Checklist Before Starting Operation - Mitsubishi Electric FR-A862-E Instruction Manual

Checklist before starting operation

3.6
Checklist before starting operation
The FR-A860 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.
Checkpoint
Crimp terminals are insulated.
The wiring between the power
supply (R/L1, S/L2, T/L3) and the
motor (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.
Precautions 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
occurring.
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 is within the
specifications.
The converter unit and the inverter
are correctly connected.
62
PRECAUTIONS FOR USE OF THE INVERTER
Countermeasure
Use crimp terminals with insulation sleeves to wire the power supply and the
motor.
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 an alarm, 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 and 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, the 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 is 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 length.
The input/output (main circuit) of the inverter and the converter unit includes
high frequency components, which may interfere with the communication
devices (such as AM radios) used near the inverter and the converter unit. In
such case, install a noise filter to minimize interference.
Doing so will cause the inverter to trip or the capacitor and surge suppressor to
be damaged. 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 tester, etc.
• A short circuit or earth (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/OFF the inverter's start signals (STF, STR) to run/
stop the inverter.
Application of a voltage higher than the permissible voltage to the I/O signal
circuits of the inverter and 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 5.
• Make sure that terminal P/+ of the converter unit and terminal P/+ of the
inverter, and terminal N/- of the converter unit and terminal N- of the inverter
are correctly connected.
Connecting the opposite polarity of terminals N/- and P/+ will damage the
inverter.
Also, do not install an MCCB across terminals P/+ and N/- (across terminals
P and P/+ or across N and N/-).
• Always connect terminal RDA of the converter unit and terminal MRS (X10)
of the inverter, and terminal SE of the converter unit and terminal SD
(terminal PC for source logic) of the inverter.
Not connecting these terminals may damage the converter unit.
Check
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