D135-10-880C - Troubleshooting
Page 95
Troubleshooting
The ELD500 is equipped with comprehensive self-diagnostic facilities. If an error or warning
condition is detected it is indicated via the LC display to the operator.
An audio signal is generated when an error or warning occurs. The frequency changes every
400 ms from 500 to 1200 Hz and vice versa so that the signal stands out well from ambient
noises normally encountered.
Error and warning messages are logged and can also be displayed at a later time through the
menu information (refer to Information.)
Hints for troubleshooting
Warnings will be indicated:
when the ELD500 detects an abnormal condition, or
when it wants to remind the operator of something (for example, a request for
calibration or a service timer has expired).
The ELD500 will indicate a message on the LC display and will remain in the standby or the
measurement mode.
Warning messages will remain on the LC display until the warning has been acknowledged by
pressing OK (Softkey no. 8). After that the ELD500 can be used again (possibly with some
restrictions). As long as a warning status exists the status line shows a warning triangle.
Errors are events which force the ELD500 to interrupt its measurement operations. In this
case the ELD500 closes all valves except valve 2a (standby mode).
Error messages remain on the LC display until the message has been acknowledged by
pressing Restart (Softkey no. 8). After that, the ELD500 restarts with a new run-up procedure.
In some cases it may be helpful to check some settings or measured values before the ELD500
restarts. Therefore it is also possible to press Menu (Softkey no. 4 or Menu key) to enter the
ELD500 menu. After leaving the menu the same error message will be displayed again.
Under extreme conditions (unknown software errors, excessively high electromagnetic
interference levels) the built-in Watchdog circuit will prevent uncontrolled operation of the
ELD500. This Watchdog will cause the ELD500 to restart. After having done so, the instrument
will be running in the standby mode. No error message will be output.
List of errors and warnings
The following pages contain a list of all errors and warnings displayed at the control panel.
Warning messages are indicated by numbers with a leading W. Error messages are indicated
by numbers with a leading E.
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