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6
EXCELL PRECISI
ON CO., LTD
2.3 Grounding
Properly grounding can only elaborate the performance of a surge protector. To select the
welding point by referring to the local voltage, all the welding points will share the
common-mode voltage to the ground. The welding point is connected to the local ground
network or ground rod system; hence, no extra ground network or ground rod system is
needed to be installed.
Proper grounding is the local structure of the device (Figure 1 and Figure 2), no matter
connected to the steel connection of metal or reinforced concrete weighbridge. From the
grounding bolt M8 external connect to the ground wire of the grounding point (10mm
2
mm
copper or equivalent metal wire or ribbon). The combination that less than 3m develops for
optimum performance. Use proper amount of preservatives to protect the exposed metal.
In loadometer (weighbridge) or control room, SP151 surge protector should be located
close to the weighing computer or dashboard display, and the ground wire should be
connected to independent grounding rods of the AC power. Ground wires that more than
3m long, a ground between the SP151 with the instrument is needed (See Figure 4).
Figure 3
Earthing/grounding
stud M8
※ Tighten the stud M8 upward
Grounding Wire
M8