Chapter 6 Operation Check/Residual Risk
6-2-2
Due to unstable output
caused by imbalance of
power supply voltage,
undervoltage, extreme
voltage drop or aging of
motor, the motor burns,
and eventually the inverter
fails.
Check the receiving voltage of
inverter, power receiving method,
and power supply capacity are
appropriate.
The short circuit failure
caused by degradation of
motor insulation, cracking
of aged wires, etc., causes
phase loss on inverter
output, motor cable, and
motor. Driving the inverter
in such a condition burns
the motor, and eventually
the inverter fails.
Check there is no phase loss by
inspection.
By performing
inappropriate parameter
settings, high current flows
in the motor, causing it to
burn.
Set appropriate values for
parameters related to output to
the motor, such as parameters
described in "Chapter 8
Mandatory Setting for Motor
Drive and Test Run" (load rating,
base frequency, motor rated
voltage, motor constant, and
electronic thermal), control
method, torque boost ([A041]
to[A047]
*1
), and DC output
setting ([A051] to [A058]).
The stopped motor
automatically starts
running.
To restart the motor after
stopping it by a function, define it
in the system.
Damage and injury caused
by hidden risks.
Conduct risk assessment on the
system, and check that the fail-
safe function is incorporated into
the system.
Damage and injury caused
by failure to obtain
additional information
concerning risks.
Obtain the latest version of User's
Guide so that necessary
information can be checked.
Communicate information to the
end user as necessary.
* Installation, wiring and setting work need to be performed by specialized technicians.
*1. "2nd-motor control [SET]" target parameter. Replace with the 2nd-control parameter if necessary.
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