YOKOGAWA FC500G, Руководство пользователя, Страница: 34 / 41

<7. TROUBLESHOOTING>
7-1
IM 12F5A2-01E
7. TROUBLESHOOTING
If any operation abnormality appears, take measures using the following procedures.
Abnormalities Cause Countermeasures
No indication 1. The fuse is blown.
2. Converter connector poor contact
1. Replace the fuse.
2. Once turn OFF power and re-engage the
relevant connector.
Indication shows
hunting.
1. Poor contact in the indicator
(rotating) electrode mounting
position
1. Coat conductive grease (auxiliary).
Abnormal chlorine
concentration
displayed.
1. Poor contact of the electrode
terminals with connecting
leadwires
2. Miss-wiring of leadwires to be
connected to electrode terminals
3. Poor continuity between the
indicator (rotating) electrode and
the contactor
4. Deterioration of RTD insulation
5. Sample water flow rate is out of
range (0.1 to 2.5 l/min).
6. Calibrated value deviation
7. Electrical circuit failure
1. Correctly connect leadwires to the counter
electrode terminals (RE, T1, T2) and the
indicator electrode terminals (ME).
2. Check the leadwire symbols and correctly
connect the leadwires.
3. Clean the brush and the slip ring.
a. Adjust the brush contact pressure and
remove wear debris from the slip ring (see
subsection 8.2.6).
b. Replace the brush and slip ring (see sub-
section 6.1.3).
4. Disconnect leadwires to the counter elec-
trode terminals T1 and T2, and check that
the resistance across terminals T1 and T2
is approx. 1 kΩ at room temperature and
the resistance across the terminals RE and
T1 (or T2) is 1 MΩ or more. If these are not
satisfied, replace the counter electrode.
5. Adjust the flow rate. (Adjust so that
sample water just overflows the weir in the
measuring tank.)
6. Perform zero and span calibration.
7. Place the MEAS./CHECK selector switch
in CHECK position and check if the
display indicates 0.9 to1.1 mg/l. lf it is not
satisfied,contact Yokogawa.
Abnormal analog
output
1. The load resistance is larger than
500 Ω.
2. Electrical circuit failure
1. Adjust the load resistance to 500 Ω or less.
2. Contact Yokogawa.
The indicator
electrode does
not revolve or
irregularly rotates.
1. The belt is broken.
2. The motor fails.
3. The rotating shaft bearing has
corroded.
1. Replace the belt.
2. Replace the motor.
3. Replace the bearing.
Sample water
leakage
1. Drain cock is inadvertently not
closed.
2. Piping joint loosened.
1. Re-tighten the drain cock.
2. Re-tighten the piping joint fittings.