Hitachi SJ Series User Manual page 95

Chapter 8
Operation
No. Work
stage
12 Electrical
Installation
(a) connections
12 Electrical
Installation
(b) connections
12 Electrical
Installation
(c) connections
12 Use Wiring
(d) Maintenance Inspection
12 Installation
Setting
(e) Use
13 Use Operation
14 General General
15 General General
* Installation, wiring, and setting work need to be
performed by specialized technicians.
Target Residual
Details of harm
section risk
Due to long wiring length,
insulation degraded by
(D) DANGER
surge, which eventually
burns the motor.
Since a motor with different
voltage class is connected
(D) DANGER to the inverter, insulation
degraded by surge, which
eventually burns the motor.
Due to unstable output
caused by imbalance of
power supply voltage,
(D) DANGER undervoltage, extreme
voltage drop, 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
(D) DANGER
current flows in the motor,
causing it to burn.
The stopped motor
(D) DANGER
automatically starts running.
Damage and injury caused
- DANGER
by hidden risks.
Damage and injury caused
by failure to obtain
- DANGER
additional information
concerning risks.
8-4
Operation Check/Residual Risks
Protective measure
If the wiring length exceeds 20m,
shorten the motor wiring length.
Install the optional LCR filter and
ACL.
Match the voltage class of inverter
and that of motor.
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 motor
electronic thermal function [bC-01]
to [bC125].
Set appropriate values for the
settings of base frequency, rated
motor voltage, motor constant, duty
rating, and DC output of control
mode and motor.
(representative parameters)
Motor-related parameters:
IM: [Hb102]~[Hb118]
SM (PMM): [Hd102]~[Hd118]
Control mode: [AA121]
Duty rating: [Ub-03]
DC braking: [AF101] - [AF109]
To restart the motor after stopping
it by a function, define it in the
system.
Perform 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 users as necessary.
* When using the [SET] terminal function of input
terminals, also check the second settings.
√