Rice Lake SCT-30 - Manual (Page 7)

Introduction 3
Connecting Several Cells in Parallel:
Connect several load cells in parallel by using, if necessary, a watertight junction box
with a terminal box. The load cell connection extension cables must be shielded,
placed individually into their piping or conduit, and laid as far as possible from the
power cables (in case of 4-wire connections, use cables with 4 x 1 sq.mm minimum
cross-section).
Welding:
Avoid welding with the load cells already installed. If this cannot be avoided, place
the welder ground clamp close to the required welding point to prevent sending
current through the load cell body.
Windy Conditions - Shocks - Vibrations:
The use of weigh modules is strongly recommended for all load cells to compensate
for misalignment of the support surfaces. The system designer must ensure that the
scale is protected against lateral shifting and tipping relating to shocks and vibration,
windy conditions, seismic conditions and stability of the support structure.
Grounding The Weighed Structure:
By means of a 10 AWG solid or braided wire or braided grounding strap, connect the
load cell upper support plate with the lower support plate, then connect all the lower
plates to a single earth ground. Once installed, electrostatic charges are discharged to
the ground without going through or damaging the load cells. Failure to implement a
proper grounding system might not affect the operation of the weighing system; this,
however, does not rule out the possibility that the load cells and connected instrument
may become damaged by ESD. It is forbidden to ensure grounding system continuity
by using metal parts contained in the weighed structure(see Figure 1-1).
Figure 1-1. Installation Recommendations
Uses ground plate
to continue ground.
Uses structure to continue ground.