Parameters: 2-** Brakes - Danfoss VLT AutomationDrive FC 300 Programming Manual

Parameter Descriptions

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 [Application Enter a value for holding current as a
% dependant] percentage of the rated motor current I
*
set in 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 1-72 Start Function [0] or
1-80 Function at Stop [1].
NOTE
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 will produce larger than expected
currents with larger motor power sizes. This error will
increase as the motor power increases.
2-01 DC Brake Current
Range: Function:
50 [Application Enter a value for current as a percentage of
% dependant] the rated motor current I
*
Current. 100% DC braking current
corresponds to I
DC brake current is applied on a stop
command, when the speed is lower than
the limit set in 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 2-02 DC Braking
Time.
NOTE
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:
10.0 s [0.0 - 60.0 s] Set the duration of the DC braking current
*
set in 2-01 DC Brake Current, once activated.
FC 300 Programming Guide
M,N
.
M,N
, see 1-24 Motor
M,N
.
M,N
®
MG.33.MB.02 - VLT is a registered Danfoss trademark
2-03 DC Brake Cut In Speed [RPM]
Range:
Application [Application
dependent dependant]
*
2-04 DC Brake Cut In Speed [Hz]
Range:
Application [Application
dependent dependant]
*
3.4.2 2-1* Brake Energy Funct.
Parameter group for selecting dynamic braking parameters.
Only valid for drives with brake chopper.
2-10 Brake Function
Option: Function:
[0] Off No brake resistor is installed.
*
[1] Resistor A brake resistor is incorporated in the system, for
brake dissipation of surplus brake energy as heat.
Connecting a brake resistor allows a higher DC
link voltage during braking (generating
operation). The Resistor brake function is only
active in frequency converters with an integral
dynamic brake.
[2] AC brake Is selected to improve braking without using a
brake resistor. This parameter controls an
overmagnetization of the motor when running
with a generatoric load. This function can improve
the OVC-function. Increasing the electrical losses
in the motor allows the OVC function to increase
the braking torque without exceeding the over
voltage limit. Please note that AC brake is not as
effective as dynamic breaking with resistor.
AC brake is for VVC
open and closed loop.
Function:
Set the DC brake cut-in
speed for activation of the
DC braking current set in
2-01 DC Brake Current, upon
a stop command.
Function:
Set the DC brake cut-in
speed for activation of the
DC braking current set in
2-01 DC Brake Current, upon
a stop command.
plus
and flux mode in both
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