Danfoss VLT AutomationDrive FC 302 Programming Manual page 60

Parameter Descriptions
2-03 DC Brake Cut In Speed [RPM]
Range:
Size related
*
RPM]
3 3
2-04 DC Brake Cut In Speed [Hz]
Range:
Size related
*
Hz]
NOTICE
Parameter 2-04 DC Brake Cut In Speed [Hz] has no effect
when 1-10 Motor Construction = [1] PM, non salient SPM.
2-05 Maximum Reference
Range:
Size [ par. 3-02 -
related 999999.999
*
ReferenceFeed-
backUnit]
2-06 Parking Current
Range:
50 % [ 0 - 1000
*
%]
2-07 Parking Time
Range:
3 s [0.1 - 60 s] Set the duration of the Parking Current set in
*
3.4.2 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:
[0] Off
58
Function:
[ 0 - 60000 Set the DC brake cut-in speed for
activation of the DC braking current
set in parameter 2-01 DC Brake
Current, upon a stop command.
Function:
[ 0 - 1000.0 Set the DC brake cut-in speed for
activation of the DC braking current
set in parameter 2-01 DC Brake
Current, upon a stop command.
Function:
This is an access parameter to
parameter 3-03 Maximum Reference
for legacy products. The maximum
reference is the highest value
obtainable by summing all
references. The maximum reference
unit matches the choice of configu-
ration in
parameter 1-00 Configuration Mode
and the unit in
parameter 3-01 Reference/Feedback
Unit.
Function:
Set current as percentage of rated motor
current, parameter 1-24 Motor Current. Is
used when enabled in parameter 1-70 PM
Start Mode.
Function:
parameter 2-06 Parking Current, once activated.
Function:
No brake resistor is installed.
®
VLT AutomationDrive FC 301/302 Programming Guide
2-10 Brake Function
Option:
[1] Resistor
brake
[2] AC brake Is selected to improve braking without using a
2-11 Brake Resistor (ohm)
Range:
Size
related
*
2-12 Brake Power Limit (kW)
Range:
Size
related
*
MG33MI02 - Rev. 2013-11-20
Function:
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 resistor brake function is only active in
frequency converters with an integral dynamic
brake.
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
the braking torque without exceeding the over
voltage limit.
NOTICE
The AC brake is not as efficient as dynamic
braking with resistor.
plus
AC brake is for VVC mode in both open
and closed loop.
plus
AC brake is for VVC and flux mode in both
open and closed loop.
Function:
Set the brake resistor value in Ω. This
[ 5.00 -
65535.00
value is used for monitoring the power
Ohm]
to the brake resistor in 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 2 decimals,
use parameter 30-81 Brake Resistor (ohm).
Function:
[ 0.001 - Parameter 2-12 Brake Power Limit (kW) is
2000.000 the expected average power dissipated in
kW] the brake resistor over a period of 120 s.
It is used as the monitoring limit for
16-33 Brake Energy /2 min and thereby
specifies when a warning/alarm is to be
given.
To calculate parameter 2-12 Brake Power
Limit (kW), the following formula can be
used.
U br 2 V × t br s
P br,avg W =
R br Ω × T br s
P is the average power dissipated in
br,avg
the brake resistor, R is the resistance of
br