2.2 Wiring
2-4
*1 Install a recommended molded case circuit breaker (MCCB) or earth leakage circuit breaker (ELCB)
(with overcurrent protective function) on the primary circuit of the inverter to protect wiring. Ensure that
the circuit breaker capacity is equivalent to or lower than the recommended capacity.
*2 Install a recommended magnetic contactor (MC) for each inverter to separate the inverter from the
power supply, apart from the MCCB or ELCB, when necessary. Connect a surge absorber in parallel
when installing a coil such as the MC or solenoid near the inverter.
*3 Inverters with a capacity of 1.5 kW or above have terminals R0 and T0.
To retain an alarm output signal issued by the protective function or to keep the keypad alive even if
the main power has shut down, connect these terminals to the power supply lines. Without power
supply to these terminals, the inverter can run.
*4 Usually no need to be connected. Use these terminals when the inverter is combined with a high
power-factor, regenerative PWM converter RHC series.
*5 When connecting an optional DC reactor (DCR), remove the jumper bar from the inverter main circuit
terminals P1 and P(+). LD-mode inverters with a capacity of 55 kW and inverters with 75 kW or above
are equipped with a DC reactor (DCR) as standard. Be sure to connect the DCR.
Use a DCR (optional) when the capacity of the power supply transformer exceeds 500 kVA and is 10
times or more the inverter rated capacity, or when there are thyristor-driven loads in the same power
supply line.
*6 Inverters with a capacity of 7.5 kW or below have a built-in braking resistor (DBR) between the
terminals P(+) and DB.
When connecting an optional external braking resistor (DBR), be sure to remove the built-in one.
*7 A grounding terminal for a motor. Use this terminal if needed.
*8 For control signal wires, use twisted or shielded-twisted wires. When using shielded-twisted wires,
ground the shield of them. To prevent malfunction due to noise, keep the control circuit wiring away
from the main circuit wiring as far as possible (recommended: 10 cm or more). Never install them in
the same wire duct. When crossing the control circuit wiring with the main circuit wiring, set them at
right angles.
*9 The connection diagram shows factory default functions assigned to digital input terminals [X1] to [X9],
[FWD] and [REV], transistor output terminals [Y1] to [Y4], and relay contact output terminals [Y5A/C]
and [30A/B/C].
*10 Switching connectors in the main circuits. For details, refer to Section 2.2.6 "Switching connectors."
*11 Slide switches on the control printed circuit board (control PCB). Use these switches to customize the
inverter operations. For details, refer to Section 2.2.7 "Setting up the slide switches."
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