Rice Lake SURVIVOR OTR Series, Руководство по установке

Страница: 27 / 36

Connecting Electronic Equipment
© Rice Lake Weighing Systems ● All Rights Reserved 23
Figure 7-3. Single-Point Grounding Diagram
Always verify that installed wiring is properly grounded.
7.5 Installing Transient Protection
A lightning protection package comes standard on all truck scales. The individual components of this comprehensive package
are designed to protect AC and DC portions of the system. The lightning protection package includes:
• DC transient protection included with standard junction box board(s); this DC transient protection handles up to eight
load cells; scales with more than eight load cells require additional junction boxes
• Self-contained DC transient protection unit in the homerun cable at the indicator
• 115 VAC uninterrupted power supply/surge protector in the AC line before the indicator
• Number 10 bare ground conductor cable buried in earth from scale frame to DC transient board at indicator and finally to
the AC power ground lug
Figure 7-4. Inter-Module Ground Strap
Scale frame must be connected with 10 gauge wire to the ground lug of transient protection board inside the junction box.
Scales with more than one junction box require ground straps to be installed between modules.
In addition, all junction boxes need to be connected to the scale frame.
Final ground wire connection must be at AC power-supply ground terminal or ground rod.
Serial communications may also require transient protection to fully protect entire system. A TP-232 DC Transient
Protection is suitable protection for serial communications lines. In addition, printers, remote displays, and other
devices connected to serial communications should be protected with AC transient protection.
Note
Note
Note