MITSUBISHI ELECTRIC MOTION CONTROLLERS Q172DCPU - Manual (Page 3)

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For Safe Operations
1. Prevention of electric shocks
DANGER
Never open the front case or terminal covers while the power is ON or the unit is running, as this
may lead to electric shocks.
Never run the unit with the front case or terminal cover removed. The high voltage terminal and
charged sections will be exposed and may lead to electric shocks.
Never open the front case or terminal cover at times other than wiring work or periodic
inspections even if the power is OFF. The insides of the Motion controller and servo amplifier are
charged and may lead to electric shocks.
Completely turn off the externally supplied power used in the system before mounting or removing the
module, performing wiring work, or inspections. Failing to do so may lead to electric shocks.
When performing wiring work or inspections, turn the power OFF, wait at least ten minutes, and
then check the voltage with a tester, etc.. Failing to do so may lead to electric shocks.
Be sure to ground the Motion controller, servo amplifier and servomotor. (Ground resistance :
100 or less) Do not ground commonly with other devices.
The wiring work and inspections must be done by a qualified technician.
Wire the units after installing the Motion controller, servo amplifier and servomotor. Failing to do
so may lead to electric shocks or damage.
Never operate the switches with wet hands, as this may lead to electric shocks.
Do not damage, apply excessive stress, place heavy things on or sandwich the cables, as this
may lead to electric shocks.
Do not touch the Motion controller, servo amplifier or servomotor terminal blocks while the power
is ON, as this may lead to electric shocks.
Do not touch the built-in power supply, built-in grounding or signal wires of the Motion controller
and servo amplifier, as this may lead to electric shocks.
2. For fire prevention
CAUTION
Install the Motion controller, servo amplifier, servomotor and regenerative resistor on
incombustible. Installing them directly or close to combustibles will lead to fire.
If a fault occurs in the Motion controller or servo amplifier, shut the power OFF at the servo
amplifier’s power source. If a large current continues to flow, fire may occur.
When using a regenerative resistor, shut the power OFF with an error signal. The regenerative
resistor may abnormally overheat due to a fault in the regenerative transistor, etc., and may lead
to fire.
Always take heat measures such as flame proofing for the inside of the control panel where the
servo amplifier or regenerative resistor is installed and for the wires used. Failing to do so may
lead to fire.
Do not damage, apply excessive stress, place heavy things on or sandwich the cables, as this may
lead to fire.