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5.1 Requirements to Meet EMC Directive

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.

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.

Attach some EMI gaskets to fill up the space and suppress the leakage of radio waves.

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.

Manufacturer Series model name

KITAGAWA INDUSTRIES CO., LTD. UC series (Recommended Product)

Mitsubishi GOT1000 GT15 User Manual

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