Description

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

Specification:

Basics	Model	GK3000-4T0550G/ GK3000-2T0550G
Capacity	75 hp (55 kW)
Shipping weight	31 kg
Dimension	555310260 mm for GK3000-4T0550G/ 650400300 for GK3000-2T0550G
I/O Feature	Rated current	110A at 380V ~ 480V, 210A at 220V ~ 240V
Input voltage	3 phase 230V /440V /480V AC ±15% (Optional)
Input frequency	50Hz/ 60Hz
Output voltage	3 phase AC 0~input voltage
Output frequency	0Hz~1000Hz
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

Note: ATO VFD Cannot be used as a power source, it Can only be directly connected to an induction motor to control the motor speed.

Tips: Variable Frequency Drive Overload
Overload is also one of the frequent failures of VFD. When meet with the problem, we should first analyze if the motor overloads or VFD itself overloads. Generally speaking, the motor has high overload capacity, as long as the VFD parameter is set properly, it will not appear motor overload. But the VFD overload capacity is relatively not high. It is easy to appear overload alarm. We can detect the VFD output voltage, output current, and detect circuit and other trouble points one by one for trouble shooting.
For example, a 75hp VFD often displays “OL” when running.
Analysis and maintenance: According to the response from customer, this VFD was originally used in the 50hp motor, but now it is used for 75hp motor without resetting any parameters, so the problem may be out on the parameters. After checking, set VFD limit current as 75hp motor rated current instead of 50hp, and finally the problem is solved.