Western Scale m2000D, Техническое руководство

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m
2000D technical manual
Page 11
S
YSTEM
G
ROUNDING
The following information deals with grounding as it relates to lightning and electrostatic
discharges to earth ground. The M2000D provides for surge protection, however in order
for surge conditions to be diverted properly, a good earth ground path should be in place.
Surge protection components by themselves will not absorb all electrostatic discharge – it
should simply divert charges safely to an earth ground path. Because the indicator is
galvanically isolated from the remote DLC slaves, both ends should be grounded to a good
earth connection.
Normally the DLC terminal box will be mounted onto the steel chassis of the weigh
platform with a braided earth strap to the steel structure of the weighing platform. The steel
frame should be connected to a metal rod planted in the earth close by the weighing
platform. Earth straps should be at least 8 AWG thick and preferably no longer than 2 feet.
The earth strap should be kept as straight as possible - kinks in the earth straps induce
inductive resistances to the discharge path to earth ground.
Œ
Earth Strap
•
Load Cell
Ž
Platform Chassis
•
Earth Strap
•
DLC Junction Box
‘
Weigh Platform
’
Earthing Rod
“
Earth Strap
Œ
•
Ž
•
‘
’
“
•
GENERAL
INSTALLATION