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Checklist Before Starting Operation - Mitsubishi Electric 800 Series Hardware Instruction Manual

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Checklist before starting operation

The FR-A800 series inverter and FR-CC2 converter unit are highly reliable products, but incorrect peripheral circuit making or
operation/handling method may shorten the product life or damage the products.
Before starting operation, always recheck the following points.
Crimp terminals are insulated.
The wiring between the power
supply (terminals R/L1, S/L2, T/
L3) and the motor (terminals U, V,
W) is correct.
No wire offcuts are left from the
time of wiring.
The main circuit cable gauge is
correctly selected.
The total wiring length is within the
specified length.
Countermeasures are taken
against EMI.
On the inverter's output side, there
is no power factor correction
capacitor, surge suppressor, or
radio noise filter installed.
When performing an inspection or
rewiring on the product that has
been energized, the operator has
waited long enough after shutting
off the power supply.
The inverter's output side has no
short circuit or ground fault
The circuit is not configured to use
the converter unit's input-side
magnetic contactor to start/stop
the inverter frequently.
The voltage applied to the I/O
signal circuits of the inverter and
the converter unit are within the
Use crimp terminals with insulation sleeves to wire the power supply and the
Application of power to the output terminals (U, V, W) of the inverter will damage
the inverter. Never perform such wiring.
Wire offcuts can cause a fault, failure, or malfunction. Always keep the inverter
and the converter unit clean.
When drilling mounting holes in an enclosure etc., take caution not to allow chips
and other foreign matter to enter the inverter or the converter unit.
Use an appropriate cable gauge to suppress the voltage drop to 2% or less.
If the wiring distance is long between the inverter and motor, a voltage drop in
the main circuit will cause the motor torque to decrease especially during the
output of a low frequency.
Keep the total wiring length within the specified length.
In long distance wiring, charging currents due to stray capacitance in the wiring
may degrade the fast-response current limit operation or cause the equipment
on the inverter's output side to malfunction. Pay attention to the total wiring
The input/output (main circuit) of the inverter or the converter unit includes high
frequency components, which may interfere with the communication devices
(such as AM radios) used near the inverter or the converter unit. In such case,
enable the EMC filter (turn ON the EMC filter ON/OFF connector) to minimize
Doing so will shut off the inverter output or damage the capacitor or surge
suppressor. If any of the above devices is connected, immediately remove it.
For a short time after the power-OFF, a high voltage remains in the smoothing
capacitor, and it is dangerous.
Before performing an inspection or rewiring, wait 10 minutes or longer after the
power supply turns OFF, then confirm that the voltage across the main circuit
terminals P/+ and N/- of the inverter is low enough using a digital multimeter, etc.
• A short circuit or ground fault on the inverter's output side may damage the
inverter module.
• Fully check the insulation resistance of the circuit prior to inverter operation
since repeated short circuits caused by peripheral circuit inadequacy or an
earth (ground) fault caused by wiring inadequacy or reduced motor insulation
resistance may damage the inverter module.
• Fully check the to-earth (ground) insulation and phase-to-phase insulation of
the inverter's output side before power-ON. Especially for an old motor or use
in hostile atmosphere, securely check the motor insulation resistance, etc.
Since repeated inrush currents at power ON will shorten the life of the inverter
and the converter unit, frequent starts and stops of the magnetic contactor must
be avoided. Turn ON or OFF the inverter's start (STF/STR) signal to run or stop
the inverter.
Application of a voltage higher than the permissible voltage to the I/O signal
circuits of the inverter or the converter unit or opposite polarity may damage the
I/O devices. Especially check the wiring to prevent the speed setting
potentiometer from being connected incorrectly to short circuit terminals 10E and
Refer to
3.6 Checklist before starting operation
Check by


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