Danfoss VLT AutomationDrive FC 301 Programming Manual page 86

Parameter Descriptions
2-23 Activate Brake Delay
Range:
3 3
2-24 Stop Delay
Range:
0 s
*
2-25 Brake Release Time
Range:
0.20 s
*
84
Function:
torque change leads to movement
and noise.
Function:
[0 - 5 s] Set the time interval from the
moment when the motor is
stopped until the brake closes.
To adjust transition of the load to
the mechanical braking, set
parameter 2-23 Activate Brake Delay
and parameter 2-24 Stop Delay.
This parameter is a part of the stop
function.
Function:
[0 - 5 s] This value defines the time it takes
for the mechanical brake to open.
This parameter must act as a
timeout when brake feedback is
activated.
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®
VLT AutomationDrive FC 301/302
3.3.4 Hoist Mechanical Brake
The hoist mechanical brake control supports the following
functions:
•
•
•
•
•
2 channels for mechanical braking feedback to
offer further protection against unintended
behavior resulting from broken cable.
Monitoring of mechanical braking feedback
throughout the complete cycle. This helps protect
the mechanical brake, especially if more
frequency converters are connected to the same
shaft.
No ramp-up until feedback confirms that
mechanical brake is open.
Improved load control at stop. If the value of
parameter 2-23 Activate Brake Delay is too low,
Warning 22 Hoist mech. brake 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.
Parameter 2-28 Gain Boost Factor can be increased
to minimize the movement. To achieve smooth
transition, change the setting from the speed
control to the position control during the
changeover.
- Set parameter 2-28 Gain Boost Factor to
0 to enable position control during
parameter 2-02 DC Braking Time. This
enables parameter 2-30 Position P Start
Proportional Gain to
parameter 2-33 Speed PID Start Lowpass
Filter Time, which are PID parameters for
the position control.
M0013101