Fuji Electric FRENIC-HVAC Manual page 101

*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 Terminals [Y1] to [Y4] (transistor outputs) support both SINK and SOURCE modes. The diagrams below show the
examples of circuit connection between the transistor output of the inverter's control circuit and a PLC.
Photocoupler
(a) PLC serving as SINK
*8 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."
*9 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.)
*10 It is not normally necessary to connect anything to these terminals. They are used when connecting to a DC bus. （ on
200Vclass series inverters of 22kW (30HP) or above and 400V ones of 45kW (60HP) or above)
*11 These are the main circuit switching connectors. For more information, see "2.2.5 Switching connectors" in this
instruction manual.
Switching connectors
Supply voltage switching connector (CN UX) (for 400 V class series inverters of 45 kW (60HP) or above)
Inverters with a capacity of 400 V class series inverters of 45 kW (60HP) or above have a supply voltage
switching connector (CN UX). If the power supply being connected to the main circuit power input terminals
(L1/R, L2/S, L3/T) or auxiliary main circuit power input terminals (R1, T1) satisfies the conditions listed below,
change the CN UX connector to the U2 position. Otherwise, use the connector in the factory-default U1 position.
For more detailed switching guidelines, see Figures 2.5 and 2.6 on the following page.
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<Control circuit>
Programmable
logic controller
Current
[Y1]
SINK input
to
[Y4]
31 to
35 V
[CMY]
C0
Photocoupler
(b) PLC serving as SOURCE
2-17
<Control circuit>
Programmable
logic controller
C0
Current
[Y1]
to
[Y4]
31 to
35 V
[CMY]
SOURCE input