Toshiba L5232 manual Self-diagnosis error, 155

6F8A0917

Self-diagnosis error

The converter performs an operation check immediately after power is turned on and if an error is found, a self-diagnosis error is generated.

If more than one error occurs at the same time, the contents of those errors will be displayed cyclically. The diagnosis about excitation is carried out using the internal ADC function. Therefore, if an error of No.6 internal ADC occurs, Excitation wire of No.4 and Excitation circuit of No.5 cannot be diagnosed correctly.

In addition, since the entire checking system is based on the CPU, if the CPU fails, accurate diagnosis and indication cannot be obtained.

	No.	LCD display	Description	Corrective action
1		* ROM ERROR *	ROM error occurred	Internal parts or printed-circuit board must be
				repaired or replaced.
2		* RAM ERROR *	RAM error occurred
				Contact your nearest Toshiba representative.
3		PARAMETER	An error occurred in the internal
		FAIL	parameters in the memory
4		EX. CURR. OPEN	Excitation wires are not	Connect the excitation wires correctly.
			connected.
5		EX. CURR. ERROR	An error occurred in the	Internal parts or printed-circuit board must be
			excitation circuit.	repaired or replaced.
				Contact your nearest Toshiba representative.
6		ADC. ERROR	An error occurred in the ADC
			circuit
			Totalized data in the memory	The error message disappears if you press the
			was destroyed caused by the	reset key to clear the totalized data.
7		INVALID TOTAL	entry of noise.
			(No message appears if the data
			is not displayed in an indicating
			unit of totalization.)

Note 1: Diagnosis for No. 1, No.2 and No. 3 is performed only immediately after power is turned on. If any of these errors is indicated, the converter does not start measurement operation. If these errors occur after power is turned on, the converter cannot detect these errors. In addition, if this happen, the indication and output of the converter may become uncertain.

Note 2: Errors No. 4 to No. 6 may not be detected even if those errors cause accuracy problems because of the

characteristic variations in components constituting the circuits used for judgment standard to determine these errors.

Note 3: CPU error cannot be detected. If the CPU stops, the watchdog timer resets the hardware and the flowmeter starts again from the initial power-on condition. Depending on the condition of CPU error, the indication and output of the converter may become uncertain.

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