Hitachi SJ Series, User Manual

Page: 95 / 786

8-4
Chapter 8 Operation Check/Residual Risks
* Installation, wiring, and setting work need to be
performed by specialized technicians.
* When using the [SET] terminal function of input
terminals, also check the second settings.
No.
Operation
stage
Work
Target
section
Residual
risk
Details of harm Protective measure
√
12
(a)
Installation
Electrical
connections
(D) DANGER
Due to long wiring length,
insulation degraded by
surge, which eventually
burns the motor. If the wiring length exceeds 20m,
shorten the motor wiring length.
Install the optional LCR filter and
ACL.
12
(b)
Installation
Electrical
connections
(D) DANGER
Since a motor with different
voltage class is connected
to the inverter, insulation
degraded by surge, which
eventually burns the motor.
Match the voltage class of inverter
and that of motor.
12
(c)
Installation
Electrical
connections
(D) DANGER
Due to unstable output
caused by imbalance of
power supply voltage,
undervoltage, extreme
voltage drop, 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.
12
(d)
Use
Maintenance
Wiring
Inspection
(D) DANGER
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.
12
(e)
Installation
Use
Setting (D) DANGER
By performing inappropriate
parameter settings, high
current flows in the motor,
causing it to burn.
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]
13 Use Operation (D) DANGER
The stopped motor
automatically starts running.
To restart the motor after stopping
it by a function, define it in the
system.
14 General General - DANGER
Damage and injury caused
by hidden risks.
Perform risk assessment on the
system, and check that the fail safe
function is incorporated into the
system.
15 General General - DANGER
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 users as necessary.