GE AF-650 GP Series, Programming Manual

Page: 129 / 175

3.20 B-## Brakes
Parameter group related to the brake features in the drive.
3.20.1 B-0# DC Brake
Parameters to configure the DC brake and DC hold
functions.
B-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 P-03 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
F-25 Start Function [0] or H-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.
B-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 P-03 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 B-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
B-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.
B-02 DC Braking Time
Range: Function:
10 s
*
[0 - 60 s] Set the duration of the DC braking current set
in B-01 DC Brake Current , once activated.
B-03 DC Brake Cut In Speed [RPM]
Range: Function:
0 RPM
*
[0 - 60000
RPM]
Set the DC brake cut-in speed for
activation of the DC braking current
set in B-01 DC Brake Current , upon a
stop command.
B-04 DC Brake Cut In Speed [Hz]
Range: Function:
0.0 Hz
*
[0 - 1000.0 Hz] Set the DC brake cut-in speed for
activation of the DC braking current set
in B-01 DC Brake Current , upon a stop
command.
B-05 Maximum Reference
Range: Function:
par. F-53 ReferenceFeed-
backUnit
*
[par. F-52 - 999999.999
ReferenceFeedbackUnit]
B-06 Parking Current
Range: Function:
50 %
*
[0 - 1000 %] Set current as percentage of rated motor
current, P-03 Motor Current . Will be used
when enabled in F-20 PM Start Mode .
B-07 Parking Time
Range: Function:
3 s
*
[0.1 - 60 s] Set the duration of the Parking Current set in
B-06 Parking Current , once activated.
3.20.2 B-1# Brake Energy Funct.
Parameters to configure the dynamic braking functions in
the drive. Note! This applies only to drives ordered with
the optional factory installed brake chopper option.
B-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
Parameter Descriptions AF-650 GP Programming Guide
128 DET-618C
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