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35
DL451 Modular I/O
Operator Manual
Appendix E: Service Information
This appendix provides instructions on routine servicing and cleaning, and gives details
on equipment disposal.
Routine maintenance
To help keep your DL351 Modular I/O unit in good working order and to make sure it
gives you optimum performance, we recommend that you carry out the following:
Monthly
Clean the unit, as detailed in “Cleaning the unit” on page 35.
Check pushbuttons for freedom of operation.
Check functionality of all pushbuttons, LEDs and the LCD display. You can quickly
carry out a visual check by switching the unit off and then on again, as they are all
activated during power-up.
Check functionality of equipment.
Yearly
Clean the internal fans, see “Cleaning the internal fans” on page 36.
Cleaning
Switch off the unit and electrically isolate it from the mains before cleaning;
see “To switch the unit off” on page 10.
Cleaning the unit
Clean the unit using a dry, lint-free cloth. Do not use harsh abrasives or solvents.
When cleaning the unit, take great care not to damage the pushbuttons.
Cleaning the LCD display
Carefully wipe the surface of the LCD display with a soft, lint-free cloth using ethanolic
liquid, such as a screen cleaner for LCDs, or by using a screen wipe specially designed
for the purpose. When cleaning the LCD display, please take the following precautions:
Avoid putting pressure on the screen.
Don’t use harsh abrasives, for example, paper towels.
Don’t apply liquids directly to the screen.
Don’t use ammonia-based cleaners and solvents, such as acetone.
If you have any queries about cleaning the LCD display, please don’t hesitate to contact
us.
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