Control Panel - Mitsubishi GT16 User Manual

5.1.2

Control panel

The GOT is an open type device (device installed to another device) and must be installed in a conductive control panel.
It not only assure the safety but also has a large effect to shut down the noise generated from GOT, on the control panel.
(1) Control panel
(a) The control panel must be conductive.
(b) When fixing a top or bottom plate of the control panel with bolts, do not coat the plate and bolt surfaces so
that they will come into contact.
And connect the door and box using a thick grounding cable in order to ensure the low impedance under
high frequency.
(c) When using an inner plate to ensure electric conductivity with the control panel, do not coat the fixing bolt
area of the inner plate and control panel to ensure conductivity in the largest area as possible.
(d) Ground the control panel using a thick grounding cable in order to ensure the low impedance under high
frequency.
(e) The diameter of cable holes in the control panel must be 10cm (3.94in.). In order to reduce the chance of
radio waves leaking out, ensure that the space between the control panel and its door is small as possible.
Paste the following EMI gasket directly on the painted surface to seal the space so that the leak of electric
wave can be suppressed.
KITAGAWA INDUSTRIES CO., LTD.
Our test has been carried out on a panel having the damping characteristics of 37dB max. and 30dB mean
(measured by 3m method with 30 to 300MHz).
(2) Connection of power and ground wires
Ground and power supply wires for the GOT must be connected as described below.
(a) Provide a grounding point near the GOT. Short-circuit the LG and FG terminals of the GOT (LG: line
ground, FG: frame ground) and ground them with the thickest and shortest wire possible (The wire length
must be 30cm (11.81in.) or shorter.)
The LG and FG terminals function is to pass the noise generated in the PC system to the ground, so an
impedance that is as low as possible must be ensured. As the wires are used to relieve the noise, the wire
itself carries a large noise content and thus short wiring means that the wire is prevented from acting as an
antenna.
Note) A long conductor will become a more efficient antenna at high frequency.
(b) The earth wire led from the earthing point must be twisted with the power supply wires.
By twisting with the earthing wire, noise flowing from the power supply wires can be relieved to the
earthing. However, if a filter is installed on the power supply wires, the wires and the earthing wire may not
need to be twisted.
5 - 3 5.1 Requirements to Meet EMC Directive
Manufacturer Series model name
UC series (Recommended Product)