Danfoss VLT AutomationDrive FC 302 Programming Manual page 66

Parameter Descriptions
Motor
Speed
3 3
Torque
Ref.
Brake
Relay
High
Low
Mech Brake
Feedback
High
Low
Open
Mech Brake
Position
Closed
Gain Boost or
Postion Control
Illustration 3.20 Brake release sequence for hoist mechanical brake control. This brake control is available in Flux with motor
feedback only, available for asynchronous and non-salient PM motors.
Parameters 2-26 to 2-33 are only available for the hoist
mechanical brake control (FLUX with motor feedback).
2-26 Torque Ref
Range:
0 [ -300 -
% 300 %]
*
2-27 Torque Ramp Up Time
Range:
0.2 s [0 - 5 s] The value defines the duration of the torque
*
64
Torque Ramp Brake Release
Up Time Time
p. 2-27 p. 2-25
Torque Ref. p. 2-26
W22
Active
Contact no.1
E.g. DI32 [70] Mech. Brake Feedback
Contact no.2
OPTIONAL
E.g. DI33 [71] Mech. Brake Feedback
Gain Boost. p. 2-28
Function:
The value defines the torque applied against the
closed mechanical brake, before release.
The torque/load on a crane is positive and
between 10% and 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.
Function:
ramp in clockwise direction.
Danfoss A/S © Rev. 10/2014 All rights reserved.
®
VLT AutomationDrive FC 301/302
Ramp 1 Up
P. 3-41
A22
Active
2-28 Gain Boost Factor
Range:
1 [0 -
*
4]
2-29 Torque Ramp Down Time
Range:
0 s
*
Parameters 2-30 to 2-33 can be set up for very smooth
transition change from speed control to position control
during 2-25 Brake Release Time - the time when the load is
transferred from the mechanical brake to the frequency
converter. Parameters 2-30 to 2-33 are activated when 2-28
Gain Boost Factor is set to 0. See Illustration 3.20 for more
information.
2-30 Position P Start Proportional Gain
Range:
0.0000
*
Ramp 1 Down Stop Delay Activate Brake
P. 3-42 P. 2-24 Delay
P. 2-23
A22
Active
Function:
Only active in Flux closed loop. The function ensures
a smooth transition from torque control mode to
speed control mode when the motor takes over the
load from the brake.
Increase to minimise the movement. Activate the
Advanced Mechanical Brake (parameter group 2-3*
Adv. Mech Brake) by setting parameter 2-28 Gain
Boost Factor to 0.
Function:
[0 - 5 s] Torque Ramp Down Time.
[0.0000 - 1.0000]
Torque Ramp
Down Time
p. 2-29
W22
Active
Function:
MG33MJ02