Danfoss VLT AutomationDrive FC 302 Programming Manual page 65

Parameter Descriptions
Parameters 2-26 to 2-33 are only available for the hoist
mechanical brake control (FLUX with motor feedback).
2-26 Torque Ref
Range: Function:
0 [ -300 - The value defines the torque applied against the
% 300 %] 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
(parameter 2-26 Torque Ref vs. actual torque) is,
the more movement during load take over.
2-27 Torque Ramp Up Time
Range: Function:
0.2 s [0 - 5 s] The value defines the duration of the torque
*
ramp in clockwise direction.
2-28 Gain Boost Factor
Range: Function:
1 [0 - Only active in flux closed loop. The function ensures
*
4 ] 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.
2-29 Torque Ramp Down Time
Range: Function:
0 s [0 - 5 s] Torque Ramp Down Time.
*
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 [0.0000 - 1.0000 ]
*
2-31 Speed PID Start Proportional Gain
Range:
0.0150 [0.0000 - 1.0000 ]
*
®
VLT AutomationDrive FC 301/302 Programming Guide
2-32 Speed PID Start Integral Time
Range:
200.0 ms
2-33 Speed PID Start Lowpass Filter Time
Range:
10.0 ms
*
Function:
Function:
MG33MI02 - Rev. 2013-11-20
[1.0 - 20000.0 ms]
*
[0.1 - 100.0 ms]
Function:
3 3
Function:
63