20 A255 Robot Arm User Guide
99-04-23
• Awareness barriers
An awareness barrier, such as a length of yellow chain, alerts personnel to their
nearness to the workspace, but is not sufficient to prohibit access into the
workspace.
• Passive warnings
Passive warnings include markings on the floor or table top.
• Beacon light
A prominent light which is lit when the robot system has power on.
• Training
Ensure that personnel who program, operate, maintain, or repair the robot are
adequately trained and demonstrate competence to perform their jobs safely.
Safety Regulations
In addition, your installation should comply with any applicable safety regulations
or standards of your national or local jurisdiction.
Note: Care should be taken to ensure that the activation of an interlock installed
to prevent against one hazard does not create a new hazard.
Power
Power Supply
Power supplied to the robot controller must be stable. If your power supply is
unstable (has fluctuations in frequency or surges), install a regulating system in
the power supply.
• Do not exceed voltage fluctuations ±10% of the nominal voltage.
• For variations in voltage only, install a regulating transformer. A more complete
regulating system, such as an Uninterruptible Power Supply (UPS), can be
used for all robot systems.
• Do not exceed the power rating or fuse rating for the robot controller.
Note: Before entering within the robot’s safeguarded area, perform the checks
and safety precautions as listed on pages 23 and 24.
Power Failure
If a power failure occurs, the robot controller automatically removes arm power.
This prevents the arm from moving when power is restored.
• You must restart the robot controller after a power failure.
Ground
Ensure that the AC power supply is properly grounded. The incoming AC plug has
three wires: hot, neutral, and chassis ground. All three wires must be used. Hot
and neutral supply power to the system and the ground shields the controller from
external noise and voltage potentials.
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