5
ANTRIEBSTECHNIK
6
65
KEB COMBIVERT F4-F
Name: Basis
08.03.99
6
Section PageDate
© KEB Antriebstechnik, 1999
All Rights reserved
Chapter
Functional DescriptionKeep on Running Functions
6.6.4 Automatic Restart
and Speed Search
Fig. 6.7.4.a Parameter survery speed search
With automatic restart the inverter can reset errors automatically. The function can
be activated separately for different errors with Pn.0 and Pn.1.
Because of the automatic restart of the machine corresponding protective
measures must be provided for the operating personnel and the machine.
The function speed search reduces the torque impulse that occurs when switching
onto a coasting motor. After the function is activated by selecting the starting condition
(Pn.7), the ramp starts with the actual motor speed and accelerates the drive with the
adjusted ACC-ramp to the setoint value. At disabled speed search the ramp starts
with the setpoint value 0. This means, the drive is decelerated with max. torque and
then accelerated again. The function works only in controlled operation (CS.23=1).
Fig. 6.7.4.b Principle of speed search
1) Normal operating state
2) Modulation disabled => Motor decelerates
uncontrolled
3) Modulation enabled again => the setpoint speed
increases corresponding to the adjusted acceleration
ramp and starts with n
soll
= n
ist
.
1) Normal operating state
2) Modulation disabled => Motor decelerates
uncontrolled
3) Modulation enabled again => The setpoint speed
increases corresponding to the adjusted acceleration
ramp starting with n
soll
= 0. At that the motor is
decelerated with max. torque until the actual speed
has reached the setpoint speed. Afterwards it is
acclerated to the setpoint speed.
n
t
1 2 3
n
t
1 2 3
Speed search active Speed search not active
n
ist
n
soll
Pn.0 automatic retry UP
0=off 1=on
Pn.1 automatic retry OP
0=off 1=on
terminal strip
switch on
terminal strip
Pn.7 Startbedingung
0 off
1 control release
2 power on
4 reset
8 automatic reset
speed search
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