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Wiring
2.2.2 Wiring of the main circuit
(1) Wiring instructions
1) Crimping terminals with insulation sleeves are recommended for use with the power and inverter cables.
2) Strictly observe the order of wiring in the connection example when performing wiring between the dedicated
stand-alone reactor and power regeneration common converter and wiring between the power supply and
terminals R/L11, S/L21, T/MC1. (Match the phase sequence of the power supply.) Incorrect connection will
damage the power regeneration common converter.
3) Make sure to connect the terminal R/L11, S/L21, T/MC1 to the power supply.
Running the inverter without connecting the terminals will damage the power regeneration common converter.
4) Connect a DC power supply between the power regeneration common converter and inverter with correct
polarity.
5) After wiring, wire off-cuts must not be left in the power regeneration common converter.
Wire off-cuts can cause an alarm, failure or malfunction. Always keep the power regeneration common
converter clean.
When drilling mounting holes in a control box etc., exercise care to prevent chips and other foreign matter from
entering the power regeneration common converter.
6) Electromagnetic wave interference
The input/output (main circuit) of the power regeneration common converter and inverter includes harmonic
components, which may interfere with the communication devices (such as AM radios) used near the power
regeneration common converter and inverter. In this case, install the FR-BIF optional radio noise filter (for use
in the input side only) or FR-BSF01 or FR-BLF line noise filter to minimize interference.
7) When rewiring after operation, make sure that the CHARGE lamp has gone off, and when more than 10
minutes have elapsed after power-off, check with a meter that the voltage is zero. After that, start rewiring work.
For some time after power-off, there is a dangerous voltage in the capacitor.
8) Be sure to connect terminal RDY of the FR-CV to the X10 or MRS signal assigned terminal of the inverter, and
connect terminal SE of the FR-CV to terminal SD of the inverter. Without proper connecting, FR-CV will be
damaged.
Notes on Grounding
z To prevent an electric shock, the dedicated stand-alone reactor, power regeneration common converter, inverter and
motor must be grounded.
z Use the dedicated ground terminal to ground the power regeneration common converter. (Do not use the screws in
the case, chassis, etc.)
z Use the reactor mounting screw to earth the dedicated stand-alone reactor.
Use the screw in the marked .
z The ground cable should be as thick as possible. Its gauge should be equal to or larger than those indicated in the
following table. The grounding point should be as near as possible to the power regeneration common converter to
minimize the ground cable length.
(Unit: mm
2
)
Capacity
Ground Cable Gauge
200V class 400V class
7.5kW (10HP) 5.5 3.5
11kW, 15kW (15HP, 20HP) 14 8
22kW to 37kW
(30 to 50HP)
22 14
55kW (75HP) 38 22