5 installing transient protection, Junction box ground wire connections, Connecting electronic equipment 25 – Rice Lake SURVIVOR OTR Steel Deck User Manual
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Connecting Electronic Equipment
25
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 J-box board(s). This DC transient protection handles up to
eight load cells. Scales with more than eight load cells require additional J-boxes.
•
Self-contained DC transient protection unit in the homerun cable at the indicator.
•
115 VAC uninterruptable 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. Grounding and Transient Protection on OTR Scale
Serial communications (if used) 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.
21306 REV. B
-SI
+SI
+SE
JU5
JU6
JU7
JU8
JU9
JU10
JU11
JU12
TRIM 8
TRIM 7
TRIM 6
TRIM 5
TRIM 4
TRIM 3
TRIM 2
-SE
SHD
+EX
-EX
CELL 2
CELL 8
CELL 7
CELL 6
CELL 5
CELL 4
CELL 3
CELL 1
INDICATO
R
TRIM 1
PT8
PT7
PT6
PT5
PT4
PT3
PT2
PT1
RNET2
RNET1
RNET3
RNET4
PT10
SECTION 3 TRI
M
3
2
1
ON
SECTION 2 TRIM
3
2
1
ON
PT10
PT9
SECTION 1 TRIM
3
2
1
ON
SECTION 4 TRIM
3
2
1
ON
PT12
+EXC
-EXC
+SIG
-SIG
SHD
+EXC
-EXC
+SIG
-SIG
SHD
+EXC
-EXC
+SIG
-SIG
SHD
+EXC
-EXC
+SIG
-SIG
SHD
+EXC
-EXC
+SIG
-SIG
SHD
+EXC
-EXC
+SIG
-SIG
SHD
+EXC
-EXC
+SIG
-SIG
SHD
+EXC
-EXC
+SIG
-SIG
SHD
Ground Wire
Junction Box Ground Wire Connections
Ground Lug
J-Box
Mounting
Stud
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 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.
Note
Note