Fuji Electric ZKMA, Инструкция по эксплуатации

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- 49 - INZ-TN2ZKMA-E
9.5 Troubleshooting
Phenomena Probable causes Checking methods (normal value) Remedy
No display Converter fuse blown out Check the fuse and supply voltage speci-
fication. Replace fuse Check
Power supply voltage
Indication does
not change or
slow response Filter and/or flow guide tube
clogged Visual check of filter and flow guide
tube for contamination or clogging.
Check for loosen and gas leaks at piping
connections and mounting place of de-
tector. Clean or replace filter
Tighten pipe connec-
tions
Sensor deterioration Change over between zero and span gas
and check if 5 minutes or longer is need-
ed for 90% response. Replace sensor
Decrease in flow velocity of
exhaust gas Check response to process gas after
shutting down calibration gas.
Move the direction (mounting position)
of “arrow” of the flow guide slightly. Increase process gas
Flow into the flow
guide tube.
Temperature
alarm contin-
ues for more
than 10 min.
after power
switched ON Break of wiring
Wrong wiring
Source voltage is too low. Cable check of wiring
Wiring check
Check of supply voltage specification Replacement
Correct wiring
Check power supply
Break of thermocouples Break check Replace sensor
Blown heater fuse Cable check of fuse Replace fuse
Break in detector heater Check heater resistance
50 to 55
Ω
for 115V, 200 to 250
Ω
for
220V (Excluding wiring resistance)
Replace sensor
Automatic
calibration is
not possible Difference between calibration
gas concentration and its setting Check the set value for calibration gas
concentration. Set proper value (Re-
fer to “10.2.7”)
Wrong parameters setting Check automatic calibration intervals. 
Set proper parame-
ters
The calibration is prohibited in
the contact input of the external
terminal block. Check if the calibration is not prohibited
in the contact input of the external ter-
minal block.

Set proper parame-
ters

Correct wiring
The heater is set to off at the
contact input of the external
terminal block. Check if the heater is set to off at the
contact input of the external terminal
block.

Set proper parame-
ters

Correct wiring
Zero and/or
span alarm Difference between calibration
gas concentration and its setting
or misconnection between zero
and span gas Check the set value for calibration gas
concentration.

Set proper value
Check piping.

Correct wiring
Indication too
high or too low Loose flange and its surround-
ings Deteriorated O-rings Check for gas leaks in detector and
mounting part of flow guide tube flange.

Tighten mounting
screws

Replace sensor
Check for leaks from the outside. 
Seal
Detector is faulty. Check for gas leaks at calibration gas
inlet.
Check sensor voltage (mV) for higher or
lower than other detector when flowing
zero gas. (See “6.5 Oxygen detector
standard output voltage”)

Tighten connectors

Replace sensor
Abnormal detector temperature Refer to check items for detector tem-
perature alarm described above.

Replace sensor
Indication difference between
dry and wet base measurement Oxygen concentration is higher in dry
base.

Normal
Unstable read-
ings The power supply voltage is too
high or too low. Check that the supplied voltage is as
specified.

Auto-tuning