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2. DESIGN
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3
CAUTION
Provide appropriate circuits external to the servo system CPU to prevent cases where danger
may result from abnormal operation of the overall system in the event of a power supply fault or
servo system CPU failure.
Mount each controller, servo amplifier, servomotor, and regenerative resistor on a non-
flammable material. Fire may result if they are mounted on or near a flammable material.
Take measures to cut off the servo amplifier power supply if the controller or servo amplifier fails.
Large currents continuing to flow can cause fires.
If a regenerative resistor is used, ensure that an alarm signal cuts off the power supply,
otherwise damage to the regenerative transistor, overheating of the regenerative resistor, or
even fire may result.
To prevent fires, take flameproofing measures inside the control box where the servo amplifier
and regenerative resistor are located and use non-flammable wiring.
Do not apply a voltage to terminals which exceeds the voltage prescribed in this manual or the
instruction manuals for other products used. Incorrect voltage can cause destruction of, or
damage to, the equipment.
Correct the terminals correctly. Incorrect connection can cause destruction of, or damage to, the
equipment.
Ensure polarity is correct. Incorrect polarity can cause destruction of, or damage to, the
equipment.
The servo amplifier cooling fins, regenerative resistor, and servomotors become hot during
operation and can remain hot for some time after the power is turned off. Do not touch these
parts or burn injuries may result.
To avoid injury, turn off the power before touching servomotor shafts or machinery connected to
them.
To avoid injury, do not approach machinery during trial or teaching operation.
Connect a leak breaker to the controller and servo amplifier power supply.
Provide an electromagnetic contactor for servo amplifiers and other equipment for which the
instruction manual prescribes an electromagnetic contactor to cut off the power in the event of an
error.
Provide an external emergency stop circuit to instantaneously stop operation and cut off power.
Use controllers, servo amplifiers, servomotors, and regenerative resistors in combinations
prescribed in this manual and the instruction manuals for other products used. Incorrect
combinations can cause damage to the system or fire.
If used in systems for which safety standards apply (such as robot systems), all controllers, servo
amplifiers, and servomotors must meet the prescribed safety standards.
Configure safety circuits external to the controller or servo amplifiers if their abnormal operation
could cause axis motion in a direction other than the safe operating direction for the system.
Use dynamic braking on servomotors if free running after an emergency stop, servo OFF, or a
power cut is a problem.
Consider the overrun distances of the system, even if dynamic braking is used.
Use both dynamic braking and electromagnetic braking on servomotors if vertical falling of axes
after an emergency stop, servo OFF, or a power cut is a problem.
Use the dynamic brake module to stop servomotors when an emergency error or other error
occurs to turn off the servomotors. Do not use it to stop the servomotors during normal operation.
The electromagnetic brake incorporated in a servomotor is intended for holding only. Do not use
it during normal operation.
Design systems with sufficient mechanical allowance for a safe stop if an axis passes the stroke-
end limit switch at maximum speed.
Select cables for the system with appropriate diameter, heat resistance, and bending resistance.
Use wires and cables with lengths in the range prescribed in this manual and the instruction
manuals for other products used.
Ensure that the characteristics of other components used in a system match those of the
controllers, servo amplifiers, and servomotors.
Attach covers to prevent servomotor rotating parts being touched during operation.
The electromagnetic brake may not be able to hold an axis due to age or machine construction
(if a servomotor is linked via a timing belt to a ball screw, for example). As a safety measure,
provide a stopping device on the machine.