Mitsubishi Electric 800 Series Installation Manualline page 5

Operation
l When you have chosen the retry function, stay away from the equipment as it will restart suddenly after an alarm stop.
l Since pressing the
make an emergency stop (power off, mechanical brake operation for emergency stop, etc).
l Make sure that the start signal is off before resetting the inverter alarm. A failure to do so may restart the motor suddenly.
l Do not use a PM motor for an application where the PM motor is driven by its load and runs at a speed higher than the maximum
motor speed.
l The inverter can be started and stopped via the serial port communications link or the field bus. However, please note that depending
on the settings of the communications parameters it may not be possible to stop the system via these connections if there is an error
in the communications system or the data line. In configurations like this it is thus essential to install additional safety hardware that
makes it possible to stop the system in an emergency (e.g. controller inhibit via control signal, external motor contactor etc). Clear and
unambiguous warnings about this must be posted on site for the operating and service staff.
l Use this inverter only with three-phase induction motors or with a PM motor. Connection of any other electrical equipment to the
inverter output may damage the inverter as well as the equipment.
l Performing pre-excitation (LX signal and X13 signal) under torque control may start the motor running at a low speed even when the
start signal (STF or STR) is not input. This product with the start command ON may also rotate the motor at a low speed when the
speed limit value is set to zero. Confirm that the motor running does not cause any safety problems before performing pre-excitation.
l Do not modify the equipment.
l Do not perform parts removal which is not instructed in this manual. Doing so may lead to fault or damage of the inverter.
l 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.
l Do not use a magnetic contactor on the inverter input for frequent starting/stopping of the inverter. Otherwise, the life of the inverter
decreases.
l 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.
l Take appropriate measures regarding harmonics. Otherwise this can endanger compensation systems or overload generators.
l When driving a 400V 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.
l Use a motor designed for inverter operation. (The stress for motor windings is bigger than in line power supply).
l When parameter clear or all clear is performed, set again the required parameters before starting operations. Each parameter returns
to the initial value.
l The inverter can be easily set for high-speed operation. Before changing its setting, fully examine the performances of the motor and
machine.
l 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.
l Before running an inverter which had been stored for a long period, always perform inspection and test operation.
l For prevention of damage due to static electricity, touch nearby metal before touching this product to eliminate static electricity from
your body.
l Only one PM motor can be connected to an inverter.
l A PM motor must be used under PM motor control. When operating with PM motor control, a synchronous motor, induction motor or
synchronous induction motor may only be used when it is a PM motor.
l Do not connect a PM motor under the induction motor control settings (initial settings). Do not use an induction motor under the PM
motor control settings. It will cause a failure.
l In the system with a PM motor, the inverter power must be turned ON before closing the contacts of the contactor at the output side.
l When the emergency drive operation is performed, the operation is continued or the retry is repeated even when a fault occurs, which
may damage or burn the inverter and motor. Before restarting the normal operation after using the emergency drive function, make
sure that the inverter and motor have no fault.
l To maintain the security (confidentiality, integrity, and availability) of the inverter and the system against unauthorized access, DoS
attacks, computer viruses, and other cyberattacks from external devices via network, take appropriate measures such as firewalls,
virtual private networks (VPNs), and antivirus solutions. We shall have no responsibility or liability for any problems involving inverter
trouble and system trouble by DoS attacks, unauthorized access, computer viruses, and other cyberattacks.
l 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.
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DoS: A denial-of-service (DoS) attack disrupts services by overloading systems or exploiting vulnerabilities, resulting in a denial-of-
service (DoS) state.
Emergency stop
l Provide a safety backup such as an emergency brake which will prevent the machine and equipment from hazardous conditions if the
inverter fails.
l 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.
l 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 manual, then reset the inverter, and resume operation.
key may not stop output depending on the function setting status, provide a circuit and switch separately to
WARNING
CAUTION
CAUTION
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