Toshiba LF494 - Manual (Page 134)

TOSHIBA
6F.8A0 7 74
Converter hardware failure
The system checks the internal circuitry at the time of power-up for all error items end
checks continuously for the specified items as described below, if an error is detected, one
of the messages shown in the table below will be displayed.
If multipJe errors occur, their messages will be displayed cyclically* The diagnostics items
concerning the excitation cable and excitation circuit are detected using the АПС circuit.
Thus, if the ADC fails, No. 4 (excitation cable) and No. 5 (excitation circuit) errors can
not be Jciccted correoily. Further, this entire checking system is based on the CPLi in the
llownieter. Therefore, if the CPU fails, no accurate diagnostics or error message display
can be obtained*
No. Error message Description Corrective action
1
t ROM ERROR * ROM error
Internal components or
printcd-circuit board must be
repaired or replaced.
Contact your nearest Toshiba
representative*
2
* RAM ERROR * RAM error
3 PARAMETER FAIL System parameter error
4 El CURR* OPEN
Excitation cables are not
connected, Connect the excitation cables
corre clly.
5 EL GURU ERROR
An error occurred in the
excitation circuit. Internal components or
prinled-circuit board must be
repaired or replaced.
Contact your nearest Toshiba
representative.
6 ADC. ERROR ADC error
7 INVALID TOTAL
Totalizer tala was destroyed
due to external noise. (No
message appears if totalization
is not used.) The error message disappears
if you press the reset key.
NOTES
T Errors No. 1 to No. 3 can be detected only at the tinte of power-up. llie flowmeter
does not start measurement if any one of these errors is delected. If these errors
occur after power-up, the flowmeter cannot detect these errors, and thus Eiiay
indicate and output incorrect data.
2. Errors No, 4 to No,
6
may not be delected even if the errors result in incorrect
flowmeter accuracy> because of characteristic differences in components used to
detect these errors.
3. CPU error cannot be deice led. If the CPU siop.s, the watchdog timer resets the
internal circuits and the flowmeter starts again from the initial power-up condition.
Depending on CPU condition, the flowmeter may not indicate and output correct
data.
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1 3 3
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