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Lightning and Transient Protection Options
A lightning protection package is available as an option for all SR and EZ scales. The individual compo-
nents of this comprehensive package are designed to protect AC and DC portions of the system, as well as
any serial communication lines. The optional lightning protection package consists of the following:
•
DC transient protection board(s) mounted within the junction box. This DC transient protector
handles up to eight load cells and also protects serial communication lines. Scales with more than
eight load cells will require a DC transient protection board in each junction box.
•
Self-contained DC transient protection unit in homerun cable at indicator.
•
Single-point #10 bare ground conductor cable buried in earth from scale frame to DC transient
board in junction box to DC transient board at indicator, then to AC power ground lug.
•
120 VAC uninterruptible power supply/surge protector in AC line before indicator.
All elements of the optional package must be installed in order to apply for the Lightning Protection
Extended Warranty Coverage detailed on the following page.
Grounding and Transient Protection on Typical SR Scale
NOTES:
The scale frame must be connected with 10
ga. wire to the ground lug of the transient
protection board inside the junction box.
Scales with more than one junction
box require a transient protection board in
each box. Ground lugs on each board must
be interconnected with 10 ga. wire.
Fiinal ground wire connection must be at AC
power supply ground terminal or ground rod.
DC protection board
10 ga. Bare Wire
To Scale Frame
10
Junction Box with DC Transient
Protection Board Installed
TO INDICATOR
Ground Lug
10 ga. Bare Ground Wire
To DC Protection Ground
Connection before Indicator
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