Operating instructions

3.4 Main Menu - Brakes - Group 2
3.4.1 2-0* DC-Brakes
Parameter group for configuring the DC brake and DC hold
functions.
2-00 DC Hold/Preheat Current
Range: Function:
50 % * [Applica-
tion
dependant]
Enter a value for holding current as a
percentage of the rated motor current I
M,N
set in par. 1-24 Motor Current. 100% DC
holding current corresponds to I
M,N
.
This parameter holds the motor (holding
torque) or pre-heats the motor.
This parameter is active if [1] DC hold/
Preheat is selected in par. 1-80 Function at
Stop.
NOTE
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
%
*
[Applica-
tion
dependant]
Enter a value for current as a percentage of the
rated motor current I
M,N
, see par. 1-24 Motor
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 par. 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 par. 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 par. 2-01 DC Brake Current, once
activated.
2-03 DC Brake Cut In Speed [RPM]
Range: Function:
Application
dependent
*
[Application
dependant]
Set the DC brake cut-in speed
for activation of the DC braking
current set in par. 2-01 DC Brake
Current, upon a stop command.
2-04 DC Brake Cut In Speed [Hz]
Range: Function:
Application
dependent
*
[Application
dependant]
This parameter is for setting the
DC brake cut in speed at which
the DC braking current (par. 2-01)
is to be active, in connection with
a stop command.
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 installed.
[1] Resistor
brake
Brake resistor 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 Resistor brake function is only
active in frequency converters with an integral
dynamic brake.
[2] AC brake AC Brake will only work in Compressor Torque
mode in par. 1-03 Torque Characteristics.
2-11 Brake Resistor (ohm)
Range: Function:
Application
depend-
ent
*
[Applica-
tion
dependant]
Set the brake resistor value in Ohms.
This value is used for monitoring the
power to the brake resistor in
par. 2-13 Brake Power Monitoring. This
parameter is only active in frequency
converters with an integral dynamic
brake.
Use this parameter for values without
decimals. For a selection with two
decimals, use par. 30-81 Brake Resistor
(ohm).
Parameter Description
VLT
®
HVAC Drive Programming Guide
46 MG.11.CA.02 - VLT
®
is a registered Danfoss trademark
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