3 Function description
BU 0510 EN
technische Änderungen vorbehalten
23
3.7 Position
control
Position control works as a P-control circuit. Setpoint and actual positions are continuously compared with each
other. The setpoint frequency is determined by the multiplication of this difference with the parameter P611 "P pos.
control". The value is then limited to the "Maximum frequency" parameterised in parameter P105.
A path lead is calculated from the "Deceleration time" parameterised in parameter P103 and the actual speed.
Without the deceleration time being taken into account during path calculation, the speed is normally reduced too
late and the position is then overrun. Exceptions are highly dynamic applications with extremely small braking and
start-up times and applications where only small path increments are specified.
A start point for creep speed can also be set as another parameter in the parameter P612 "Pos. window". Within
this position window, the setpoint frequency is limited to the frequency set in parameter P104 "Minimum frequency".
This frequency value cannot undershoot 2 Hz. In applications with greatly varying loads and without speed control,
this parameter can be used to parameterise a creep path.
The parameter P612 "Pos. window" does not have an effect on the relay/output signal "Position reached".
Overview of position control:
Run with max.
frequency
Max.
Min.
Frequency
(*) Time determined by
"Pos. window"
Start-up
time
Run with min.
frequency
Time
Braking
time
(*)
P position control
