Hyundai HI4 - Manual (Page 25)

1. Safety, Operation Panel, Teach Pendant (1) Safety
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- Connect Grounding line into the grounding bus-bar inside the controller.
- In case of direct grounding of the robot by anchoring at floor, two point
grounding both by robot manipulator and by controller can produce closed circuit
and further cause abnormal operation of the robot on the contrary. In this
case, connect the grounding line to the base of robot manipulator and disconnect
to the controller. When robot trembles during stopping operation, check and
examine the grounding status immediately since the possible main causes are
incomplete grounding or closed circuit.
- In using built-in transformer gun, primary power cable can be easily worn out
by directly contacting with the gun. In this case, connect the grounding line
to the base of robot directly and disconnect to controller in order to protect
controller and preventing from any electric shock.