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General Precautions - Read These First!
WARNING: This equipment should be installed, adjusted, and serviced by qualified electrical
maintenance personnel familiar with the construction and operation of the equipment and the
hazards involved. Failure to observe this precaution could result in bodily injury.
WARNING: The user is responsible for ensuring that all driven machinery, drive train mecha-
nism not supplied by Hitachi Industrial Equipment Systems Co., Ltd., and process line material
are capable of safe operation at an applied frequency of 150% of the maximum selected
frequency range to the AC motor. Failure to do so can result in destruction of equipment and
injury to personnel should a single-point failure occur.
WARNING: For equipment protection, install a ground leakage type breaker with a fast
response circuit capable of handling large currents. The ground fault protection circuit is not
designed to protect against personal injury.
HIGH VOLTAGE: HAZARD OF ELECTRICAL SHOCK. DISCONNECT INCOMING
POWER BEFORE WORKING ON THIS CONTROL.
WARNING: Wait at least five (5) minutes after turning OFF the input power supply before
performing maintenance or an inspection. Otherwise, there is the danger of electric shock.
CAUTION: These instructions should be read and clearly understood before working on
SJ300 series equipment.
CAUTION: Proper grounds, disconnecting devices and other safety devices and their location
are the responsibility of the user and are not provided by Hitachi Industrial Equipment Systems
Co., Ltd.
CAUTION: Be sure to connect a motor thermal disconnect switch or overload device to the
SJ300 series controller to assure that the inverter will shut down in the event of an overload or
an overheated motor.
HIGH VOLTAGE: Dangerous voltage exists until power light is OFF. Wait at least 5 minutes
after input power is disconnected before performing maintenance.
CAUTION: This equipment has high leakage current and must be permanently (fixed) hard-
wired to earth ground via two independent cables.
WARNING: Rotating shafts and above-ground electrical potentials can be hazardous. There-
fore, it is strongly recommended that all electrical work conform to the National Electrical
Codes and local regulations. Installation, alignment and maintenance should be performed only
by qualified personnel.
Factory-recommended test procedures included in the instruction manual should be followed.
Always disconnect electrical power before working on the unit.