Fuji Bikes 5000G11S/P11S instruction manual Connecting the main circuit and ground terminals

2-3-2 Connecting the main circuit and ground terminals

Table 2-3-1 Functions of main circuit terminals and ground terminals

Symbol	Terminal name	Description
L1/R, L2/S, L3/T	Main circuit power terminal	Connects a 3-phase power supply.
U, V, W	Inverter output terminal	Connects a 3-phase motor.
	Auxiliary control-power	Connects a backup AC power supply to the
R0, T0		control circuit. (Not supported for inverter of 1HP
	input terminal
		or less)
P1, P (+)	DC reactor connecting	Connects the optional power-factor correcting DC
	terminal	reactor.
P (+), DB	External braking resistor	Connects the optional external braking resistor.
	connecting terminal	(For inverter of 10HP or less)
P (+), N (-)	DC link circuit terminal	Supplies DC link circuit voltage to the external
		braking unit (option) or power regeneration unit
		(option).
G	Inverter ground terminal	Grounds the inverter chassis (case) to the earth.

(1)Main circuit power terminals (L1/R, L2/S, L3/T)

①Connect these terminals to the power supply via a molded-case circuit breaker or a ground-fault circuit interrupter for circuit (wiring) protection. Phase-sequence matching is unnecessary.

②To ensure safety, a magnetic contactor should be connected to disconnect the inverter from the power supply when the inverter protective function activates.

③Use control circuit terminal FWD/REV or the RUN/STOP key on the keypad panel to start or stop the inverter. The main circuit power should be used to start or stop the inverter only if absolutely necessary and then should not be used more than once every hour.

④If you need to connect these terminals to a single-phase power supply, please contact the factory.

(2)Inverter output terminals (U, V, W)

①Connect these terminals to a 3-phase motor in the correct phase sequence. If the direction of motor rotation is incorrect, exchange any two of the U, V, and W phases.

②Do not connect a power factor correction capacitor or surge absorber to the inverter output.

③If the cable from the inverter to the motor is very long, a high-frequency current may be generated by stray capacitance between the cables and result in an overcurrent trip of the inverter, an increase in leakage current, or a reduction in current indication precision.

When a motor is driven by a PWM-type drive, the motor terminals may be subject to surge voltage generated by drive element switching. If the motor cable (with 460V series motors, in particular) is particularly long, surge voltage will deteriorate motor insulation. To prevent this, use the following guidelines:

Inverters 7.5 HP and larger

Motor Insulation Level	1000V	1300V	1600V
460 VAC Input Voltage	66 ft (20 m)	328 ft (100 m)	1312 ft (400 m) *
230 VAC Input Voltage	1312 ft (400 m) *	1312 ft (400 m) *	1312 ft (400 m) *
Inverters 5 HP and smaller
Motor Insulation Level	1000V	1300V	1600V
460 VAC Input Voltage	66 ft (20 m)	165 ft (50 m) *	165 ft (50 m) *
230 VAC Input Voltage	328 ft (100 m) *	328 ft (100 m) *	328 ft (100 m) *

* For this case the cable length is determined by secondary effects and not voltage spiking.

Note: When a motor protective thermal O/L relay is inserted between the inverter and the motor, the thermal O/L relay may malfunction (particularly in the 460V series), even when the cable length is 165 feet (50m) or less. To correct, insert a filter or reduce the carrier frequency. (Use function code “F26 Motor sound”.)

2-8