Moeller Rapid Link, Switching And Installation System, Page: 133 / 162

01/08 AWB2190-1430GB
Description of parameters
applicable to RA-SP
129
F-20 DC braking
DC braking for decelerating the motor is activated automatically
when the frequency falls below the value set with PNU A52.
By applying a pulsed DC voltage to the motor stator, a braking
torque is induced in the rotor and acts against the rotation of the
motor. With DC braking, a high level of stopping and positioning
accuracy can be achieved.
Under PNU A51, specify whether DC braking is used.
Under PNU A52, enter the frequency at which DC braking is
activated.
Under PNU A53, enter the waiting time which is to elapse before
DC braking becomes active when the set startup frequency is
reached.
Under PNU A54 enter the braking torque between 0 and 100 %.
In PNU A55, enter the DC braking duration.
Actuation for spring-applied brake with DC air magnet
Connection a page 100
By default, the RA-SP…341/343 activates the brake during motor
operation. As long as the motor is driven at a frequency higher
than 0 Hz, the brake is disengaged. Do not change this setting if
possible.
In specific cases it may be necessary to release the brake with a
delay or actuate it prematurely, for example to compensate for
delayed brake engagement caused by a rectifier built into the
motor’s terminal board. This setting can be parameterized.
Set brake actuation through digital output 11. By default, this
output is active during motor operation: operating mode RUN.
Alternatively you can actuate digital output 11 through the
frequency value signal: operating mode FA2,
a page 130.
In operating mode FA2 fixed frequency stage 0 must be set
digitally with F01&A20,
a table 29 on page 128. This setting
can not be made with a potentiometer.
Table 30: Parameterizing digital output 11 (brake actuation, RA-SP…341/343)
h Caution!
DC braking results in additional heating of the motor. You
should therefore configure the braking torque (PNU A54)
as low and the braking duration (PNU A55) as short as
possible.
PNU Designation Adjustable in
RUN mode Value Function FS
A51 DC braking active/
inactive – 00 Automatic DC braking disabled 00
01 Automatic DC braking activated
A52 DC braking starting
frequency 0.5 to 10 Hz When PNU A51 is set to 01, DC braking is activated when the
actual frequency falls below the frequency entered here. 0,5
A53 DC braking waiting
time 0.0 to 5 s When the frequency set with PNU A52 is reached, the motor
coasts for the time duration entered here before DC braking is
activated. 0.0
A54 DC braking torque 0 to 100 % Adjustment range for the level of braking torque. 0
A55 DC braking duration 0.0 to 60 s The time during which DC braking is active. 0,0
h To prevent wear and excessive heating of the brake, keep
motor operation times with engaged brake as short as
possible.
PNU Digital output Value Function Description FS
C21 11 00 RUN Signal during motor operation 00
02 FA2 Frequency exceeded