Mitsubishi Electric FR-E700 Instruction Manual page 10

CAUTION:
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● The electronic thermal relay function does not guarantee protection of the motor from
overheating. It is recommended to install both an external thermal and PTC thermistor for
overheat protection.
● Do not use a magnetic contactor on the inverter input for frequent starting/stopping of the
inverter. Otherwise, the life of the inverter decreases.
● Use a noise filter to reduce the effect of electromagnetic interference and follow the accepted
EMC procedures for proper installation of frequency inverters. Otherwise nearby electronic
equipment may be affected.
● Take appropriate measures regarding harmonics. Otherwise this can endanger compensa-
tion systems or overload generators.
● When driving a 400 V class motor by the inverter, the motor must be an insulation-enhanced
motor or measures must be taken to suppress surge voltage. Surge voltage attributable to
the wiring constants may occur at the motor terminals, deteriorating the insulation of the
motor.
● Use a motor designed for inverter operation. (The stress for motor windings is bigger than
in line power supply).
● When parameter clear or all clear is performed, set again the required parameters before
starting operations. Each parameter returns to the initial value.
● The inverter can be easily set for high-speed operation. Before changing its setting, fully
examine the performances of the motor and machine.
● The DC braking function of the frequency inverter is not designed to continuously hold a
load. Use an electro-mechanical holding brake on the motor for this purpose.
● Before running an inverter which had been stored for a long period, always perform inspec-
tion and test operation.
● For prevention of damage due to static electricity, touch nearby metal before touching this
product to eliminate static electricity from your body.
● The DC braking function of the frequency inverter is not designed to continuously hold a
load. Use an electro-mechanical holding brake on the motor for this purpose.
● If you are installing the inverter to drive a three-phase device while you are contracted for
lighting and power service, consult your electric power supplier.
● In order to protect the inverter and the system against unauthorized access by external
systems via network, take security measures including firewall settings.
● Depending on the network environment, the inverter may not operate as intended due to
delays or disconnection in communication. Carefully consider the conditions and safety for
the inverter on site.
Emergency Stop
CAUTION:
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● A safety backup such as an emergency brake must be provided for devices or equipment in
a system to prevent hazardous conditions in case of failure of the inverter or an external
device controlling the inverter.
● When the breaker on the inverter primary side trips, check for the wiring fault (short circuit),
damage to internal parts of the inverter, etc. Identify the cause of the trip, then remove the
cause and power on the breaker.
● When the protective function is activated (i. e. the frequency inverter switches off with an
error message), take the corresponding corrective action as described in the inverter man-
ual, then reset the inverter, and resume operation.
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