6 Inputs and outputs
36 Positioner DC 6-06
Parameterization example 2:
The setpoint generator selects the filling setpoint with a PWM ratio of between
10 % and 90 %. The analogue stop request is needed, so the PWM setpoint is
automatically expected at PWM input 3 on Pins 11 and 12.
Number Parameter Value Unit
1504 FuelSetPWMIn3RefLow 10 %
1505 FuelSetPWMIn3RefHigh 90 %
1508 FuelSetPWMIn3_Filter 8
4330 FuelSetpPWMOrAnalog 1
4340 AnaStopRequestUsed 1
6.3.2 Error detection with the PWM inputs
The following error causes are detected at PWM inputs and displayed as an error on the
assigned sensor:
- The PWM signal has failed
- The frequency is 25 % higher than the maximum permitted frequency of 500 Hz. In
this case the PWM input is deactivated to minimise the interrupt load on the control
unit
- The PWM ratio is outside the error limits which correspond to half the
lower reference parameter (parameter from 1500 FuelSetP
WMIn1RefLow) or the
mean between the upper reference parameter (parameter from 1501
FuelSetPWMIn1RefHigh) and 100 %.
6.4 Actuator position output with analogue output
The current actuator value can be output as a current on the port at Pin 1 and 3 when
4335 ActPosOutPWMOrAnalog = 0 is set.
Output Use Name Terminal Specification
Analogue output 2
*
Current actuator value P2 1, 3 0..22 mA
*
optional PWM output
Table 12: Analogue output
6.4.1 Value range of the analogue output
For the current output it is usually not the maximum output range of approx. 0..22 mA
that is desired but the standard output range of 4..20 mA.
Parameters 1646 CurrentOut_RefL
ow and 1647 CurrentOut_RefHigh are provided for
matching the output range. The value to be entered is directly parameterized in electrical
unit.
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