Parameters: 2-** Brakes - Danfoss VLT AutomationDrive FC 302 Programming Manual

Parameter Descriptions
NOTICE
Standard parameters still need configuration (e.g.
parameter 4-19 Max Output Frequency etc.).
Application Settings
Low inertia applications 1-17 Voltage filter time const. to be
I /I <5 increased by factor 5 to 10
Load Motor
1-14 Damping Gain should be
reduced
1-66 Min. Current at Low Speed
should be reduced (<100%)
Low inertia applications Keep calculated values
50>I /I >5
Load Motor
High inertia applications 1-14 Damping Gain,
I /I > 50 parameter 1-15 Low Speed Filter Time
Load Motor
Const. and parameter 1-16 High
Speed Filter Time Const. should be
increased
High load at low speed 1-17 Voltage filter time const. should
<30% (rated speed) be increased
1-66 Min. Current at Low Speed
should be increased (>100% for
longer time can overheat the motor)
Table 3.9 Recommendations for VVC
If the motor starts oscillating at a certain speed, increase
1-14 Damping Gain. Increase the value in small steps.
Depending on the motor, a good value for this parameter
can be 10% or 100% higher than the default value.
Adjust starting torque in 1-66 Min. Current at Low Speed.
100% provides nominal torque as starting torque.
Application Settings
Low inertia applications Keep calculated values
High inertia applications parameter 1-66 Min. Current at Low
Speed
Increase speed to a value between
default and maximum depending on
application.
Set ramp times matching the
application. Too fast ramp up causes
an overcurrent/overtorque. Too fast
ramp down causes an overvoltage
trip.
High load at low speed parameter 1-66 Min. Current at Low
Speed
Increase speed to a value between
default and maximum depending on
application.
Table 3.10 Recommendations for FLUX Applications
Adjust starting torque in parameter 1-66 Min. Current at
Low Speed. 100% provides nominal torque as starting
torque.
®
VLT AutomationDrive FC 301/302 Programming Guide
plus
Applications
MG33MI02 - Rev. 2013-11-20

3.4 Parameters: 2-** Brakes

3.4.1 2-0* DC-Brakes
Parameter group for configuring the DC brake and DC
hold functions.
2-00 DC Hold Current
Range: Function:
50 [ 0 - Enter a value for holding current as a percentage
% 160 %] of the rated motor current I
*
parameter 1-24 Motor Current. 100% DC holding
current corresponds to I
This parameter holds the motor function (holding
torque) or pre-heats the motor.
This parameter is active if DC hold is selected in
parameter 1-72 Start Function [0] or
parameter 1-80 Function at Stop [1].
NOTICE
The maximum value depends on the rated motor
current.
Avoid 100 % current for too long. It may damage the
motor.
Low values of DC hold produces larger than expected
currents with larger motor power sizes. This error
increases as the motor power increases.
2-01 DC Brake Current
Range: Function:
50 [ 0 - Enter a value for current as a percentage of the
% 1000 rated motor current I
*
%]
Current. 100% DC braking current corresponds to
I .
M,N
DC brake current is applied on a stop command,
when the speed is lower than the limit set in
parameter 2-03 DC Brake Cut In Speed [RPM]; when
the DC Brake Inverse function is active; or via the
serial communication port. The braking current is
active during the time period set in
parameter 2-02 DC Braking Time.
NOTICE
The maximum value depends on the rated motor
current.
Avoid 100 % current for too long. It may damage the
motor.
2-02 DC Braking Time
Range: Function:
10 s [0 - 60 s] Set the duration of the DC braking current set
*
in 2-01 DC Brake Current, once activated.
set in
M,N
.
M,N
, see parameter 1-24 Motor
M,N
57
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