Danfoss VLT AutomationDrive FC 300 Series - Page 56

2-26 Torque Ref
Range: Function:
0.00 %* [ 0 - 0 %] The value defines the torque applied
against the closed mechanical brake, before
release
2-27 Torque Ramp Time
Range: Function:
0.2 s* [0.0 - 5.0 s] The value defines the duration of the torque
ramp in clockwise direction.
2-28 Gain Boost Factor
Range: Function:
1.00 * [1.00 -
4.00 ]
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.
Mech.
Brake
Gain
Boost
Relay
Torque
ref.
Motor
Speed
Premag Torque Ramp
Time
p. 2-27
Torque Ref. 2-26
Gain Boost Factor
p. 2-28
Brake
Release
Time
p. 2-25
Ramp 1 up
p. 3-41
Ramp 1 down
p. 3-42
Stop
Delay
p. 2-24
Activate
Brake
Delay
p. 2-23
1 2 3
130BA642.12
II
I
Illustration 3.20 Brake release sequence for hoist mechanical brake control
I) Activate brake delay: The frequency converter starts again from the mechanical brake engaged position.
II) Stop delay: When the time between successive starts is shorter than the setting in 2-24 Stop Delay, the frequency converter starts
without applying the mechanical brake (e.g. reversing).
Parameter Descriptions
VLT
®
AutomationDrive Programmming Guide
MG33ME02 - VLT
®
is a registered Danfoss trademark 55
3
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