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 %* [ 0 -
160. %]
Enter a value for holding current as a
percentage of the rated motor current I
M,N
set
in 1-24 Motor Current. 100% DC holding current
corresponds to I
M,N
.
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
%*
[ 0 -
1000. %]
Enter a value for current as a percentage of the
rated motor current I
M,N
, see 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 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.
2-03 DC Brake Cut In Speed [RPM]
Range: Function:
Size related* [ 0 - 60000.
RPM]
Set the DC brake cut-in speed for
activation of the DC braking
2-03 DC Brake Cut In Speed [RPM]
Range: Function:
current set in 2-01 DC Brake
Current, upon a stop command.
2-04 DC Brake Cut In Speed [Hz]
Range: Function:
Size related* [ 0.0 - 1000.0
Hz]
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.
2-06 Parking Current
Range: Function:
50 %* [ 0 - 1000. %] Set current as percentage of rated motor
current, 1-24 Motor Current. Will be used
when enabled in 1-70 PM Start Mode.
2-07 Parking Time
Range: Function:
3.0 s* [0.1 - 60.0 s] Set the duration of the Parking Current set
in 2-06 Parking Current, once activated.
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: 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 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
plus
and flux mode in both
open and closed loop.
Parameter Descriptions
VLT
®
AutomationDrive Programmming Guide
MG33ME02 - VLT
®
is a registered Danfoss trademark 51
3
3
To Next Page
Loading...
