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Gozuk: a reliable supplier in China of variable frequency drive inverters, soft starters, input/output filters and related accessories for AC motor control applications.

AC drives - Industrial Motor Variable Speed Controls

AC drivesGozuk 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. Gozuk 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 drives are suitable for paper industry, constant water pressure supply, metallurgy and other high control precise requirement industries.

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

Gozuk AC drive general specifications
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
Output voltage range
0 - rated input voltage, three phase
Output frequency range
Control features
Control mode
EDS800 series: optimal space voltage vector SVPWM constant voltage frequency ratio V/F control;
EDS1000 series: Speed sensorless slip vector control, open loop V/F control;
EDS2000 series: optimal space voltage vector PWM control;
EDS2800 series: simple current vector control special for injection molding machine.
Over loading capacity
G type: 150% of rated current for 1 minute,200% of rated current for 0.5s;
P type: 120% of rated current for 1 minute (for type of 3.7kw~132kw); 110% of rated current for 1 minute, 150% of rated current for 1 second (for type of above 160kw)
G2800 series: 150% of rated current for 3 minutes, 200% of rated current for 5 seconds
Speed regulation range
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: EDS800/1000 series: 0.5% of max. frequency; EDS2000 series: 0.1% of max
Digital keyboard settings: 0.01Hz
Start torque
100% of rating torque at low frequency for EDS800 series;
150% of rating torque at 1 Hz for EDS1000 series;
150% of rating torque at 3 Hz for EDS2000 series;
130% of rating torque at 1 Hz for EDS2800 series.
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. EDS1000 series AC drive has two models: straight line accelerating decelerating, and S curve accelerating Decelerating; 7 kinds of accelerating decelerating time (unit of minute/second can be optioned), max is 6000 minutes.
Power consumption brake: Interior or exterior braking resistance for EDS1000/2000; exterior braking resistance for EDS800 series (built-in braking unit)
DC brake: Optional start-up and stop, action frequency 0~15Hz, action volt. 0~15%, action time 0~20.0s
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 0~50KHz (for EDS1000/800 it is 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 (for EDS800 series: 1 channel of analog signal output AO, which can be 4~20mA or 0~10V), through them the variable frequency drive can realize output of physical parameter such as setting frequency, output frequency and etc.
Special channel of EDS2800
2-way 0-1A and 2-way 0-10V isolated analog input signal
LED display
Can display setting frequency, output frequency, output voltage, output current etc. in total 20 kinds of parameter (EDS800 has 14 kinds of parameter)
Button lock
Lock all of the buttons; For EDS1000/800: Lock all or part of the buttons(analog potentiometer can’t be locked)
Parameters copy
Parameters can be quickly copied. by using of keyboard and remote-control keypad(EDS800/1000 series haven’t this function)
Defending grade
Cooling mode
By fan with automatic temperature control
Environmental Constraint
–10℃ ~ +40℃; AC drive will be derated if ambient temperature exceeds 40℃; each rise 1℃, the derate will be 5%
5%-95%, without condensation
≤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 parts

AC drive mounting space requirements
ac drive mounting requirement

AC drive system

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 wiring

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

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