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    7.5 hp (5.5 kW) VFD, Single Phase Input & Output

    4.9 out of 5 based on 15 reviews | Write a review
    Favorable price 7.5 hp VFD, 1 phase for single phase AC induction motor, high variable speed performance, 220V - 240V 32 amps, manufacturer direct sale.
    SKU: GK3000-1S0055
    Availability: In stock
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    Delivery date: 2-3 days

    7.5 hp variable frequency drive, 5.5 kW, 1 phase 220V - 240V for single phase AC motor, manufacturer direct sale.


    Basics Model GK3000-1S0055
    Capacity 7.5 hp (5.5 kW)
    Shipping weight 9 kg
    Dimension 330*200*200 mm
    I/O Feature Rated current 32 A
    Input voltage single phase AC 220V±15%
    Input frequency 47~63Hz
    Output voltage 0~rated input voltage
    Output frequency 0~1000Hz
    Over load capacity 150% of rated current for 60s, 180% of rated current for 10s, 200% of rated current for 3s
    Control Features Control mode V/F, Sensorless vector control (SVC), Speed sensor vector control (FVC)
    Operation command mode Keypad control, Terminal control, Serial communication control
    Frequency setting mode Digital setting, analog setting, pulse frequency setting, serial communication setting, multi-step speed setting & simple PLC, PID setting, etc. These frequency settings can be combined & switched in various modes.
    Start frequency 0.40Hz~20.00Hz
    Speed adjustment range 1:50
    Carrier frequency 1.0-16.0kHz, automatically adjusted according to temperature and load characteristics
    Frequency accuracy Digital setting: 0.01Hz
    Analog setting: Maximum frequency * 0.05%
    Torque boost Automatically torque boost; manually torque boost: 0.1%~30.0%
    V/f curve Three types: linear, multiple point and square type (1.2 power, 1.4 power, 1.6 power, 1.8 power, square)
    Acceleration/deceleration mode Straight line/S curve; four kinds of acceleration/deceleration time, range: 0.1s~3600.0s
    DC braking DC braking when starting and stopping
    DC braking frequency: 0.0Hz~maximum frequency, braking time: 0.0s~100.0s
    Jog operation Jog operation frequency: 0.0Hz~maximum frequency
    Jog acceleration/deceleration time: 0.1s~3600.0s
    Simple PLC & multi-step speed operation It can realize a maximum of 16 segments speed running via the built-in PLC or control terminal.
    Built-in PID Built-in PID control to easily realize the close loop control of the process parameters (such as pressure, temperature, flow, etc.)
    Automatic voltage regulation Keep output voltage constant automatically when input voltage fluctuating
    Control Function Common DC bus Common DC bus for several VFDs, energy balanced automatically
    Torque control Torque control without PG
    Torque limit "Rooter" characteristics, limit the torque automatically and prevent frequent over-current tripping during the running process
    Wobble frequency control Multiple triangular-wave frequency control, special for textile
    Timing/length/counting control Timing/length/counting control function
    Over-voltage & over-current stall control Limit current & voltage automatically during the running process, prevent frequent over-current & over-voltage tripping
    Fault protection function Up to 30 fault protections including over-current, over-voltage, under-voltage, overheating, default phase, overload, shortcut, etc., can record the detailed running status during failure & has fault automatic reset function
    Input/output terminals Input terminals Programmable DI: 7 on-off inputs, 1 high-speed pulse input 2 programmable AI:
    AI1: 0~10V or 0/4~20mA
    A12: 0~10V or 0/4~20mA
    Output terminals 1 programmable open collector output: 1 analog output (open collector output or high-speed pulse output)
    2 relay output
    2 analog output: 0/4~20mA or 0~10V
    Communication terminals Offer RS485 communication interface, support MODBUS-RTU communication protocol
    Human machine interface LED display Display frequency setting, output frequency, output voltage, output current, etc.
    Multifunction key QUICK/JOG key, can be used as multifunction key
    Environment Ambient temperature -10℃~40℃, derated 4% when the temperature rise by every 1℃ (40℃~50℃).
    Humidity 90%RH or less (non-condensing)
    Altitude ≤1000M: Output rated power, >1000M: Output derated
    Storage temperature -20℃~60℃

    Note: The single phase motor should Not be adjusted to run based on a lower frequency than 80% of its rated frequency for along time, otherwise the motor may fail.
    Tips: Variable frequency drive functions in air conditioning

