Hitachi WJ Series User Manual page 94

Chapter 6
Operation
Work
No.
stage
14 Installation Wiring
Use Wiring
15
Maintenance Inspection
Installation
16 Setting
Use
17 Use Operation
18 General General
19 General General
* 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.
Target Residual
Details of hazard
section risk
Due to unstable output
caused by imbalance of
power supply voltage,
undervoltage, extreme
(D) DANGER
voltage drop or aging of
motor, the motor burns,
and eventually the inverter
fails.
The short circuit failure
caused by degradation of
motor insulation, cracking
of aged wires, etc., causes
phase loss on inverter
(D) DANGER
output, motor cable, and
motor. Driving the inverter
in such a condition burns
the motor, and eventually
the inverter fails.
By performing
inappropriate parameter
settings, high current flows
(D) DANGER
in the motor, causing it to
burn.
The stopped motor
automatically starts
(D) DANGER
running.
Damage and injury caused
General DANGER
by hidden risks.
Damage and injury caused
by failure to obtain
General DANGER
additional information
concerning risks.
6-2-2
Operation Check/Residual Risk
Protection measures
Check the receiving voltage of
inverter, power receiving method,
and power supply capacity are
appropriate.
Check there is no phase loss by
inspection.
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]).
To restart the motor after
stopping it by a function, define it
in the system.
Conduct risk assessment on the
system, and check that the fail-
safe function is incorporated into
the system.
Obtain the latest version of User's
Guide so that necessary
information can be checked.
Communicate information to the
end user as necessary.
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