On the basis of the determined inner dead bands Xi and the set hysteresis
(parameters Posit. hyst. OPEN M0598 or Posit. hyst. CLOSE M0599), the outer dead
bands X
T
are automatically determined.
This reduces the error caused by the overrun after only a few operations and a high
positioning accuracy is achieved.
Figure 35: Positioner positioning behaviour
E1 Setpoint
E2 Actual value
P1 Switch-on point
P2 Switch-off point in direction OPEN
P3 Setpoint reached
X
T
Max. error (outer dead band)
Xi
1
Overrun in direction OPEN (inner dead band OPEN)
Xi
2
Overrun in direction CLOSE (inner dead band CLOSE)
8.4.3. Overrun (inner dead band): set manually
The inner dead band determines the switch-off point of the actuator and, therefore,
influences the overrun.
The inner dead band may be set individually for the directions OPEN and CLOSE.
Manual setting is only possible if the adaptive behaviour, parameter Adaptive
behaviour M0147, is switched off.
Customer settings M0041
Positioner M0145
Dead band OPEN M0234
Dead band CLOSE M0235
Default values: 0.5 % (for dead band OPEN and CLOSE)
Setting ranges: 0.0 % to 10.0 % (for dead band OPEN and CLOSE)
Information
●
Inner dead bands may not be set wider than outer dead bands.
●
Inner dead bands may not be set too narrow as this may cause unnecessary
switching procedures (premature wear) or oscillation of the actuator.
.
8.4.4. Max. error variable (outer dead band): set manually
The outer dead band determines the switching-on point of the actuator.
The motor starts if the actual value (input signal E2) or a change in setpoint is higher
than the maximum error variable determined by the outer dead band.
52
Actuator controls
Application functions AC 01.2/ACExC 01.2 Profinet
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