Toshiba VF-A7 instruction manual Prevention of radio noise

Warning

Prohibited

･Do not connect any device or unit with a built-in capacitor (noise filter, surge suppressor, etc.) to output terminals (on the motor side), or it could cause the risk of a fire.

■Prevention of radio noise

Prevent interference, such as radio noise, separately install and bind cables connected to the power supply-side terminals (R/L1, S/L2 and T/L3) of the main circuit and those connected to the motor-side terminals (U/T1, V/T2 and W/T3).

■Power supply to the control and main circuits (for the 22kW and smaller models)

You want to keep the control circuit alive when the main circuit shuts off because of trouble or tripping, you can use an optional power supply unit to supply power to the control circuit separately from the main circuit.

■Notes on wiring

･When connecting wires to the main circuit terminals, use crimp contacts because there is no large space between terminals, and attach them in order so that they do not come into contact with each other.

･Be sure to ground the inverter by connecting wires of the following size or larger to the grounding terminal G/E.(UL standard)

Voltage	Applicable motor	Grounding wire size
class		AWG(cross-section[mm2])
	0.4～5.5kW	12(3.5)
	7.5kW	10(5.5)
	11～15kW	6(14)
200V	18.5～22kW	4(22)
	30～37kW	2(38)
	45～55kW	2/0(60)
	75～90kW	4/0(100)
	0.75～11kW	12(3.5)
	15kW	10(5.5)
	18.5kW	8(8)
	22～30kW	6(14)
400V	37～55kW	4(22)
	75kW	2(38)
	110～132kW	2/0(60)
	160～220kW	4/0(100)
	280kW	300(150)

For the 200V 0.4~7.5kW models and the 400V 0.75~7.5kW models, a grounding screw (M5) is provided in the wiring hole cover, in addition to a grounding terminal.

･Refer to the table in 9.1 for wire sizes.

･Wire sizes listed in 9.1 is for the case the wire length is below 30m. To use wires longer than 30m, you need larger cables than listed in 9.1.

･Tighten a terminal stand screw with specified bolting torque.

Recommended bolting torque for terminal stand

	N・m	lb・ins
M3	0.5	4.4
M4	1.2	11
M5	2.4	21
M6	4.0	35
M8	8.0	71
M10	16	142
M12	32	283
	B-2