HEIDENHAIN TNC 620 User Manual page 473

Operating the touchscreen | Display unit and operation
Operation and cleaning
Avoiding electrostatic discharge when operating
touchscreens
Touchscreens are based on a capacitive working
principle, i.e. they are sensitive to electrostatic charges
generated by the operators.
Users can discharge static electricity from their body by
touching grounded metal objects. This problem can be
avoided by wearing ESD clothing.
Capacitative sensors detect a contact as soon as a person's finger
touches the touchscreen. Touchscreens can even be operated with
dirty hands, as long as the touch sensors are able to detect the skin
resistance. While small amounts of liquid will not cause a fault,
larger quantities of liquid will cause erroneous input.
Use work gloves to prevent the device from becoming
dirty. The rubber material of special touchscreen
work gloves contains metal ions that transfer the skin
resistance to the display.
In order to maintain the functionality of the touchscreen, use the
following cleaners only:
Glass cleaner
Foaming screen cleaners
Mild detergents
Do not apply the cleaner directly to screen, but slightly
dampen a suitable cleaning cloth with it.
Switch off the control before cleaning the touchscreen. As an
alternative, you can use the touchscreen cleaning mode.
Further information: "Touchscreen Cleaning", Page 487
Never use the following cleaners or cleaning aids, in order
to avoid damage to the touchscreen:
Aggressive solvents
Abrasives
Compressed air
Steam cleaners
HEIDENHAIN | TNC 620 | User's Manual for Setup, Testing and Running NC Programs | 01/2022
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