Danfoss VLT AutomationDrive FC 301 Programming Manual page 87

Parameter Descriptions
Motor
Speed
Torque Ramp
Up Time
p. 2-27
Torque Ref. p. 2-26
W22
Active
Torque
Ref.
Brake
Relay
High
Contact no.1
E.g. DI32 [70] Mech. Brake Feedback
Low
Mech Brake
Feedback
High
Contact no.2
OPTIONAL
Low
E.g. DI33 [71] Mech. Brake Feedback
Open
Mech Brake
Position
Closed
Gain Boost. p. 2-28
Gain Boost or
Postion Control
Illustration 3.20 Brake Release Sequence for Hoist Mechanical Brake Control
Parameter 2-26 Torque Ref to parameter 2-33 Speed PID Start
Lowpass Filter Time 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
*
300 %] 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.
M0013101
Programming Guide
Brake Release Ramp 1 Up
Time P. 3-41
p. 2-25
A22
Active
Danfoss A/S © 10/2019 All rights reserved.
Ramp 1 Down Stop Delay
P. 3-42 P. 2-24
A22
Active
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. Value 0 enables very fast
magnetization in flux control
principle.
2-28 Gain Boost Factor
Range: Function:
1 [0 - 4 ] 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 minimize the
movement. Activate the advanced
mechanical braking (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.
*
Activate Brake Torque Ramp
Delay Down Time
P. 2-23 p. 2-29
W22
Active
85
3 3