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3. PRECAUTIONS FOR USE OF THE CONVERTER UNIT
3.4 Checklist before starting operation
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3.4
Checklist before starting operation
This product 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
Crimp terminals are insulated.
Use crimp terminals with insulation sleeves to wire the power supply and the
inverter.
—
No wire offcuts are left from the
time of wiring.
Wire offcuts can cause an alarm, failure or malfunction. Always keep 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 converter unit.
—
The main circuit cable gauge is
correctly selected.
Use an appropriate cable gauge to suppress the voltage drop to 2% or less.
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 cause the equipment on the converter unit's output side to malfunction. Pay
attention to the total wiring length.
Countermeasures are taken
against EMI.
The input/output (main circuit) of the converter unit includes high frequency
components, which may interfere with the communication devices (such as AM
radios) used near the converter unit. In such case, enable the EMC filter (turn
ON the EMC filter ON/OFF connector) to minimize interference.
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 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 converter unit is low enough using a digital
multimeter, etc.
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The voltage applied to the
converter unit I/O signal circuits is
within the specifications.
Application of a voltage higher than the permissible voltage to the converter unit
I/O signal circuits or opposite polarity may damage the I/O devices. Check the
wiring beforehand.
A magnetic contactor (MC) is
installed on the converter unit's
input side.
On the converter unit's input side, connect an MC for the following purposes:
• To disconnect the converter unit from the power supply at activation of a
protective function or at malfunctioning of the driving system (emergency stop,
etc.).
• To prevent any accident due to an automatic restart at power restoration after
an inverter stop made by a power failure.
• To separate the converter unit from the power supply to ensure safe
maintenance and inspection work.
The specifications and rating
match the system requirements.
Make sure that the specifications and rating match the system requirements.
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The converter unit and the inverter
are correctly connected.
• Make sure that the terminal P/+ of the converter unit and the terminal P/+ of the
inverter, and the terminal N/- of the converter unit and the 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 the terminals P/+ and N/- (across
terminals P and P/+ or across N and N/-).
• Always connect the terminal RDA of the converter unit and the terminal MRS
(X10) of the inverter, and the terminal SE of the converter unit and the terminal
SD (terminal PC in the source logic) of the inverter. Not doing so may lead to
damage of the converter unit.
