Danfoss VLT AutomationDrive FC 301 Programming Manual page 60

Parameter Descriptions
2-25 Brake Release Time
Range:
0.20 s [0 - 5
*
s]
3 3
3.4.4 Hoist Mechanical Brake
The hoist mechanical break control supports the following
functions:
•
2 channels for Mechanical Brake feedback to offer
further protection against unintended behaviour
resulting from broken cable.
•
Monitoring of Mechanical Brake feedback
throughout the complete cycle. This helps protect
the mechanical brake - especially if more
Motor
Speed
Torque
Ref.
Brake
Relay
High
Low
Mech Brake
Feedback
High
Low
Open
Mech Brake
Position
Closed
Gain Boost or
Postion Control
Illustration 3.20 Brake release sequence for hoist mechanical brake control. This brake control is available in FLUX with motor
feedback only, available for asynchronous and non-salient PM motors.
58
Function:
This value defines the time it takes for the
mechanical brake to open. This parameter
must act as a time-out when brake feedback is
activated.
Torque Ramp Brake Release
Up Time Time
p. 2-27 p. 2-25
Torque Ref. p. 2-26
W22
Active
Contact no.1
E.g. D132 [70] Mech. Brake Feedback
Contact no.2
OPTIONAL
E.g. D133 [71] Mech. Brake Feedback
Gain Boost. p. 2-28
®
VLT AutomationDrive FC 301/302 Programming Guide
•
•
•
Ramp 1 Up
P. 3-41
A22
Active
MG33MH02 - Rev. 2013-09-30
frequency converters are connected to the same
shaft.
No ramp up until feedback confirms mechanical
brake is open.
Improved load control at stop. If 2-23 is set too
short, W22 is activated and the torque is not
allowed to ramp down.
The transition when motor takes over the load
from the brake can be configured. 2-28 Gain
Boost Factor can be increased to minimise the
movement. For very smooth transition change
the setting from the speed control to the position
control during the change-over.
•
Set 2-28 Gain Boost Factor to 0 to enable
Position Control during 2-2 Brake Release
Time. This enables parameters 2-30 to
2-33 which are PID parameters for the
Position Control.
Ramp 1 Down Stop Delay Activate Brake
P. 3-42 P. 2-24 Delay
P. 2-23
A22
Active
Torque Ramp
Down Time
p. 2-29
W22
Active