Danfoss VLT AutomationDrive FC 300 Design Manual page 60

Product Introduction
3 3
MotorSpeed
Torqueref.
Relay
GainBoost
Mech.Brake
Figure 3.34 Brake Release Sequence for Hoist Mechanical Brake Control
I) Activate brake delay: The adjustable frequency drive 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 adjustable
frequency drive starts without applying the mechanical brake.
For an example of advanced mechanical brake control for hoisting applications, see.
58
Design Guide
II
I
Brake
Premag Torque Ramp
Release
Time
Time
p. 2-27
p. 2-25
Torque Ref. 2-26
Gain Boost Factor
p. 2-28
1 2 3
Danfoss A/S © Rev. 2014-02-10 All rights reserved.
Ramp 1 upp. 3-41 Ramp 1 downp. 3-42 Stop Activate
Delay Brake
p. 2-24 Delay
p. 2-23
MG34S222