Mitsubishi Electric FR-A800, Instruction Manual

Page: 142 / 1042

Checklist before starting operation Precautions for use of the inverter
3 - 20
3.6 Checklist before starting operation
The FR-A800 series inverter is a highly reliable product, but incorrect peripheral circuit making or op-
eration/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.
2-25
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 an enclosure etc., take caution
not to allow chips and other foreign matter to enter the
inverter.
⎯
The main circuit cable gauge is
correctly selected.
Use an appropriate cable gauge to suppress a 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.
2-29
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.
2-29
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.
3-9
On the inverter's output side, none of
the power factor correction capacitor,
surge suppressor, or radio noise filter
is 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 once, the operator
has waited long enough after
shutting off the power supply.
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.
⎯
The inverter's output side has no
short circuit or ground fault
occurring.
앫
A short circuit or ground fault on the inverter's output side
may damage the inverter module.
앫
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.
앫
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.
⎯
Tab. 3-14: Checklist before starting operation (1)