4.3 Parameters: 2-** Brakes
4.3.1 2-0* DC Brake
Use this parameter group to configure DC brake and DC
hold functions.
2-00 DC Hold/Motor Preheat Current
Range:
Function:
50 %
*
[0 -
160 %]
Set holding current as a percentage of the rated
motor current I
M,N
parameter 1-24 Motor Current
.
This parameter holds the motor function (holding
torque) or pre-heats the motor. This parameter is
active if
[0] DC hold
is selected in
, or if
[1] DC hold/pre-
heat
is selected in
.
NOTICE
The maximum value depends on the rated
motor current. Avoid 100% current for too
long. It may damage the motor.
2-01 DC Brake Current
Range:
Function:
50
%
*
[0 -
150 %]
Set current as % of rated motor current,
. DC brake current is
applied on stop command, when speed is below
the limit set in
parameter 2-04 DC Brake Cut In
; when the DC brake inverse function is
active (parameters
5-1* Digital Inputs
are set to
[5]
DC-brake inverse
); or via the serial port. See
parameter 2-02 DC Braking Time
for duration.
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 brake current set in
parameter 2-01 DC Brake Current
, once
activated.
2-04 DC Brake Cut In Speed
Range:
Function:
0 Hz
*
[ 0 -
400 Hz]
This parameter is for setting the DC brake cut-
in speed at which the DC brake current
parameter 2-01 DC Brake Current
is to be active,
with a stop command.
2-04 DC Brake Cut In Speed
Range:
Function:
NOTICE
This parameter is not active when
parameter 1-10 Motor Construction
is set
to options that enable PM motor mode.
2-06 Parking Current
Range:
Function:
50 %
*
[ 0 - 1000 %] Set current as percentage of rated motor
current,
parameter 1-24 Motor Current
.
2-07 Parking Time
Range:
Function:
3 s
*
[0.1 - 60 s] Set the duration of the parking current set in
parameter 2-06 Parking Current
, once activated.
4.3.2 2-1* Brake Energy Funct.
Parameter group for selecting dynamic braking parameters.
Only valid for frequency converters with brake chopper.
2-10 Brake Function
Option:
Function:
[0]
*
Off
No brake resistor is installed.
[1]
Resistor
brake
A brake resistor is incorporated in the system for
dissipation of surplus brake energy as heat.
Connecting a brake resistor allows a higher DC-
link voltage during braking (generating
operation). The brake resistor function is only
active in frequency converters with an integral
dynamic brake.
[2]
AC brake Improves braking without using a brake resistor.
This parameter controls an overmagnetisation 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 braking
torque without exceeding the voltage limit.
NOTICE
The AC brake is not as efficient as
dynamic braking with resistor.
AC brake is for VVC
+
mode in both open
and closed loop.
2-11 Brake Resistor (ohm)
Range:
Function:
Size
related
*
[ 0 -
65535
Ohm]
Set the brake resistor value in
Ω
. This
value is used for monitoring the power to
the brake resistor.
is only active in frequency
Parameter Descriptions
Programming Guide
MG06C602
Danfoss A/S © 7/2015 All rights reserved.
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