Digi-Star TCX-1000 SERIES - Manual (Page 2)

D3556 05/29/03 REV. 2.2 Copyright 2001
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READ THIS FIRST
TYREL PRODUCT NOTICE – GROUNDING 6/2/96
Proper grounding is critical to ensure correct
operation of your new TCX-1300 Scale Indicator.
After mounting the indicator, directly connect the power cable of the
indicator to the vehicle battery or regulated power supply.
The stand of the TCX-1300 should be connected to the vehicle frame
using a lugged 16AWG or heavier stranded wire. This lug can be connected to
one of the bolts, which secures the indicator stand to the truck if the installation allows.
Alternatively this lug can be connected to one of the two #6 screws at the bottom of the
stand back-plate on the backside.
NOTE: In many newer vehicles the body and cab are isolated
from the frame, making these unsuitable for ground connections.
The chassis ground from the indicator must be connected to the
frame of the vehicle to ensure proper grounding.
When using a junction box, the negative load cell excitation must
not be connected to ground In the TCX-1300 negative excitation is not the same as
frame ground… so if negative excitation shorts to frame ground, it will cause a short and
the TCX-1300 will be damaged. Likely it will have a failure to show a weight. The
Negative Excitation Wire is connected to position 4 of the TCX-1300’s Load-Cell
Connector. Be sure the negative excitation lead and ground are separate.
NOTE: In the TCX-1300 the negative excitation is carried on the black wire. Digi-
Star J-box cables (and possibly other brands) have the black wire connected to the
shield wire. With this type of J-box cable, the installer must make sure that the
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