Configuration
Function blocks
Internal motor control with V/f characteristic control (MCTRL1)
8
8.2
8.2.6
8.2-36
EDSVF9333V EN 3.0-06/2005
The flying restart circuit i s especially suitable for applications with fan and
drives with great mass inertia.
The flying restart circuit serves to enable the controller although the motor
still rotates. The flying restart circuit automatically detects the current
motor speed using this speed to start the motor control. This prevents the
motor from braking to zero speed with subsequent acceleration.
Use C0140 to determine the search direction during the flying restart
process.
ƒ If the direction of rotation of the coasting machine is known, you can
search in the direction of rotation or in the direction of the applied
setpoint.
ƒ If the direction of rotation of the coasting machine is not known, you
can search in both directions of rotation or in both directions of the
applied setpoint.
In case of applications with fan, for example, search is possible in both
directions if the direction of rotation of the free-running fan impeller is
not known due to the air flow.
Note!
ƒ The flying restart circuit is optimised for a power-adapted
motor. Thus, the rated motor current should not exceed the
rated controller current.
ƒ Althoughtheflyingrestartcircuitisactivated(C0142=2or
C0142 = 3), the flying restart process does not start if the pulse
inhibit is deactivated again after an OU message.
In order that the flying restart process starts, connect e.g. the
input DCTRL-CINHx with the output signal MONIT-OU. An OU
message causes an internal controller inhibit. When the
controller inhibit is deactivated, the flying restart process is
started.
Automatic speed detection
after controller enable - flying
restart circuit
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