    1. In air conditioning, VFD can make the compressor motor speed continuously adjustable, and the speed is based on indoor air conditioning load proportional change. When the room needs rapid cooling (or rapid warming), air conditioning load will increase, the compressor speed up, and the cooling (or heating) capacity will proportion increases. And then after reaches the set temperature, the system will operate in low-speed to maintain room temperature.
    2. VFD air conditioner uses electronic expansion valve to control the flow, and its outdoor micro processor controls the valve opening degree based on the expansion valve inlet and outlet, the compressor in the air pipe at the temperature sensor to collect information, which can change the flow of refrigerant at any time. The speed of the compressor corresponds to the opening degree of the expansion valve, so that the capacity of the evaporator can be maximized. At the same time, because of using electronic expansion valve as a throttle element, the device will not stop when defrost. It uses compressor exhaust heat to the indoor, and then sends the remaining heat to the outside to melt the frost on heat exchanger fin.
    3. VFD air conditioner will gradually replace the traditional fixed speed air conditioner, and becoming the main stream of air conditioning control technology. The frequency conversion technology has been changed from AC type to DC type, and the control technology has been developed from PWM (Pulse Width Modulation) to PAM (Pulse Amplitude Modulation). The speed of the compressor with PWM control is limited by the upper limit speed, generally not more than 7,000/min, and the compression speed of PAM control mode can be increased for about 1.5 times, which greatly improves the refrigeration capacity at refrigeration and low temperature.

    Running a single phase motor with VFD

    In this video, ATO will show you details about running a single phase motor on a VFD. It's important to note that there are two wiring methods for single phase motor connecting to ATO single phase VFD: wiring of removing motor capacitor & wiring of keeping motor capacitor. At first, you should choose the wiring method you needed, and then set basic parameters step by step.

    Existing reviews of 7.5 hp (5.5 kW) VFD, Single Phase Input & Output
    Can I adjust the frequency it operates at while running?
    Sorry for the confusion. My frequency range is 40 to 60 Hz. When I power up the VFD, the display flashes 40Hz. Can I adjust the frequency it operates at while running?
    From: Ivy01 | Date: 09/10/2023
    Was this review helpful? Yes No (0/0)
    ATO Responded
    Yes, when the VFD is running, you can adjust the frequency through the operation panel potentiometer, set P0.01=0 (the frequency comes from the keyboard analog potentiometer). Let us know if you have any other questions.
    Can I use a phased sine wave filter (partially) in a single phase output?
    We purchased three 7.5 hp (5.5 kW) VFD's from your company and we would like to filter their outputs as we have noticed that they stress the compressor start capacitors, one of which has failed. Is it possible to use a phase sine wave filter (partially) in the single phase output? Or do you know of any manufacturer that offers this solution?
    From: lily | Date: 04/09/2023
    Was this review helpful? Yes No (0/0)
    ATO Responded
    Unfortunately, three-phase filters cannot be used as single-phase filters. We recommend that you replace the compressor's start capacitor with a model with higher withstanding voltage and better performance.
    How do I set the starting frequency?
    My frequency range is from 40 to 60 and it starts at 40Hz.
    How do I set the starting frequency?
    From: vickey | Date: 04/09/2023
    Was this review helpful? Yes No (0/0)
    ATO Responded
    If you want a 0-60HZ output, you can set the lowest frequency to P0.20=0 (lower frequency limit).
    Is there any way to go through the VFD parameters over the phone?
    OK, this drive is running a single-phase 240 V motor with the capacity of no pressure transducer.
    I have set all parameters but when I push the start button, the motor does not turn and just hums.
    I am also trying to use a 2-wire control to start and stop the motor with a time block. Is there any way to go through the parameters over the phone?
    From: doro | Date: 17/07/2023
    Was this review helpful? Yes No (0/0)
    ATO Responded
    1. Please provide us with your motor nameplate picture.
    2. What parameters did you set? Please provide the wiring diagram.
    3. It would be better if the working video of VFD can be provided.
    Thank you for your understanding. You can send us the large video file via
    I need your help to solve VFD problem
    I am having problems programing a 220v 5.5kw single phase drive is there any way that I can contact you for help.
    From: duran | Date: 16/06/2023
    Was this review helpful? Yes No (0/0)
    ATO Responded
    Please describe what programming problem you are having.
    And provide us your motor nameplate drawing for further confirmation.
    You can refer to our setup manual and video.
    What is the best way to wire the auxiliary contacts to start this VFD?
    What is the best way to wire the auxiliary contacts to start this drive with a time clock and what would I need to change in the programing?
    Thank you.
    From: luna | Date: 10/05/2023
    Was this review helpful? Yes No (0/0)
    ATO Responded
    You want to control the start of the VFD through the contacts of a timing relay, yes?
    Please tell us in detail what is your control requirement?
    You can refer to our demo video for inspiration. Please see on:
    Overheated the compressor
    We have successfully tested this VFD with our air-conditioning compressor (model: Copeland ZR48K3E-PFJ-522 / Locked motor current: 114 A / max. operating current: 23.5 A, starting capacitor: 60 uF). However, the only configuration which really works is a two-terminal connection with the starting capacitor present. Unfortunately, all other 3-wire configurations, which directly supply the secondary winding as presented in the manual, resulted in very high currents, which immediately overheated the compressor. The running current, as shown on the VFD screen, is about 9.2 A in normal operation, but was exceeding 25 A when connected in a 3-wire configuration. Could you please explain this problem? When trying to supply the VFD directly from the available 330 V DC bus, the inrush current is extremely high, immediately blowing a slow-blow 30 A fuse. Could you please provide the exact total capacity of the internal capacitors of the VFD? We need to either install a bigger fuse or, better, provide a slow-start for charging the internal capacitors of the VFD without blowing the fuse.
    From: Keran | Date: 04/04/2023
    Was this review helpful? Yes No (0/0)
    ATO Responded
    1. Because 3-wire configurations change the internal structure of the motor, the starting current of the motor will be very large. Not all single-phase motors are suitable for changing to 3-wire configurations, so we recommend that you continue to use 2-wire configurations and keep the capacitor connection.
    2. The fuse can be configured according to 1.5 times the rated current of the VFD, and you can use a 50A fuse for testing.
    I want to add VFD’s to our two 10hp irrigation pump motors.
    I want to add VFD’s to our two 10hp irrigation pump motors. So we can set the ramp rate and reduce water hammering.

