<9. Troubleshooting>
9-10
IM 12F4A1-01E
9.3
Other Failures
9.3.1
Analog Output does not Correspond to Indicated
Value.
When analog output is abnormal whereas the display of residual chlorine concentration is
normal, output circuit may have failed.
When an output range of 4 to 20 mA is used, confirm that load resistance is 550 Ω or less.
9.3.2
Cleaning is not Conducted Properly.
This problem may appear when the RC400G-2 or RC400G-3 is used.
When a symptom possibly caused by malfunctioning of the solenoid valve is observed, e.g.
irregular cleaning of the “measuring tank/sand filter cylinder” or evidence of cleaning water mixing
into sample water; check the operation of each solenoid valve in <MAINT.> mode.
Perform operation checking by operating each one of each “Operation command keys -2”
corresponding to each solenoid valve.
When a solenoid valve does not work at all, check with a multimeter if the supply voltage for
operating the solenoid valve is applied to the connecting terminals when the operation command
is sent.
If the voltage is applied by operation command, the cause of malfunctioning is on the solenoid
valve side.
Replace the solenoid valve after checking that wiring connection is not the cause of the failure.
Replace the solenoid valve also when cleaning water enters the measuring tank or the sand filter
even the solenoid valve is not working.
The cycle of automatic zero calibration may coincide with that of cleaning. If so, automatic zero
calibration will take precedence. Change either cycle.
9.3.3
“Remote” Range Switching does not Work.
This failure occurs when output range switching is performed in “Remote” position.
When the range is not switchable by the range switching command, check if the command signal
(resistance of input contact) meets requirements. (Refer to subsection 3.3.3.)
14th Edition : Jul. 15, 2020
Содержание RC400G
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