13 Error Handling
54 KRONOS 20
The other category consists of what are called fatal errors that will cause a emergency
shutdown of the engine (e.g., overspeeding, failure of both speed pickups) or a emergency
operation. Has a fatal error occured the system tries to set the gas valve to a parametrized
fixed position or to keep the actual valve position. In this case the emergency operation
mode is equivalent to a mechanical system using a main adjusting screw
The parametrization of the system behaviour at the occurrence of fatal errors is made by:
319
StepperPosSubst Substitute value for valve position
4319
SubstOrLastStepprPos = 1 Substitute value will be used or
4319
SubstOrLastStepprPos = 0 last valve position will be kept
The emergency shutdown of the engine can be achieved by setting the substitute value for
valve position to „0“ and using this position on occurrence of error.
These error categories are sigalled by the following tow parameters
3800
EmergencyAlarm Emergency alarm
3801
CommonAlarm Common alarm
The parameter 3801
CommonAlarm will be set on the occurrence of any error, 3800 Emer-
gencyAlarm only for fatal errors Thus, 3800 EmergencyAlarm will never occur alone by it-
self.
For the further external use or visualization of the failure status the value of the common
alarm is permanently assigned to Pin 10 of the control unit.
As to the common alarm, there also exists the option to make the output blink at a fre-
quency of 1 Hz for identifying warnings. For this purpose, the parameter
5101
CommAlarmWarnFlashOn = 1
is to be set. As soon as any true error (no warning) is coming in, he common alarm will be
continuously active.
The common alarm output can also be configured such that the output is reset for
0.5 seconds on the occurrence of any new error. An SPS connected to the output will thus
be able to detect the new error. For this configuration, the parameter
5102
CommonAlarmResetOn = 1
should be set and the above function disabled (5101
CommAlarmWarnFlashOn = 0).
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