Mitsubishi Electric 800 Series Assembly & Installation Manuallines page 5

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 compensation systems or overload generators.
When driving a 690 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 inspection 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.
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
Provide a safety backup such as an emergency brake which will prevent the machine and equipment from hazardous conditions if the inverter
fails.
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 manual, then reset the inverter, and resume operation.
Maintenance, inspection and parts replacement
Do not carry out a megger (insulation resistance) test on the control circuit of the inverter. It will cause a failure.
Disposing of the inverter
Treat as industrial waste.
General instructions
Many of the diagrams and drawings in instruction manuals show the inverter without a cover, or partially open. Never run the inverter in this
status. Always replace the cover and follow instruction manuals when operating the inverter.
CAUTION
CAUTION
CAUTION
CAUTION