YOKOGAWA RC400G, User Manual

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<9. Troubleshooting>
9-2
IM 12F4A1-01E
Confirmation Method
Check <PUMP>
lamp is lit.
Check with a tester
that setup voltage is
imposed between the
connecting terminals
P1 and P2.
Disposition
Check visually the
operation of the
metering pump.
Confirm there is no
liquid leak from the
bottom hole of the
metering pump body.
End
Turn on the pump by pressing [PUMP] key.
(<PUMP> lamp is lit.)
The relay in the converter may be defective.
If defective, replace the relay.
Defective motor or loosened motor wiring is
the cause of the failure. If defective, replace
the motor. Turn off power supply to the
converter before checking the wiring.
Start
Is pump ON?
Is terminal
voltage normal?
Is motor turning?
Any leak from
pump?
Adjust flow rate
referring to
subsection 8.8.
Is it adjustable?
Deterioration of “Bellofram” or valve sheet is
the cause of the failure. Replace the defective
part referring to subsection 8.7.
NO
NO
NO
YES
NO
YES
YES
YES
YES
NO
F9.1.ai
Figure 9.1 Metering Pump Inspection Flow Chart
(3) Error code “Err21” (zero point failure):
Carry out the inspections described below in accordance with the zero calibration method.
<Open input circuit method>
Confirm that the space between the indicator electrode (rotating gold alloy electrode) and
the counter electrode is completely open.
<Chlorine-free water method>
(a) Check by amperometric titration, etc. that the zero calibration liquid in use is chlorine-free
water.
(b) Confirm that reagent is present in the reagent tank.
(c) Confirm the operation of the metering pump following the inspection flow chart shown in
Figure 9.1.
14th Edition : Jul. 15, 2020