Danfoss VLT AutomationDrive FC 301 Programming Manual page 85

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 Braking
2-20 Release Brake Current
Range: Function:
Size [ 0 - par. Set the motor current for release of
related 16-37 A] the mechanical braking when a
*
start condition is 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 braking 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 - par. 4-53 Set the motor speed for activation
related RPM] of the mechanical braking, when a
*
stop condition is present. The
upper speed limit is specified in
parameter 4-53 Warning Speed High.
M0013101
Programming Guide
Par 1-74
Start speed
Par 1-76 Start current/
Par 2-00 DC hold current
Reaction time EMK brake
Danfoss A/S © 10/2019 All rights reserved.
Par 2-20
Release brake current
2-22 Activate Brake Speed [Hz]
Range: Function:
Size [ 0 - 5000.0 Set the motor frequency for
related Hz] activation of the mechanical
*
braking when a stop condition is
present.
2-23 Activate Brake Delay
Range: Function:
0 s [0 - 5 s] Enter the brake delay time of the
*
coast after ramp-down time. The
shaft is held at 0 speed with full
holding torque. Ensure that the
mechanical braking 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 braking, set
parameter 2-23 Activate Brake Delay
and parameter 2-24 Stop Delay.
Setting of brake delay parameters
does not affect the torque. The
frequency converter does not
register that mechanical braking is
holding the load.
After setting parameter 2-23 Activate
Brake Delay, the torque drops to 0
after a few minutes. The sudden
3
Par 2-21
Activate brake
speed
Time
83
3