Even if the inverter has interrupted power to the motor, if the voltage is applied to the main
circuit input terminals L1/R, L2/S and L3/T, voltage may be output to inverter output terminals
U, V and W.
This may result in a serious injury due to an electric shock.
Even if the motor is stopped due to DC braking or pre-excitation, voltage is output to inverter
output terminals U, V and W.
This may result in a serious injury due to an electric shock.
Starting auto-tuning involves motor rotation. Sufficiently check that motor rotation carries with
it no danger beforehand.
Not doing so may result in injury or accidents.
The inverter may operate with acceleration/deceleration time or speed different from as set
due to stall prevention function. Design the machine so that safety is ensured even in such
cases.
Not doing so may result in accidents.
The inverter can easily have high-speed operation set. When changing the speed setting,
carefully check the specifications of motors or machine beforehand.
Additionally, set the parameters only after fully understanding the User’s Manual. If the user
recklessly changes the parameters and then operates the inverter, the motor may rotate at a
torque or speed not permitted for the machine.
This may result in injury.
If you enable the “Restart mode after momentary power failure” (F014 = 3 or 4), then the in-
verter automatically restarts running the motor when the power is recovered. Design the ma-
chine so that safety is ensured even after such restarts.
Not doing so may result in injury or accidents.
The STOP key on the Operator may be disabled due to parameter setting, etc. Provide an
emergency stop switch separately.
Not doing so may result in accidents.
If the motor stops as a result of a trip, the inverter may automatically restart and drive the
motor depending on the parameter setting. Design the machine so that human safety and
the safety of surroundings is ensured at the time of restarting.
Not doing so may result in accidents.
Remove any cause of the protective functions operating, then check the RUN command is
OFF and cancel the alarm. Canceling the alarm when the RUN command is ON means that
the inverter will supply power to the motor, which may start rotation thus posing a danger.
This may result in accidents.
When switching start methods or speed by external input, the motor may start suddenly or
the speed may abruptly change.
This may result in injury or accidents.
Input terminals have functions such as run, stop and speed change. If the parameters are
changed while signals are input to the input terminals, the motor operation may suddenly
change. Ensure that you change parameters only after fully securing safety.
Not doing so may result in injury or accidents.
The branch circuit protection being open may indicate an interruption in the fault current.
In order to reduce the danger of fire and electric shock, inspect energized parts and other
controller components, and replace if damaged.
In the event of the overload relay current element burning out, the entire overload relay must
be replaced.
Not doing so may result in a serious injury due to an electric shock or fire.
Output terminals (ROA, ROB) use relays, and may remain ON, OFF or undetermined when
their lifetime is reached. For safety, equip the inverter with an external protective function.
Not doing so may result in fire or accidents.
Safety Precautions
19
M1 Series Standard Type User's Manual (I669)
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