13 Error Handling
KRONOS 20
53
13
Error Handling
13.1
General
The HEINZMANN Digital Controls of the KRONOS 20 series include an integrated error
monitoring system by which errors caused by sensors, speed pickups, etc., may be detected
and reported. By means of a permanently assigned digital output the error types can be
output via some visual signal.
The different errors can be viewed by the parameters 3001..3094. A currently set error pa-
rameter will read the value “1”, otherwise the value “0”.
Generally, the following errors types can be distinguished:
Errors in configuring the control and adjusting the parameters
These errors are caused by erroneous input on the part of the user and cannot be in-
tercepted by the HEINZMANN diagnosis tool. They do not occur with controls
from series production.
Errors occuring during operation
These errors are the most significant ones when using governors produced in series.
Errors such as failure of the speed pickups, setpoint adjusters, pressure and tem-
perature sensor or logical errors such out of tolerance conditions.
Internal
computational
errors of the control
These errors may be due to defective components or other inadmissible operating
conditions. Under normal circumstances, they are not likely to occur.
To cancel an error one should first establish and eliminate its cause before clearing any of
the current errors. Some errors are cleared automatically as soon as the failure cause has
been eliminated. Errors can be cleared by means of the PC, by the Hand Held Programmer
or, if accordingly configured, by the digital input 2828
SwitchErrorReset
. If the system
does not stop reporting an error, the search for its cause must go on.
Principally, the control starts operating on the assumption that there is no error and will
only then begin to check for possible occurrences of errors. This implies that the control
can be put into an error free state by a Reset of Control Unit, but will immediately begin to
report any errors that are currently active.
13.2
Categories of Errors und Emergency Operation after System Failure
There are two categories of errors. One category comprises errors that permit of maintain-
ing engine operation though functionality will in some cases be restricted (e.g., warnings,
sensor failures for pressure, temperature, output power). A parametrized substitute value
for the failed sensor can be set and will influence the behaviour of the emergency opera-
tion.
Summary of Contents for E-LES 30
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