    I was told that you can’t get VFD’s for single phase motors over 5 hp but then came across yours.

    I have attached the name plate from one of the motors (they’re both the same).
    From: Mervyn | Date: 03/03/2023
    Was this review helpful? Yes No (0/0)
    ATO Responded
    Our largest single-phase VFD is only 7.5kw, and the output rated current is 50A. But your single-phase motor is also 7.5kw, with a current of 41A. In this case, we can Not guarantee that our single-phase VFD can normally drive this 7.5kW single-phase motor.
    What VFD setting should adjust?
    I am currently trying to program my gk3000 VFD to operate my 7.5 hp motors.
    I have 240V single phase from two inverters. I have 195V per wire on the output.
    I am wanting 115V per wire on the out put. What setting should I adjust to achieve my goal?
    From: paddy | Date: 01/03/2023
    Was this review helpful? Yes No (0/0)
    ATO Responded
    You can set parameter p0.08 (maximum output voltage).
    VFD problem.
    I have installed a GK3000 single phase VFD, a 3 phase motor is connected. The VFD boots up and there are no alarms. When I run the VFD the display shows the output frequency and output voltage but the motor does not turn and there is no voltage outputting to the motor.
    From: Danie | Date: 25/05/2022
    Was this review helpful? Yes No (0/0)
    ATO Responded
    1. Please provide us with a video to show the problem you describe. The video should show that the VFD is running, but there is no output voltage.
    2. You can set the VFD parameters: P3.01=10 (restore the factory parameters), run the VFD with no load, and when the frequency runs to 50/60HZ, use a multimeter to measure whether the output terminals U-V and V-W of the VFD have output voltage.
    We are looking for a VFD. Can you give us some advice?
    We are looking for single phase input and output VSD for single Phase fan 230VAC, 0.4kW. Could you please give me advice?
    From: Terepocki | Date: 24/01/2022
    Was this review helpful? Yes No (0/0)
    ATO Responded
    Yes, recommended drive model: GK3000-1S0007, 1 hp (0.75 kW) power capacity.
    The use effect of VFD
    I've been in the electrical business for a long time and I'm very pleased to see your single phase output VFD. How can the starting torque be compared when using the drive VS the same motor starting with its original capacitors? Taking this to a bad case like starting a piston compressor, would it work?
    From: Randrsn | Date: 31/08/2021
    Was this review helpful? Yes No (0/0)
    ATO Responded
    If you use our single phase output VFD, the starting torque of the single phase motor will be smaller than the original motor. Because the starting voltage and frequency will be smaller when the VFD just starts the motor. So for such a piston compressor to start, it would not work.
    How to choose a VFD?
    I have a 3 hp 115 volt 30 amp motor that I need a VFD for. What are my options for this application?
    From: Sneaky | Date: 09/05/2021
    Was this review helpful? Yes No (0/0)
    ATO Responded
    We provide 1 phase drive, but only for 1 phase, 220/230/240V motors. Don't provide for 115V motors.
    7.5 hp single phase VFD drive
    I want to purchase your 7.5 hp 1 phase VFD, but my motor has 2 starting capacitor and 1 running capacitor? Does that work?
    From: Wilson | Date: 28/04/2021
    Was this review helpful? Yes No (0/0)
    ATO Responded
    Yes, it does not matter, your can remove capacitors or keeping them, the drive will run the motor effciently.
    7.5hp (5.5kW) VFD connection problem
    When connecting a 1-phase VFD to a 1-phase motor, can I remove the start/run capacitor?
    From: Mahem | Date: 25/03/2021
    Was this review helpful? Yes No (0/0)
    ATO Responded
    No, you can keep the capacitor.
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