Periodic Inspections - Nachi RMU20-20 Instruction Manual

7.1

Periodic Inspections

When inspecting the RMU or replacing its parts, proceed with the work while observing the cautions below.
To avoid electric shocks, allow 5 minutes to pass after turning off the primary power of the
controller before proceeding to replace any parts.
Even when the power of the controller is turned off, power may still be supplied from the
DANGER
process control panel. Check the power LEDs on the RMU and check that they are all off.
To avoid electric shocks, do not carry out the work with wet hands.
Electric shocks can result in serious injury or death.
The replacement work must be done only by individuals who have attended the robot
school (maintenance course) held by the manufacturer.
Electric shocks or unexpected movements of the robot which can pin an operator cause
WARNING
death or serious injury.
Carry out the work with the body (hands) of the maintenance technician and G terminal of
the controller electrically shorted to set them to the same potential.
(ex. Using an earthing band )
WARNING
Electric shocks can result in serious injury or death.
A large number of connectors are connected to the RMU. When replacing parts, proceed
carefully to ensure that the connectors are not connected incorrectly and that none of the
connectors are left unconnected.
WARNING Electric shocks and the catching fire of combustible parts can result in serious injury or
death.
Take care not to damage the wires when replacing parts.
Under no circumstances must any of the electronic components and patterns of the
circuit boards or contact areas of the connectors be touched when replacing the parts
WARNING
inside the robot and robot controller. Remember to hold the circuit boards by their edges.
If the components, patterns or contact areas are touched, the resulting electric shock can
result in serious injury or death.
The robot monitoring unit cannot be disassembled even for maintenance work. The
safety functions cannot be maintained if the unit is disassembled.
Use of a reassembled unit may result in death or serious injury.
CAUTION

7.1Periodic Inspections

7-1