Danfoss VLT AutomationDrive FC 302 Programming Manual page 63

Parameter Descriptions
Start
1=on
term.18
0=o
Par 1-71
Start delay time
Shaft speed
Output current
Pre-magnetizing
current or
DC hold current
Par 2-23
Brake delay time
on
Relay 01
o
Mechanical brake
locked
Mechanical brake
free
Illustration 3.19 Mechanical Brake
2-20 Release Brake Current
Range: Function:
Size [ 0 - Set the motor current for release of the
related par. mechanical brake, when a start condition is
*
16-37 A] present. The default value is the maximum
current the inverter can provide for the
particular power size. The upper limit is
specified in parameter 16-37 Inv. Max.
Current.
NOTICE
When Mechanical brake control
output is selected but no mechanical
brake is connected, the function does
not work by default setting due to
too low motor current.
2-21 Activate Brake Speed [RPM]
Range: Function:
Size [0 - Set the motor speed for activation of
related 30000 the mechanical brake, when a stop
*
RPM] condition is present. The upper speed
limit is specified in
parameter 4-53 Warning Speed High.
2-22 Activate Brake Speed [Hz]
Range:
Size related [ 0 - 5000.0
*
Hz]
®
VLT AutomationDrive FC 301/302 Programming Guide
Par 1-74
Start speed
Par 1-76 Start current/
Par 2-00 DC hold current
Reaction time EMK brake
Function:
Set the motor frequency for
activation of the mechanical
MG33MI02 - Rev. 2013-11-20
Par 2-20
Release brake current
2-22 Activate Brake Speed [Hz]
Range:
brake, when a stop condition is
present.
2-23 Activate Brake Delay
Range: Function:
0 s [0 - Enter the brake delay time of the coast after ramp-
*
5 s] down time. The shaft is held at zero speed with full
holding torque. Ensure that the mechanical brake
has locked the load before the motor enters coast
mode. See Mechanical Brake Control section in the
Design Guide.
To adjust transition of the load to the mechanical
brake, set parameter 2-23 Activate Brake Delay and
parameter 2-24 Stop Delay.
Setting of brake delay parameters does not impact
the torque. The frequency converter does not
register that mechanical brake is holding the load.
After setting parameter 2-23 Activate Brake Delay the
torque drops to zero in few minutes. The sudden
torque change leads to movement and noise.
2-24 Stop Delay
Range: Function:
0 s [0 - 5 Set the time interval from the moment when the
*
s] motor is stopped until the brake closes.
Par 2-21
Activate brake
speed
Time
Function:
61
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