Behaviour in the event of mains switching, mains failure or controller inhibit
Start conditions/flying-restart circuit
10
Function library
10.5
10.5.1
L
10.5-2
EDS82EV903-1.0-11/2002
With the selection of the flying restart(C0143) you define whether the controller
searches for the motor speed after the restart or adds a signal.
Searching for the motor speed (C0143 = 0, C0143 = 1)
The drive starts if the momentary motor speed has been found. The acceleration
is steady and smooth
)
))
) Note!
l The flying-restart circuit must not be used if several motors with
different rotating masses are connected to a controller.
l The flying restart method is safe and reliable for drives with
great rotating masses.
l With machines with low moments of inertia and small friction,
the motor can restart for a short time or reverse after controller
enable.
l The controller only searches the given direction of rotation.
l The controller calculates the output frequency required for the current
speed of the idling motor, is connected and accelerates the motor until it
reaches its setpoint.
Adding a signal (C0143 = 2, C0143 = 3)
The controlleradds the output frequencycorresponding to the frequencysetpoint
or the actual process controller value.
)
))
) Note!
The actual process controller value must only be set if a
speed-proportional signal is available in C0412/5!
If the flying-restart circuit is not required forevery drive start, but only aftermains
reconnection:
l Bridge X3/28 with HIGH level and start the controller with the function “QSP”
(C0142 = 3 and C0106 = 0 s).
l The flying-restart circuit is now only activated for for the first mains
connection.
Flying restart
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