Fuji Electric ZSS-7, Instruction Manual

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INZ-TN7ZSS-E
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5.3.3.3 Alarm types
Following types of alarm are displayed.
All the alarms except “Connection Error” which indicates communication failure between the receiver unit
and the control unit will be activated after at least five minutes from the power off. The alarm of “Low Light
Transmission” is activated after 1 minute continuation. Though it takes 6 minutes from just after the power
on.
Alarm display Alarm contents Probable causes
LD Failure Laser is faulty • Failure caused by laser durability
LD Temp. Error Peltier which is cooling the laser
cannot control the set temperature. • Peltier failure
• Thermocouple failure
• The receiver unit and the transmitter
unit are used at an installation location
exceeding the set range.
The unit is used in an environment
where the temperature of transmitter
unit is higher than 55°C
•
The unit is used in an environment
where gas temperature is beyond the
specification.
Low Light Trans. Light quantity required for the
measurement cannot be obtained. • Light quantity is insufficient in an envi-
ronment with high dust.
• Light quantity is insufficient in an envi-
ronment with high water vapor.
• Contamination of window and conden-
sation are caused by insufficient air
purge.
• Optical path is blocked due to dust.
• Optical axis is deflected due to vibra-
tion.
• Optical axis is deflected due to distor-
tion of a stack.
• Optical axis is deflected due to external
faults.
Connection Error Communication between receiver
unit and transmitter unit does not
occur properly.
•
Break of wiring
•
Influence of high frequency noise
•
Poor contacts of the connector unit
•
CPU board failure
•
PD digital board failure
High Gas Temp. It is reported when exceeded gas
temperature is detected. • The actual gas temperature is more than
450°C.
• The value set to analog input on the
“Analog Input” screen is not correct.
Out of Range It is reported when exceeded gas
pressure is detected. • Actual gas pressure is outside the speci-
fication range.
• The value of the input range set on the
“Analog Input” screen is not correct.
AI Under Input channel on the “Analog In-
put” screen.
•
AI terminal is not connected to the ex-
ternal input device when channel setting
is set on the “Analog Input” screen.
• AI terminal and setting channel do not
match.
• Input is not 4 to 20mA DC.