5 System monitoring
26 Positioner DC 6-06
5.3.2 Monitoring the PWM setpoint
If the setpoint is connected to PWM input 1, a possible error in 3009
ErrFuelSetpPWMIn1 is activated, when connected to PWM input 3 on the other hand
the error 3011 ErrFuelSetpPWMIn3 is set. As with every other error, the common alarm
3801 CommonAlarm is simultaneously activated.
An error at the PWM setpoint generator is detected when signal 3500 FuelSetpPWMIn1
or 3504 FuelSetpPWMIn3 fails or when the frequency at 3501 FuelSetpFrequencyIn1 or
3505 FuelSetpFrequencyIn3 rises above 625 Hz or when a high-phase is measured
below the mean between 0 % and the lower reference or above the mean between the
upper reference and 100 % (
6.3.2 Error detection with the PWM inputs).
The particular error is automatically reset when the signal is back within the valid range
and the reset is permitted by 4332 FuelSetpHoldOrReset = 0.
Even if the value returns to within a valid range, the error remains continuously present
if the 'freeze' is requested with 4332 FuelSetpHoldOrReset = 1.
5.4 Monitoring the analogue stop signal
If the measured value of the analogue stop signal 3511 AnaStop_Value exceeds or falls
below the specified error limits 1512 AnaStop_ErrorLow and 1513 AnaStop_ErrorHigh
(
6.2.3 Error detection with the analogue inputs), the error 3005 ErrAnaStopRequest and
the common alarm 3801 CommonAlarm are activated simultaneously (
6.6 Common
alarm via alarm output).
As with the setpoint input, you can decide in the parameterization phase how the system
will respond to such an error.
4341 AnaStopSubstOrLast = 0
continue working with the last valid percentage
4341 AnaStopSubstOrLast = 1 continue working with 342 AnaStopSensorSubst
4342 AnaStopHoldOrReset =
0 when the measured value is back within the
permitted limits, reset the error and continue with
the valid value
4342 AnaStopHoldOrReset = 1 the error remains active until the control unit is
switched off or until an error reset, whether or not
the measured value comes back to within a valid
range
It should be remembered that error handling manipulates the percentage 2900
AnaStopSensor and that it therefore also indirectly affects 2809 AnaStopRequest - via the
thresholds, but does not directly affect the stop request.
An error is therefore automatically reset when the signal is back within the valid range and
the reset is permitted by 4849 AnaStopHoldOrReset = 0.
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