AC drives - GK3000 series general purpose drives

GK3000 series AC drives are manufactured based on sensorless vector control, current control, V/F control and vector space control techniques to change the AC asynchronous motor running speed by controlling the output frequency. GK3000 AC drives adopt world-class space voltage SPWM control technology, built-in current control loop to achieve high-precision closed-loop control mode for high accuracy requirements. According to thousands of China local customers' feedback, Gozuk variable frequency drives are suitable for paper industry, constant water pressure supply, metallurgy and other high control precise requirement industries.

Power range: 1 phase 0.2kW - 3.7kW
                      3 phase 0.75kW - 400kW

Gozuk AC drive general specifications

Item		Description
I/O features	Input voltage range	Single phase 220 - 240V +15% for single phase drives Three phase 380 - 440V +15% for three phase drives
	Input frequency	50Hz/60Hz
	Output voltage range	0 - rated input voltage, three phase
	Output frequency range	0.00~400.00Hz
Control features	Control mode	Speed sensorless slip vector control, open loop V/F control
	Over loading capacity	150% of rated current for 1 minute, 200% of rated current for 0.5s;
	Speed regulation range	1:100
	Speed control accuracy	≤±0.5% of rating synchronous speed
	Frequency precision	Digital setting: max frequency *± 0.01%; analog setting: max frequency *± 0.5%
	Frequency resolution	Analog setting: 0.1% of max frequency Digital setting: 0.01Hz Exterior pulse: 0.5% of max. frequency Digital keyboard settings: 0.01Hz
	Start torque	150% of rating torque at 1 Hz
	Torque boost	Automatic torque boost, manual torque boost 0.1%~20.0%
	V/F curve	Set rating frequency randomly at range of 5~400Hz, can choose constant torque, degressive torque 1, degressive torque 2, degressive torque 3 and user defined V/F curve in total 5
	Accelerating decelerating curve	Modes: straight line accelerating decelerating, S curve accelerating decelerating and automatic Acc/Dec mode; 4 kinds of Acc/Dec time (unit of minute/second can be optioned), max is 6000 minutes.
	Brake	Power consumption brake: Interior or exterior braking resistance DC brake: Optional start-up and stop, action frequency 0~15Hz, action volt. 0~15%, action time 0~20.0s
	Jog	Jog frequency range：0.50Hz~50.00Hz; jog accelerating/decelerating time 0.1~60.0s can be set
	Multi-section speed running	Realized by interior PLC or control terminal
	Interior PID controller	Be convenient to make closed-loop system
	Automatic energy saving running	Optimize V/F curve automatically based on the load to realize power save running
	Automatic volt. regulation (AVR)	Can keep constant output volt. When power source voltage varies.
	Automatic current limiting	Limit running current automatically to avoid frequent over-current which will cause trip
Running function	Running order specified channel	Keypad provision, control terminal provision, serial port provision
	Running frequency specified channel	Digital provision, analog provision, impulse provision, serial port provision, combined provision, can be switched at any time by kinds of method.
	pulse output channel	Impulse square wave signal output of 0~20KHz can realize output of physical parameter such as setting frequency, output frequency and etc.
	Analog output channel	2 channel of analog signal output, each channel can be 4~20mA or 0~10V, through them the variable frequency ac drive can realize output of physical parameter such as setting frequency, output frequency and etc.
	Special channel	2-way 0-1A and 2-way 0-10V isolated analog input signal
Keypad	LED display	Can display setting frequency, output frequency, output voltage, output current etc. in total 20 kinds of parameter
	Button lock	Lock all of the buttons
	Parameters copy	Parameters can be quickly copied. by using of keyboard and remote-control keypad
Configuration	Defending grade	IP20
	Cooling mode	By fan with automatic temperature control
Environmental Constraint	Temperature	–10℃ ~ +40℃; AC drive will be derated if ambient temperature exceeds 40℃; each rise 1℃, the derate will be 5%
	Humidity	5%-95%, without condensation
	Altitude	≤1000m; ac drive will be derated if above 1000m
	Impingement and oscillation	Normal running: ＜5.9m/s2 (0.6g); Transportation: ＜15m/s2(1.5g)
	Store environment	–40℃ ~ +70℃; no dust, no corrosive gas, no direct sunlight

What is an AC drive?

Definition: AC drive is a power control conversion device to change commercial power supply (50Hz or 60Hz) to another frequency power by inner power semiconductor on/off behaviors, to control AC motors in variable speed operations. Variable frequency control is changing the frequency supply to the motor stator windings to achieve variable speed control purpose.

AC Drive also called frequency inverter, variable frequency drive (VFD) and AC motor speed drive etc. it allows the electric motor smooth start up, control startup current growing from zero to motor rated current, reduce impact to the power grid and avoid the motor being burned out, also provide protect in  motor running process. Besides these functions, the main function of AC drive is adjusting the motor running speed according to actual operation conditions, to achieve energy saving effect.

AC drive parts name introduction


AC drive mounting space requirements

AC drive system

1) Make isolation switch active between power source and AC drive to assure personal safety in repairing and maintenance.
2) Install breaker or fuse in power supply loop with over current protection function to avoid malfunction cause AC drive failures and damaged.
3) AC input reactor: If the high harmonics generated between AC drive and power supply can't reach system requirement or need to improve the drives input power factor, AC input reactor is needed.
4) Magnetic control conductor is only applied to power supply control but not applied to control the AC drive on/off.
5) Input EMI filter can inhibit high-frequency conduction disturbance of the AC drive power supply wires.
6) DC reactor: To avoid the AC drive affected from power supply and inhibit high harmonic.
7) Output EMI filter can use inhibit emission disturbance noise and wire leakage current from output side.
8) AC output reactor to avoid motor insulation damage, big over current and AC drive frequent protection when wires length exceeds 50meters from the AC drive to the motor.
9) AC drive and motor must be earthed well and grounding resistor value smaller than 10Ω. Earth wire is the shorter the better, and wire diameter is the bigger the better.

AC drive wiring

AC drive keypad
Keypad is the AC drive main unit to receive command and display parameters.