Hitachi SJ2002 Series Instruction Manual page 12

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CAUTION: Do not stop operation by switching OFF electromagnetic contactors on the
primary or secondary sides of the inverter.
Ground fault
Power
Input
When there has been a sudden power failure while an operation instruction is active, then
the unit may restart operation automatically after the power failure has ended. If there is
a possibility that such an occurrence may harm humans, then install an electromagnetic
contactor (Mgo) on the power supply side, so that the circuit does not allow automatic
restarting after the power supply recovers. If the optional remote operator is used and the
retry function has been selected, this will also cause automatic restarting when a Run
command is active. So, please be careful.
CAUTION: Do not insert leading power factor capacitors or surge absorbers between
the output terminals of the inverter and motor.
Ground fault
Power
Input
CAUTION: MOTOR TERMINAL SURGE VOLTAGE SUPPRESSION FILTER
(For the 400 V CLASS)
In a system using an inverter with the voltage control PWM system, a voltage surge
caused by the cable constants such as the cable length (especially when the distance
between the motor and inverter is 10 m or more) and cabling method may occur at the
motor terminals. A dedicated filter of the 400 V class for suppressing this voltage surge
is available. Be sure to install a filter in this situation.
interrupter
L1, L2, L3
interrupter
L1, L2, L3
U, V, W
Inverter
PCS
FW
Surge absorber
U, V, W
Inverter
GND lug
Motor
Motor
Leading power
factor capacitor