Fuji Electric frenic-hvac Instruction Manual page 24

*1 Install a recommended molded case circuit breaker (MCCB) or residual-current-operated protective device
(RCD)/earth leakage circuit breaker (ELCB) (with overcurrent protection function) in 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 magnetic contactor (MC) for each inverter to separate the inverter from the power supply, apart from the
MCCB or RCD/ELCB, when necessary.
Connect a surge absorber in parallel when installing a coil such as the MC or solenoid near the inverter.
*3 To retain an alarm output signal ALM issued on inverter's programmable output terminals 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.
Even without power supply to these terminals, the inverter can run.
When these terminals are connected to the power supply lines, shutting down the MC being used for main power
ON/OFF cannot power off all live parts. Be sure to shut down all circuits with a disconnecting switch (DS).
*4 A grounding terminal for a motor. Use this terminal if needed.
*5 For control signal wires, use twisted or shielded-twisted wires. When using shielded-twisted wires, connect the shield
of them to the common terminals of the control circuit. 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.
*6 The connection diagram shows factory default functions assigned to digital input terminals [X1] to [X7], [FWD] and
[REV], transistor output terminals [Y1] to [Y4], and relay contact output terminals [Y5A/C] and [30A/B/C].
*7 Slide switches on the control printed circuit board (control PCB). Use these switches to customize the inverter
operations. For details, refer to Section 2.2.6 "Setting up the slide switches."
*8 When the Enable function is not to be used, short-circuit terminals [EN1] and [PLC] and terminals [EN2] and [PLC]
using jumper wires. For opening and closing the hardware circuit between terminals [EN1] and [PLC] and between
[EN2] and [PLC], use safety components such as safety relays and safety switches. Be sure to use shielded wires
exclusive to terminals [EN1] and [PLC] and terminals [EN2] and [PLC]. (Do not put them together with any other
control signal wire in the same shielded core.)
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