Toshiba VF-A7 instruction manual Common specifications

4) Common specifications

Control specifications

Item	Description
Control method	Sinusoidal PWM control
Output voltage	Main circuit voltage feedback control (Automatic regulation, "fixed" and "control off"
adjustment	selections possible)
Output frequency range	0.01 to 400Hz, set to 0.01 to 80Hz by default, max. frequency adjustable from 30 to 400Hz
Frequency setting	0.01Hz: operation panel input (60Hz base), 0.015Hz: analog input (60Hz base, 12/16
resolution	bit/0-10Vdc)
Frequency	+/-0.2% of the max. output frequency (25+/-10°C): analog input, +/-0.01% (25+/-
precision	10°C): digital input
Voltage/	Constant V/f, variable torque, automatic torque boost, vector control and automatic energy-saving
frequency	control, base frequency 1･2･3･4 adjustment (25 to 400Hz) arbitrary V/f 5-point settings, torque boost
characteristic	adjustment (0 to 30%), start-up frequency adjustment (0 to 10Hz), end frequency adjustment (0 to 30Hz)
Frequency setting	3kΩ potentiometer (1 to 10kΩ-potentiometer connection also possible), 0 to 10Vdc
signal	(input impedance Zin: 33kΩ), 0 to +/-10Vdc (Zin: 67kΩ), 4 to 20mAdc (Zin: 500Ω)
Terminal board reference	2 sources can be set from a total of seven types, including analog input (RR, VI, II,
frequency input	RX, RX2), pulse and binary/BCD (*RX2 and binary/BCD: optional)
Frequency jump	Can be set in three places, jump frequency and band setting
Upper/lower limit	Upper limit frequency: 0 to maximum frequency, lower limit frequency: 0 to upper
frequencies	limit frequency
PWM carrier	Adjustable within a range of 0.5 to 15kHz
	(0.5 to 8kHz for 200V 55kW model and 400V 75kW model,
frequency selections
	0.5 to 5kHz for 200V 75-90kW models and 400V 110-280kW models)
PID control	Proportional gain, integral time, anti-hunting gain, filter delay adjustments
Torque control	Voltage control reference: DC0 to +/-10V

	Acceleration/	0.01 to 6000 sec., acceleration/deceleration time selectable from among 1, 2, 3 and 4, automatic
	deceleration time	acceleration/deceleration function, S-pattern acceleration/deceleration patterns 1 and 2 adjustment
	DC injection	Braking start frequency: adjustment (0 to 120Hz), braking current adjustment: ( 0 to 100%), braking time
	braking	adjustment: (0 to 10 sec.), emergency stop braking function, motor shaft stationary control function
	Forward/reverse	Forward run F-CC "closed", reverse when R-CC "closed", reverse when both "closed"
	run (*1)	coast stop when ST-CC "opened", Emergency stop from panel or terminal block
	Jog run (*1)	Jog run from panel with JOG mode selection. Terminal block operation possible with
		parameter settings.
	Preset-speed	Set frequency +15-speed preset speeds possible with open/close combinations. S1,
		S2,S3, S4 and CC Acceleration/deceleration time, torque limit and V/f selectable on
	operation (*1)
		a frequency.
specifications	Retry	When a protective function activities, after main circuit devices are checked, running
		restarts. Settable to a max. of 10times. wait time adjustment (0 to 10sec)
	Soft-stall	Automatic load reduction control during overload (Default setting: OFF)
	Cooling fan ON/OFF	Fan is automatically stopped, When not necessary to ensure to extended life time.
	Panel key	Prohibit functions such as reset only or monitor only etc., can be selected. All key
Operation	operation ON/OFF	operations can be also prohibited. A protection reset function which requires special
	switching	operation to enable it is available.
	Regenerative power	Operation is continued even during momentary power failure using regenerative
	ride-through control	energy from the motor. (Default setting: OFF)
	Auto-restart in	The motor can be restarted at the same speed in the same direction it run under no-
		load conditions before stop. (Default setting: OFF)
	Simple pattern	32 patterns in 4 groups (8 pattern in each group) can be set according to 15-speed
		operation frequency. Up to 32 patterns of operation, control from terminal
	run
		board/repeated operation possible.
	Commercial power/	Power supply to motor, switchable between commercial power and inverter
	inverter switching
	High-speed run at	With this function, the load applied to the motor can be monitored. Its rotating speed
	low-load	is increased to improve the operation efficiency when the load applied to it is low.
	Drooping function	This function prevent a load from being imposed to a single inverter because of
		imbalance, when more than one inverter is used in combination to drive the load.
	Override function	Preset frequency control value adjustable by signals from an external control unit
	Protective	Stall prevention, current limit, over-current, over-voltage, load-side short-circuit, load-side ground
Protection		fault(*7), undervoltage, momentary power failure (15ms or longer), regeneration power ride-through
	function	control, electronic thermal overload protection, armature over-current during start-up, load-side
		over-current during start-up, dynamic braking resistor overload, heat sink overheat, emergency stop
	Electronic thermal	Standard motor/constant-torque VF motor switching, electronic thermal stall
	characteristic	prevention operational level adjustment
	Reset	Reset triggered by closing 1a-contact (or opening 1b-contact), by control panel operation, or
		by turning on the power after turning off temporarily. Tripped state retention and clear settings

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