Yokogawa Touch Screen GP20 - Manual (Page 375)

5-21
IM 04L51B01-01EN
Maintenance and T
roubleshooting
1
2
3
4
5
App
Does the input meet the
specifications? NO
NO
NO
NO
NO
YES
YES
YES
YES
• The error is large.
• The trend or digital values fluctuate.
• The trend is off the scale on either the 0% or 100% side.
YES
• Adjust the span and range (Sec. 1.1, 1.3, 1.4).
If you use calibration correction,
check the set values.
Change the input to meet the specifications.
Is the input wiring correct?
• Attach the input terminal cover properly.
• Protect the input terminal from wind or fans.
• Keep the temperature fluctuation near
the input terminal to a minimum.
Is the range/span
setting appropriate?
Taking measures
against noise?
Is the environmental
temperature kept constant
(TC input)?
• Separate the input wiring from noise sources.
• Ground the recorder.
• Ground the object under measurement.
• Insulate the TC from the object under
measurement.
• Use shielded cables for input.
• Change the integral time of the input A/D
converter (Sec. 1.7).
• Use moving average on the input (Sec 1.2).
• Wire correctly (F.S.G.).
• Install the terminal block correctly.
• Fasten the terminal screws correctly.
• Insulate the RTD from the ground.
• If burnt, replace the TC.
Are there parallel connections
with other devices?
NO
NO
YES
YES
Is the RJC setting correct
(TC input)?
• Disable the burnout function on other devices.
• Ground the GX/GP and other equipment at
one point.
• Disconnect parallel wiring
(use a double-element TC, for instance).
Enter the correct setting.
Servicing is required. Contact your
nearest YOKOGAWA dealer.
Sec. 1.2
General Specifications
F.S.G.: First Step Guide
5.2 Troubleshooting