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3 PRECAUTIONS FOR USE OF THE CONVERTER UNIT
The FR-CC2 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 items:
Use crimping terminals with insulation sleeve to wire the power supply and the inverter.
After wiring, wire offcuts must not be left in the converter unit.
Wire offcuts can cause an alarm, failure or malfunction. Always keep the converter unit clean. When drilling mounting
holes in a control box etc., take care not to allow chips and other foreign matter to enter the converter unit.
Use cables of the appropriate size to make a voltage drop of 2 % maximum.
Refer to page 11 for the recommended cable size.
The overall wiring length should be within the prescribed length.
Especially for long distance wiring, the fast-response current limit function may be reduced or the equipment connected
to the converter unit's output side may malfunction or become faulty under the influence of a charging current due to the
stray capacity of the wiring. Therefore, note the overall wiring length. (Refer to page 12)
Electromagnetic wave interference
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 this case, activate the EMC filter (turn ON
the EMC filter ON/OFF connector) to minimize interference. (Refer to the Instruction Manual.)
Before starting wiring or other work after the product is operated, wait for at least 10 minutes after the power supply has
been switched off, and check that there are no residual voltage using a tester or the like. The capacitor is charged with
high voltage for some time after power off and it is dangerous.
If "EV" is displayed on the operation panel, turn OFF the 24 V external power supply before performing wiring.
Do not use the converter unit input side magnetic contactor (MC) to start/stop the inverter.
Since repeated inrush currents at power ON will shorten the life of the inverter and the converter unit (switching life is
about 1,000,000 times), frequent starts and stops of the MC must be avoided.
Always use the start signal (ON/OFF of STF and STR signals) to start/stop the inverter.
Do not apply a voltage higher than the permissible voltage to the converter unit I/O signal circuits.
Contact to the converter unit I/O signal circuits or opposite polarity may damage the I/O devices. Check the wiring
beforehand.
Converter unit's input side magnetic contactor (MC)
On the converter unit's input side, connect an MC for the following purposes. (Refer to the Instruction Manual.)
– To release the converter unit from the power supply when a fault occurs or when the drive is not functioning (e.g.
emergency stop operation).
– To prevent any accident due to an automatic restart at restoration of power 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.
Connect the converter unit and the inverter correctly.
– 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 for source logic) of the inverter.
Not connecting these terminals may damage the converter unit.
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