6 Inputs and outputs
34 Positioner DC 6-06
The parameters 1512 AnaStop_ErrorLow or 1532 FuelSetAna_ErrorLow determine the
lower error limits that define when the minimum permissible value is undershot.
The parameters 1513 AnaStop_ErrorHigh or 1533 FuelSetAna_ErrorHigh determ
ine
the upper error limits that define when the maximum permissible value is exceeded.
It makes no difference whether the minimum or maximum value is assigned to the 0 %
or the 100 % value of the setpoint generator/sensor for referencing, only the value is of
interest, i.e. 0.5 V and 4.5 V for example.
Parameterization example:
The setpoint generator at analogue input 3 normally supplies a measured value
between 4 and 20 mA. These values are undershot or exceeded when a short or
open circuit occurs. The range below a measured value of 2.5 mA and above 21.5
mA is defined as inadmissible by the following parameters:
Number Parameter Value Unit
1530 FuelSetAna_Ref_0% 20 mA
1531 FuelSetAna_Ref_100% 4 mA
1532 FuelSetAna_ErrorLow 2.5 mA
1533 FuelSetAna_ErrorHigh 21.5 mA
4330 FuelSetpPWMOrAnalog 0
The error limits should not be too close to the minimum or maximum value to prevent
natural measured value fluctuations in the sensor resulting in an error detection.
Nevertheless a short or open circuit must be positively detected.
When an error is detected, the corresponding error parameter of the associated sensor is
set. The response to this error is described in Chapter
10.8 Error parameter list. If an
analogue input is not used, i.e. it is not assigned to any sensor, it is also not monitored
for errors.
6.3 Setpoint selection by PWM input
PWM input 1 is used for PWM setpoint selection if an analogue stop is not used, and
PWM input 3 if an analogue stop request has to be executed.
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