braking, set parameter 2-23 Activate Brake Delay and parameter 2-24 Stop Delay. This parameter is a part of the stop func-
tion.
Parameter 2-25 Brake Release Time
Table 173: Parameter 2-25 Brake Release Time
2-25 Brake Release Time
Default value: 0.20 s
Parameter type: Range, 0 - 5 s
Setup: All setups
Conversion index: -2
Data type: Uint16
Change during operation: True
This value defines the time it takes for the mechanical brake to open. This parameter must act as a timeout when brake feedback is
activated.
Parameter 2-26 Torque Ref
Table 174: Parameter 2-26 Torque Ref
2-26 Torque Ref
Default value: 0%
Parameter type: Range, -300 - 300%
Setup: All setups
Conversion index: -2
Data type: Int16
Change during operation: True
The value defines the torque applied against the closed mechanical brake before release. The torque/load on a crane is positive and
is 10–160%. To obtain the best starting point, set parameter 2-26 Torque Ref to approximately 70%. The torque/load on a lift can be
both positive and negative and between -160% and +160%. To obtain the best starting point, set parameter 2-26 Torque Ref to 0%.
The higher the torque error is (parameter 2-26 Torque Ref vs. actual torque), the more movement during load takeover.
AU275636650261en-000101 / 130R0334120 | Danfoss A/S © 2022.12
Parameter Descriptions
VLT AutomationDrive FC 301/302
Programming Guide

Danfoss VLT AutomationDrive FC 300 Series Specifications

General

Brand	Danfoss
Model	VLT AutomationDrive FC 300 Series
Category	DC Drives
Language	English