Ulvac G-Tran ISG1, Инструкция по эксплуатации

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23. TROUBLESHOOTING
Possible causes of malfunction of this unit include erroneous electric wiring. If any trouble is
suspected, check the following.
(1) Wiring between the display unit and sensor unit
(2) Wiring between the display unit and remote host
(3) Short/open signal
Refer to the troubleshooting chart below after checking these. The arrow mark [
→
] in the
corrective action column represents the reference page.
Turn off the power before making these checks.
①
No display appears when power is turned on.
Possible cause Corrective action
Erroneous wiring or disconnection of the
power supply cable Correct the wiring and check continuity using a
circuit tester.
Line voltage is below the specified range. Check the line voltage using a voltmeter. Line
voltage is to be within 24 V
±
1V.
CPU has run out of control because of
external noise. Turn on the power again to start up CPU again.
Corrective measures against noise should be taken
otherwise.
Internal fuse has blown out. Check and/or repair at ULVAC are necessary.
Failure of display unit indicating circuit. Check and/or repair at ULVAC are necessary.
Failure in the display unit circuit. Check and/or repair at ULVAC are necessary.
②
Pressure has changed, but the segment indication remains constant.
Possible cause Corrective action
Pressure is below the measurement range. Normal
Erroneous wiring between sensor unit and
display unit (pressure signal is not input to
the display unit) or wiring is broken. Correct the wiring and check continuity using a
circuit tester or other.
Cable connecting the sensor unit and the
sensor head is disconnected (when the box
unit is used). Reconnect the cable and fix it securely.
Line voltage is too low. Check the line voltage using a circuit tester. (Line
voltage: 24 V
±
1 V)
③
[FU LL] is not displayed under atmospheric pressure
Possible cause Corrective action
The sensor head or cable length differs from
the specified one. Change it with a specified one or recalibrate it with
the current one.
→
Refer to the sensor unit manual
Gas under measurement is not air.
Normal
→
Refer to the sensor unit manual
Gas under measurement is air, but it contains
much water and/or oil.
Normal
→
Refer to the sensor unit manual