VLT
®
FCM Series
400 Brake functions
(BRAKE FUNCTIONS)
Value:
OFF (OFF)
[0]
AC brake (AC BRAKE)
[4]
Function:
AC brake
[4] can be selected to improve braking. With
the new AC brake function it is possible to control
the time of increased motor losses, still protecting
the motor thermally. This function will yield a braking
torque between 80 and 20 % in the speed range
up to base speed (50 Hz). Above base speed the
extra braking will gradually disappear.
Description of choice:
Select
AC brake
[4] if short-term generated loads occur.
■
Sleep mode
Sleep mode makes it possible to stop the motor
when it is running at low speed, similar to a no
load situation. If consumption in the system goes
back up, the frequency converter will start the
motor and supply the power required.
NB!:
Energy can be saved with this function,
since the motor is only in operation when
the system needs it.
Sleep mode is not active if
Local reference
or
Jog
has been selected
The function is active in both
Open loop
and
Closed loop
.
In parameter 403
Sleep mode timer
, the Sleep mode is
activated. In parameter 403
Sleep mode timer
, a timer
is set that determines how long the output frequency
can be lower than the frequency set in parameter
404
Sleep frequency
. When the timer runs out, the
frequency converter will ramp down the motor to stop
via parameter 208
Ramp-down time
. If the output
frequency rises above the frequency set in parameter
404
Sleep frequency
, the timer is reset.
✭
= factory setting. () = display text [] = value for use in communication via serial communication port
MG.03.H3.02 - VLT is a registered Danfoss trademark
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