Danfoss VLT Brook Crompton Motor FCM 300 Design Manual page 55

Programming
Function:
[4] AC brake 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.
Illustration 3.21
Description of choice:
Select [4] AC brake if short-term generated loads occur.
3.5.2 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.
NOTICE
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
®
VLT DriveMotor FCM Series
the frequency set in parameter 404 Sleep frequency, the
timer is reset.
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MG03BA02 - VLT is a registered Danfoss trademark
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