Panasonic MINAS A6 Series, Technical Reference

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Advanced Safety Functions
8-20
8.9 Safety precautions

When using the safety functions, be sure to perform equipment risk assessment to ensure that the system
conforms to the safety requirements.
Using it in a state that does not satisfy the safety requirement function may result in personal injury.

Even while the safety functions are working, the following potential safety hazards exist. Be sure to check the
safety in risk assessment.
Incorrect use may cause an accident resulting in injury or death.
-
The motor may move when external force (e.g. gravity force on vertical axis) is exerted on it. Provide an
external brake, etc., as necessary to secure the motor. Note that the purpose of servo motor with brake is
holding and it cannot be used for braking application.
-
When parameter Pr5.10 "Sequence at alarm" is set to free run (disable dynamic brake), the motor is in free
run state and requires longer stop distance even if no external force is applied. Make sure that this does
not cause any problem.
(In safety state, even if an alarm does not occur, “Sequence at alarm” is applied.)
-
The motor may move at electrical angle of about 180 degrees due to a power transistor failure.Make sure
this is not a problem.
-
The safety state turns off the current to the motor but does not turn off power to the driver module and
power supply module nor isolate it electrically. When starting maintenance service of the driver module or
power supply module, turn off the power to these modules and check that the charge lamp of each module
is off.

Dynamic brake and external brake release signal outputs are not related to safety function. When designing
the system, make sure that the failure of external brake release during the safety state does not result in a
dangerous condition. Incorrect use may cause an accident resulting in injury or death.

When using the safety functions, connect equipment conforming to the safety standards. Use of equipment
that does not comply with safety standards may result in a serious accident.