10
3.1.2 Installation instructions for EMC Directive
The programmable controller is open equipment and must be installed
within a control cabinet for use.* This not only ensures safety but also
ensues effective shielding of programmable controller-generated
electromagnetic noise.
(1) Control cabinet
(a) Use a conductive control cabinet.
(b) When attaching the control cabinet's top plate or base plate,
mask painting and weld so that good surface contact can be
made between the cabinet and plate.
(c) To ensure good electrical contact with the control cabinet, mask
the paint on the installation bolts of the inner plate in the control
cabinet so that contact between surfaces can be ensured over
the widest possible area.
(d) Earth the control cabinet with a thick wire so that a low
impedance connection to ground can be ensured even at high
frequencies.
(e) Holes made in the control cabinet must be 10 cm (3.94 in.)
diameter or less. If the holes are 10 cm (3.94 in.) or larger,
radio frequency noise may be emitted.
(f) Lock the control panel so that only those who are trained and
have acquiredenough knowledge of electric facilities can open
the control panel.
* Also, each network remote station needs to be installed inside the
control panel.
However, the waterproof type remote station can be installed
outside the control panel.
To Next Page
Loading...
