RabbitCore eDisplay OP7200, Руководство пользователя

Страница: 127 / 174

User’s Manual 121
6. I
NSTALLATION
, M
OUNTING
,
AND
C
ARE
G
UIDELINES
Chapter 6 describes some considerations for mounting the
OP7200 in a panel, and includes detailed mounting instructions,
protective grounding instructions, and care guidelines for clean-
ing the screen overlay.
6.1 Grounding
CAUTION: Many of the OP7200 ICs are sensitive to static. Use extra caution when han-
dling units in high-static areas.
To meet electromagnetic compatibility requirements, and in particular to prevent misoper-
ation or damage from electrostatic discharges, the bezel must be connected to a protective
ground via a low-impedance path.
A protective building ground is recommended once the OP7200 is installed at the location
where it will be used. In addition to providing protection against an unexpected electric
shock, the connection to building ground also mitigates any problems from external elec-
trostatic discharges and transients, and dampens any RF emissions.
The metal case is already connected electrically to the bezel, and so does not require a sep-
arate ground connection.
The recommended way to connect an OP7200 to a building ground is to mount the unit in a
metal panel that is already grounded. Use a wire with a size of at least 20AWG (0.5 mm
2
),
preferably stranded, to establish a connection between one of the screws holding the back
cover in place and the protective building ground. This wire should be as short as possible
to keep its impedance low.
There is an electrical connection between the OP7200 bezel/casing and the connections
marked GND or AGND on the OP7200 headers. This connection is the return for the I/O
signals, and should not be used for a protective ground connection.