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1.2 PREVENTIVE MAINTENANCE OF MOTORS AND DETECTORS
1.2.1 Warnings, Cautions, and Notes on Preventive Maintenance of
Motors and Detectors
This subsection contains the safety precautions for motor and detector preventive maintenance, which are classified into
"warnings", "cautions", and "notes" according to their bearing on safety. Make sure that you understand and comply with these
precautions when carrying out the maintenance work.
• Make sure that you are safely dressed and have a safe working environment when performing preventive
maintenance for a motor.
- Be dressed safely, e.g. by wearing gloves and safety shoes, to protect against injury due to an edge or protrusion and
- Have the work done by more than one person, where possible, so that immediate action can be taken if an accident
occurs when handling a motor.
- A motor is heavy. When moving it, use a crane or other appropriate equipment to protect against injury. For
information about the weight of the motor, refer to its DESCRIPTIONS manual (shown earlier).
- Clothes or fingers can be caught in a rotating motor or come into contact with a moving part of it. Standing in the
direction of motor rotation (direction of motion) can pose a risk of injury. Before rotating a motor, check that there is
no object that is thrown away by motor rotation.
• Be careful about electric shock, fire, and other accidents.
- Do not handle a motor with a wet hand.
- To prevent electric shock, make sure that no conductive object, such as a terminal, is exposed when the motor is
- Before touching a motor or any surrounding part, check that the power is shut off and take appropriate safety
- High voltage remains across power line terminals of a motor even after the power is shut off (for at least five minutes).
Do not touch a motor in such a condition or connect it to other equipment.
- A loose or disconnected terminal, short-circuited terminals, or a terminal connected to the ground can cause
overheating, spark, fire, or damage to the motor. Take appropriate precautions to prevent these accidents.
- When placed near any inflammable object or material, a motor can be ignited, catch fire, or explode. Avoid placing it
near such object or material.
Do not disassemble or modify a motor.
Motors such as linear motors, synchronous built-in servo motors, and synchronous built-in spindle motors contain very
strong magnets. If electronic medical apparatus comes near, these motors can cause the apparatus to malfunction, potentially
putting the user's life in danger. Also, disassembling or modifying a motor can cause a failure, regardless of the type of
motor. Do not disassemble or modify a motor in any way not specified by FANUC.
• Ensure that the specified cooling conditions are met.
If the specified cooling conditions are not met (the motor is insufficiently or excessively cooled), the motor can fail.
Problems that can cause a motor failure, such as liquid piping clog, leakage, and fan motor trouble, should be eliminated
through periodic inspection. Do not drive the motor when the cooling system is in an abnormal condition.
• Do not change the system configuration.
Do not change the configuration of the system when it is running normally. Doing so can cause an accident or failure. If
you disconnect a cable for maintenance or some other purpose, take an appropriate measure, such as putting a mark on it,
to ensure you can restore the original state.
• Use the tapped holes of a motor only to move the motor.