Thank you for choosing this Mitsubishi Inverter.
This Instruction Manual provides instructions for advanced use of the FR-A700 series inverters.
Incorrect handling might cause an unexpected fault. Before using the inverter, always read this instruction manual and the Installation
Guideline [IB-0600254ENG] packed with the product carefully to use the equipment to its optimum.
This section is specifically about safety matters
Do not attempt to install, operate, maintain or inspect the inverter until you
have read through instruction manual and appended documents carefully and
can use the equipment correctly. Do not use the inverter until you have a full
knowledge of the equipment, safety information and instructions. In this
instruction manual, the safety instruction levels are classified into
"WARNING" and "CAUTION".
Assumes that incorrect handling may cause hazardous
conditions, resulting in death or severe injury.
Assumes that incorrect handling may cause
hazardous conditions, resulting in medium or slight
injury, or may cause physical damage only.
Note that even the
according to conditions. Please follow strictly the instructions of both levels
because they are important to personnel safety.
1. Electric Shock Prevention
• While power is on or when the inverter is running, do not open the front cover.
Otherwise you may get an electric shock.
• Do not run the inverter with the front cover or wiring cover removed.
Otherwise, you may access the exposed high-voltage terminals or the charging
part of the circuitry and get an electric shock.
• Even if power is off, do not remove the front cover except for wiring or periodic
inspection.You may access the charged inverter circuits and get an electric shock.
• Before starting wiring or inspection, check to make sure that the operation panel
indicator is off, wait for at least 10 minutes after the power supply has been
switched off, and check that there are no residual voltage using a tester or the
like. The capacitor is charged with high voltage for some time after power off and
it is dangerous.
• This inverter must be earthed (grounded). Earthing (Grounding) must conform to
the requirements of national and local safety regulations and electrical codes.
(NEC section 250, IEC 536 class 1 and other applicable standards)
• Any person who is involved in the wiring or inspection of this equipment should
be fully competent to do the work.
• Always install the inverter before wiring. Otherwise, you may get an electric shock
or be injured.
• Perform setting dial and key operations with dry hands to prevent an electric
shock. Otherwise you may get an electric shock.
• Do not subject the cables to scratches, excessive stress, heavy loads or
pinching. Otherwise you may get an electric shock.
• Do not replace the cooling fan while power is on. It is dangerous to replace the
cooling fan while power is on.
• Do not touch the printed circuit board with wet hands. You may get an electric shock.
• When measuring the main circuit capacitor capacity, the DC voltage is applied to
the motor for 1s at powering off. Never touch the motor terminal, etc. right after
powering off to prevent an electric shock.
2. Fire Prevention
• Install the inverter on an incombustible wall without holes, etc.
Mounting it to or near combustible material can cause a fire.
• If the inverter has become faulty, switch off the inverter power.
A continuous flow of large current could cause a fire.
• When using a brake resistor, make up a sequence that will turn off power when
an alarm signal is output.
Otherwise, the brake resistor may excessively overheat due to damage of the
brake transistor and such, causing a fire.
• Do not connect the resistor directly to the DC terminals P/+ and N/-. This could cause
3. Injury Prevention
• Apply only the voltage specified in the instruction manual to each terminal.
Otherwise, burst, damage, etc. may occur.
• Ensure that the cables are connected to the correct terminals. Otherwise, burst,
damage, etc. may occur.
• Always make sure that polarity is correct to prevent damage, etc. Otherwise,
burst, damage, etc. may occur.
• While power is on or for some time after power-off, do not touch the inverter as it
is hot and you may get burnt.
4. Additional Instructions
Also note the following points to prevent an accidental failure, injury, electric
(1) Transportation and installation
• When carrying products, use correct lifting gear to prevent injury.
• Do not stack the inverter boxes higher than the number recommended.
• Ensure that installation position and material can withstand the weight of the
inverter. Install according to the information in the instruction manual.
• Do not install or operate the inverter if it is damaged or has parts missing. This can
result in breakdowns.
• When carrying the inverter, do not hold it by the front cover or setting dial; it may
fall off or fail.
• Do not stand or rest heavy objects on the product.
• Check the inverter mounting orientation is correct.
• Prevent other conductive bodies such as screws and metal fragments or other
flammable substance such as oil from entering the inverter.
• As the inverter is a precision instrument, do not drop or subject it to impact.
• Use the inverter under the following environmental conditions. Otherwise, the
inverter may be damaged.
LD, ND (initial
-10°C to +50°C (14°F to 122°F)(non-freezing)
-10°C to +40°C (14°F to 104°F)(non-freezing)
90% RH or less (non-condensing)
-20°C to +65°C
Indoors (free from corrosive gas, flammable gas, oil
mist, dust and dirt)
Maximum 1000m (3280.80feet) above sea level for
standard operation. After that derate by 3% for every
extra 500m (1640.40feet) up to 2500m (8202feet)
*1 Temperature applicable for a short time, e.g. in transit.
or less for the FR-A740-03250 or more.
level may lead to a serious consequence
(-4°F to 149°F)
• Do not install a power factor correction capacitor or surge suppressor/radio
noise filter (capacitor type filter) on the inverter output side.
• The connection orientation of the output cables U, V, W to the motor will affect
the direction of rotation of the motor.
(3) Test operation and adjustment
• Before starting operation, confirm and adjust the parameters. A failure to do so
may cause some machines to make unexpected motions.
• When you have chosen the retry function, stay away from the equipment as it
will restart suddenly after an alarm stop.
• Since the
key is valid only when functions are set (refer to page 302),
provide a circuit and switch separately to make an emergency stop (power off,
mechanical brake operation for emergency stop, etc).
• Make sure that the start signal is off before resetting the inverter alarm. A failure
to do so may restart the motor suddenly.
• The load used should be a three-phase induction motor only. Connection of any
other electrical equipment to the inverter output may damage the inverter as well as
• Performing pre-excitation (LX signal and X13 signal) under torque control (real
sensorless vector control) may start the motor running at a low speed even
when the start command (STF or STR) is not input. The motor may run also at a
low speed when the speed limit value = 0 with a start command input. Perform
pre-excitation after making sure that there will be no problem in safety if the
• Do not modify the equipment.
• Do not perform parts removal which is not instructed in this manual. Doing so
may lead to fault or damage of the inverter.
• The electronic thermal relay function does not guarantee protection of the motor
• Do not use a magnetic contactor on the inverter input for frequent starting/
stopping of the inverter.
• Use a noise filter to reduce the effect of electromagnetic interference. Otherwise
nearby electronic equipment may be affected.
• Take measures to suppress harmonics. Otherwise power supply harmonics from
the inverter may heat/damage the power factor correction capacitor and
• When a 400V class motor is inverter-driven, please use an insulation-enhanced
motor or measures taken to suppress surge voltages. Surge voltages
attributable to the wiring constants may occur at the motor terminals,
deteriorating the insulation of the motor.
• When parameter clear or all clear is performed, reset 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.
• In addition to the inverter's holding function, install a holding device to ensure
• 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.
(5) 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 input 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, take the corresponding corrective
action, then reset the inverter, and resume operation.
(6) Maintenance, inspection and parts replacement
• Do not carry out a megger (insulation resistance) test on the control circuit of the
(7) Disposing of the inverter
• Treat as industrial waste.
Many of the diagrams and drawings in this instruction manual show the inverter
without a cover, or partially open. Never run the inverter in this status. Always
replace the cover and follow this instruction manual when operating the