Mitsubishi Electric A173UHCPU Programming Manual page 4

3. For injury prevention
Do not apply a voltage other than that specified in user's manual, or the instruction manual for the
product you are using on any terminal. Doing so may lead to destruction or damage.
Do not mistake the terminal connections, as this may lead to destruction or damage.
Do not mistake the polarity (+/−), as this may lead to destruction or damage.
The servo amplifier's heat radiating fins, regenerative resistor and servo amplifier, etc., will
be hot while the power is ON and for a short time after the power is turned OFF. Do not
touch these parts as doing so may lead to burns.
Always turn the power OFF before touching the servomotor shaft or coupled machines, as
these parts may lead to injuries.
Do not go near the machine during test operations or during operations such as teaching.
Doing so may lead to injuries.
4. Various precautions
Strictly observe the following precautions.
Mistaken handling of the unit may lead to faults, injuries or electric shocks.
(1) System structure
Always install a leakage breaker on the control unit and servo amplifier power source.
If installation of a magnetic contactor for power shut off during an error, etc., is specified in
the instruction manual for the servo amplifier, etc., always install the magnetic contactor.
Install an external emergency stop circuit so that the operation can be stopped immediately
and the power shut off.
Use the control unit, servo amplifier, servomotor and regenerative resistor with the combi-
nations listed in the instruction manual. Other combinations may lead to fires or faults.
If safety standards (ex., robot safety rules, etc.,) apply to the system using the control unit,
servo amplifier and servomotor, make sure that the safety standards are satisfied.
If the operation during a control unit or servo amplifier error and the safety direction
operation of the control unit differ, construct a countermeasure circuit externally of the
control unit and servo amplifier.
In systems where coasting of the servomotor will be a problem during emergency stop,
servo OFF or when the power is shut OFF, use dynamic brakes.
Make sure that the system considers the coasting amount even when using dynamic
brakes.
In systems where perpendicular shaft dropping may be a problem during emergency stop,
servo OFF or when the power is shut OFF, use both dynamic brakes and magnetic brakes.
The dynamic brakes must be used only during emergency stop and errors where servo OFF
occurs. These brakes must not be used for normal braking.
The brakes (magnetic brakes) assembled into the servomotor are for holding applications,
and must not be used for normal braking.
Construct the system so that there is a mechanical allowance allowing stopping even if the
stroke end limit switch is passed through at the max. speed.
CAUTION
CAUTION
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