ICP DAS USA LP-22 Series User Manual page 19

Step 3: Connect the ground lead to the frame ground point.
Tips & Warnings
A good common ground reference (earth ground) is essential for proper
operation of the LP-9x2x. One side of all control circuits, power circuits, and the
ground lead must be properly connected to earth ground by either installing a
ground rod in close proximity to the enclosure or by connecting to the incoming
power system ground. There must be a single-point ground (i.e. copper bus bar)
for all devices in the enclosure that require an earth ground.
AM335X-PAC Series User Manual
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