Danfoss VLT Midi Drive FC 280 Programming Guide

4.3 Parameters: 2-** Brakes
2-00 DC Hold/Motor Preheat Current
Range: Function:
50 %
*
[0 -
160 %]
Set the 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
parameter 1-72 Start Function, or if [1] DC hold/pre-
heat is selected in parameter 1-80 Function at
Stop.
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 %]
NOTICE
The maximum value depends on the rated
motor current. Avoid 100% current for too
long. It may damage the motor.
Set current as % of rated motor current,
parameter 1-24 Motor Current. When speed is
below the limit set in parameter 2-04 DC Brake Cut
In Speed, or when the DC-brake inverse function is
active (parameters 5-1* Digital Inputs set to [5] DC-
brake inverse; or via the serial port), a DC-brake
current is applied on a stop command. See
parameter 2-02 DC Braking Time for duration.
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.
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.
2-10 Brake Function
Option: Function:
[0]
*
O No brake resistor is installed.
[1] Resistor
brake
A brake resistor is incorporated in the system for
dissipating 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 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 braking
torque without exceeding the voltage limit.
NOTICE
The AC brake is not as ecient 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. Parameter 2-11 Brake
Resistor (ohm) is only active in frequency
converters with an integral dynamic brake.
Use this parameter for values without
decimals.
2-12 Brake Power Limit (kW)
Range: Function:
Size
related*
[0.001 -
2000
kW]
Parameter 2-12 Brake Power Limit (kW) is the
expected average power dissipated in the
brake resistor over a period of 120 s. It is
used as the monitoring limit for
parameter 16-33 Brake Energy Average and
species when a warning/alarm is given.
Parameter Descriptions
VLT
®
Midi Drive FC 280
40 Danfoss A/S © 12/2015 All rights reserved. MG07C102
44

Danfoss VLT Midi Drive FC 280 Specifications

General

Brand	Danfoss
Model	VLT Midi Drive FC 280
Category	DC Drives
Language	English