Danfoss VLT AutomationDrive FC 301 Programming Manual page 71

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. This brake control is available in flux control principle
with feedback or in sensorless mode, available for asynchronous, and non-salient PM motors.
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 applied against the
300 %] 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.
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.
MG33ML02
Programming Guide
Brake Release Ramp 1 Up
Time P. 3-41
p. 2-25
A22
Active
3.4.5 2-3* Adv. Mech Brake
Parameter 2-30 Position P Start Proportional Gain to
parameter 2-33 Speed PID Start Lowpass Filter Time can be
set up for very smooth transition change from speed
control to position control during parameter 2-25 Brake
Release Time - the time when the load is transferred from
the mechanical brake to the frequency converter.
Parameter 2-30 Position P Start Proportional Gain to
parameter 2-33 Speed PID Start Lowpass Filter Time are
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Ramp 1 Down Stop Delay
P. 3-42 P. 2-24
A22
Active
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 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
69
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