Checklist Before Starting Operation - Mitsubishi Electric FR-CC2-P Instruction Manual

3.4

Checklist before starting operation

The converter unit 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
Crimp terminals are insulated.
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.
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 voltage applied to the converter
unit I/O signal circuits is within the
specifications.
A magnetic contactor (MC) is installed
on the converter unit's input side.
The specifications and rating match
the system requirements.
The converter unit and the inverter
are correctly connected.
The RS-485 terminals are correctly
connected.
Countermeasure
Use crimp terminals with insulation sleeves to wire the power supply and the
inverter.
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.
Use an appropriate cable gauge to suppress the voltage drop to 2% or less.
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.
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, activate the EMC
filter (turn ON the EMC filter ON/OFF connector) to minimize interference.
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
tester, etc.
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.
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.
If using an MC for emergency stop during operation, select an MC regarding
the converter unit input side current as JEM1038-AC-3 class rated current.
Make sure that the specifications and rating match the system
requirements.
• 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 master converter unit and terminal
MRS (X10) of the master inverter, and terminal SE of the master converter
unit and terminal SD (PC for source logic) of the master inverter.
Not connecting these terminals may damage the converter unit.
Always connect wiring between the RS-485 terminals of the master/slave
converter units. If the RS-485 communication is not performed correctly, the
parallel operation cannot be made.
PRECAUTIONS FOR USE OF THE CONVERTER UNIT
Checklist before starting operation
Refer
page
—
—
37
37
65
—
43
70
—
34
53
Check
to
by user
3
71