YASKAWA ArcWorld 50, System Manual

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3-12
183574-1CD
183574-1CD
3 Installation
3.5 Cable Connections
ArcWorld 50/50S/52/52S
3.5 Cable Connections
After components are level and securely in place, the cables should be
unwrapped from around the equipment and installed according to the
cable diagram included in the system drawing package. Each cable
connection is clearly identified for ease of installation.
3.5.1 Connection to Earth Ground
The Robot and Controller must be connected to a low-resistance earth
ground. If a ground stake is used, it should be driven at least 2.43 m into
the soil. The soil surrounding the ground stake should be treated with a
chemical that increases the soil conductivity in the vicinity of the stake.
This is often referred to as a “low-resistance earth ground” and may
require more than a single driven ground rod, depending on soil
conditions. Multiple ground rods (bonded together) or even a bonded
network of buried copper sheeting (plus conduction-enhancing chemicals)
may be required, depending on local soil conditions. In any event, the
“low-resistance earth ground” must indicate a resistance of
100 ohms or less (when measured directly between grounded equipment
and the earth ground system). Be advised that specialized measuring
equipment is usually required to get an accurate “resistance-to-ground”
reading. Consult a specialist in this field, if required.
Connect the Robots and Controller assembly to the earth ground as
follows:
1. Connect one end of an earth ground wire to the lug marked EARTH
GROUND on the connector panel of Robot R1. Connect the other end
of the earth ground wire to the low-resistance earth ground.
See Fig. 1 - 1 "Robot Cell Assembly" on page 1-5 for the location of
Robot.
WARNING
Do not use the ArcWorld unless specified components are connected
to a low-resistance earth ground. Do not connect the earth ground wire
with the wires for the electric power source, welder, etc. The low-
resistance earth ground must be a “dedicated” ground that is a direct
connection between a component and the earth ground point.
Operator injury or death, as well as equipment damage, may result
from an inadequate or defective earth ground system.
NOTICE
The customer shall supply all wires associated with the earth ground.
The customer is responsible for establishing the correct gauge of all
wires associated with the earth ground and maintaining an adequate
earth ground (measured resistance of 100 ohms or less).
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