<8. TROUBLESHOOTING>
8-3
IM 12E04A02-02E
9th Edition : Mar. 16, 2018-00
(6) Err16 (RAM failure)
A failure of the IC (RAM) used for the computation buffer is assumed.
Requ
est checking and/or repair of the converter CPU board.
Note: Err16 is detected only when the power is turned on. All functions of the converter are suspended when a failure occurs.
(7) Err17 (EEPROM failure)
A failure of the data memory IC (EEPROM) is assumed.
Re
quest checking and/or repair of the converter CPU board.
Note: Err17 is detected only when the power is turned on. All functions of the converter are suspended when a failure occurs.
(8) Err18 (reference signal voltage failure)
Operation and checking procedure
Failure Mode and Corrective Action
Measure the DC voltage across the converter
connection terminals [S2(+) and AG(-)]. Confirm that it
is lower than about -2.45 V or it is higher than +0.5 V.
A failure of the control preamplifier in the converter is
assumed.
=> Request checking and/or repair of the control
preamplifier.
(9) Err25 (lamp service life ended)
Operation and checking procedure
Failure Mode and Corrective Action
Measure the DC voltage across the converter
connection terminals [P1(+) and P2(-)]. Confirm that it
is about 4.8 V *1.
The lamp brightness decreases and the lamp voltage
shows the upper control limit (about 4.8 V *1).
=> Replace the lamp with the spare lamp.
*1:
If the program version number is 1.08, the upper limit is set to 4.1 V. (The version number can be confirmed in FUNCTION "E" in
<MAINT.> mode. Refer to Subsection 6.5 (13)).
Note: If the lamp life alarm occurs, turbidity measurement does not immediately become impossible.
If the lamp life alarm occurs, since the lamp voltage is fixed at about 4.1 V, turbidity measurement can be contained in this state.
However, since the lamp voltage is not controlled, measurement error gradually increases. Thus, replace the lamp as soon as
possible.
NOTE
After replacing the lamp, perform running-in for an hour or more and then perform lamp control
reference value calibration and turbidity span calibration.
(10) Err26 (automatic calibration failure)
In automatic zero calibration, the zero-calibration permissible range is exceeded. The cause
is assumed to be a failure in the operation of the motor-operated drain valve (SV1) or motor-
operated measuring water valve (SV3), clogging of the piping between the detector and the head
tank, etc.
Operation and checking procedure
Failure Mode and Corrective Action
1
Select the <MAINT.> mode and check the open/shut
operations by turning valves SV1 and SV3 on and off
.
2
If the valve(s) does(do) not operate properly, turn
off the power to the converter one time and remove
the motor-operated valve wiring from the converter
connection terminal board (Table 8.1).
3 Turn on the power again and check whether the
valve driving voltage (power voltage) appears
across the terminals by doing an on/off operation
using the SV key (Table 8.1).
(a) If the normal driving voltage is not output, a failure
of the valve driving circuit on the converter analog
board is assumed.
=> Request checking and/or repair of the analog
board.
(b) If the normal driving voltage is output, a failure of
the motor-operated valve(s) is assumed.
=> Replace the motor-operated valve(s) with good one(s).
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