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Maintenance of the NT31/NT31C Section 7-3
7-3 Maintenance of the NT31/NT31C
Carry out maintenance work in order to ensure that the NT31/NT31C is
always used in its optimum condition.
Spare PT It is advisable to have a spare NT31/NT31C available to minimize system
downtime in the event of an NT31/NT31C failure or if the screen display
becomes difficult to read due to deterioration of the display unit.
Backlight When the backlight in the display is getting dim and the screen cannot be read
easily, replace the backlight. The backlight can be replaced at the rear of the
NT31-ST121@-EV2/NT31C-ST141@-EV2 while it is mounted in an operation
panel. The backlight for the NT31-ST122@-EV2, NT31-ST123@-EV3, NT31C-
ST142@-EV2, and NT31C-ST143@-EV3 cannot be replaced by the user.
Contact your OMRON service center when the backlight needs to be
replaced.
Replaceable Backlight Model
NT31C-CFL01 (for both NT31-ST121@-EV2/NT31C-ST141@-EV2)
Guide to Backlight Replacement
Under normal conditions it can be assumed that the backlight will need to be
replaced after about 25,000 hours when used at medium brightness (the fig-
ure is about 10,000 hours when used at the high brightness setting). However,
the life of the backlight does vary, particularly in accordance with the tempera-
ture in the environment in which it is used, and it should be replaced when it is
getting dim and the screen is getting hard to read. The life expectancy of the
backlight for the NT31-ST122@-EV2, NT31-ST122@-EV3, /NT31C-ST142@-
EV2, and NT31C-ST142@-EV3 at high brightness is 50,000 hours. The back-
light cannot be replaced by the user, however. Contact your OMRON service
center when the backlight needs to be replaced.
Notes on Replacing the
Backlight
Pay attention to the following points when replacing the backlight.
• Carry out the replacement work in a location where there is no danger
that dust or foreign bodies will enter the PT, and where no water will drip
onto it.
Do not touch the printed circuit boards of the NT31-ST121@-EV2/
NT31C-ST141@-EV2 with your bare hands.
Data Over Flow Error Communications command from the
host is too long. (With memory link)
Set flow control method in the host.
Increase transmission interval.
Command transmission to the host is
not possible.
Check the communications cable.
Check the control method at the PT and the host.
Increase the communications on speed when it to
slow.
Error Details Displayed Probable Cause Remedy
WARNING
Do not attempt to take the unit apart and do not touch
any internal parts while the power is being supplied.
Doing either of these may result in electrical shock.
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