Checklist before starting operation
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PRECAUTIONS FOR USE OF THE INVERTER
3.6 Checklist before starting operation
The FR-A800 series inverter is a highly reliable product, but incorrect peripheral circuit making or operation/handling method
may shorten the product life or damage the product.
Before starting operation, always recheck the following points.
Checkpoint Countermeasure
Refer
to page
Check
by user
Crimping terminals are insulated.
Use crimping terminals with insulation sleeves to wire the power supply and
the motor.
-
The wiring between the power
supply (R/L1, S/L2, T/L3) and the
motor (U, V, W) is correct.
Application of power to the output terminals (U, V, W) of the inverter will
damage the inverter. Never perform such wiring.
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No wire offcuts are left from the
time of wiring.
Wire offcuts can cause an alarm, failure or malfunction. Always keep the
inverter clean.
When drilling mounting holes in a wall etc., take caution not to allow chips and
other foreign matters to enter the inverter.
-
The main circuit cable gauge is
correctly selected.
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.
31
The total wiring length is within the
specified length.
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 length.
31
Countermeasures are taken
against EMI.
The input/output (main circuit) of the inverter includes high frequency
components, which may interfere with the communication devices (such as
AM radios) used near the inverter. In such case, activate the EMC filter (turn
ON the EMC filter ON/OFF connector) to minimize interference.
80
On the inverter's output side, there
is no power factor correction
capacitor, surge suppressor, or
radio noise filter installed.
Such installation 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.
-
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.
For some 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.
-
The inverter's output side has no
short circuit or ground fault
occurring.
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 a
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, make sure to check the motor insulation resistance, etc.
-
The circuit is not configured to use
the inverter's input-side magnetic
contactor to start/stop the inverter
frequently.
Since repeated inrush currents at power ON will shorten the life of the
converter circuit, 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.
86
The voltage applied to the inverter
I/O signal circuits is within the
specifications.
Application of a voltage higher than the permissible voltage to the inverter I/O
signal circuits 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.
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