Heinzmann Programmer 2 Manual page 40

7 Error Handling
sensor failures). The other category consists of what are called fatal errors that will cause
emergency shutdown of the engine (e.g., overspeeding, failure of both speed pickups).
These error categories are signalled by the following two parameters:
3800 EmergencyAlarm
3801 CommonAlarm
The parameter 3801 CommonAlarm will be set on the occurrence of any error, 3800
EmergencyAlarm only for fatal errors. Thus, 3800 EmergencyAlarm will never occur alone
by itself.
These two parameters are ouput each to a permanently assigned digital output in order to
enable signalization of the error state. The emergency alarm is usually output inverted
(low-active) and interpreted as the signal "Governor ready" which would also signal a fatal
error in case of missing power supply.
With this assignment, the outputs are to be interpreted as follows:
Status „Common alarm"
not active
not active
active
active
The "Governor ready" output, i.e., the inverted emergency alarm signal, is usually used to
activate the overspeed protection device.
As to the common alarm, there also exists the option to make the output blink at a
frequency of 1 Hz for identifying warnings (e.g., for speed dependent oil pressure
monitoring or coolant temperature warning). For this purpose, the parameter 5101
CommAlarmWarnFlashOn is to be set to "1". 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 should be set to "1" and the above function disabled (5101
CommAlarmWarnFlashOn = 0).
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Emergeny alarm
Common alarm.
Status „Governor ready"
not active
active
not active
active
Signification
no power supply
no error
emergency alarm
common alarm
Programmer PG 02