75 hp (55 kW) VFD, 3 Phase 230V, 440V, 480V

75 hp (55 kW) VFD with low cost, three phase 230V, 440V, 480V variable frequency drive with good performance, RS485 available, brand new direct sale by manufacturer.
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Delivery date: 6 - 12 days

75 hp (55 kW) heavy duty variable frequency drive for energy savings, three phase 230V, 440V, 480V for selection.


Basics Model GK3000-4T0550G
Capacity 75 hp (55 kW)
Shipping weight 40 kg
Dimension 560*320*269 mm
I/O Feature Rated current 112 A
Input voltage 3 phase 230V /440V /480V AC ±15% (Optional)
Input frequency 50Hz/ 60Hz
Output voltage 3 phase AC 0~input voltage
Output frequency 0.00~400.00Hz
Over load capacity 150% of rated current for 1 minute, 180% of rated current for 3 seconds
Control Feature Control mode V/F control;
Sensorless vector control;
Communication RS485
Speed regulation 1:100
Start torque 150% of rating torque at 1 Hz
Speed control accuracy ≤±0.5% of rating synchronous speed
Frequency precision Digital setting: max frequency x± 0.01%;
Analog setting: max frequency x± 0.2%
Frequency resolution Analog setting: 0.1% of max frequency;
Digital setting: 0.01Hz
Torque boost Automatic torque boost, manual torque boost 0.1%~30.0%
Interior PID controller Be convenient to make closed-loop system
Automatic energy save running Optimize V/F curve automatically based on the load to realize power save running
Automatic voltage regulation (AVR) Can keep constant output voltage when power source voltage varies.
Automatic current limiting Limit running current automatically to avoid frequent over-current which will cause trip
Environment Enclosure rating IP 20
Temperature –10℃~ +40℃; VFD will be derated if ambient temperature exceed 40℃; each rise 1℃, the derate will be 5%
Humidity 5%-95%, without condensation
Altitude ≤1000m; VFD will be derated if above 1000m
Impingement and oscillation Normal running:<5.9m/s2 (0.6g); Transportation:<15m/s2 (1.5g)
Store environment –20℃~ +60℃; no dust, no corrosive gas, no direct sunlight


Tips: Variable Frequency Drive vs Soft Starter
Conventional soft starters control AC motor in soft starting by reduced voltage during starting period. But it also causes a significant reduction in starting torque which will prolong acceleration times. Reduction in mechanical stress is achieved at the expense of increase in electrical stresses. Variable frequency drive (VFD) applies V/Hz method for AC motor speed control to make the motor starting from zero speed to required speed “slowly” (can be set as short as 1s according to practical application demand), and maintain a constant torque in the starting period. Therefore, the VFD controls the motor accelerating smoother than soft starter with lesser electrical stresses. This is especially important in the applications where need high starting torques.

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PDF: GK3000 VFD User Manual
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