Frequency Inverter (Open Loop Small Size Inverter)

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Product Description

Designed for low power applications, KE300X frequency inverter is essentially a small size open loop inverter built on KE300 technology.

The phrase open loop is rather a misleading term since all vector control frequency converters are in fact closed loop systems, which means feedback information is available in all of them. The only difference is that the so-called open loop small VFD does not use a sensor or shaft encoder to get operational data feedbacks. That is why this frequency inverter is sometimes called the sensorless variable frequency drive.

Frequency Inverter (Open Loop Small Size Inverter)

Built in a smaller than usual size, this AC drive can fit in a very small space as long as there are effective heat dissipation measures in place. Common traits found in this variable speed drive or VSD are high control accuracy, quick response to sudden changes in load torques and optimized protections. The power of our frequency inverter can be 0.4 kW, 0.75 kW, or 1.5kW. Its input voltage is single phase 220V±15%.

Model Selection

Model	Matched Motor		Rated Input Current (A)	Rated Output Current (A)
Model	kW	HP	Rated Input Current (A)	Rated Output Current (A)
KE300X-0R4G-S2	0.4	0.5	5.4	2.3
KE300X-0R7G-S2	0.75	1	8.2	4
KE300X-1R5G-S2	1.5	2	14	7

Overall Dimensions and Installation Dimensions

Specifications of KE300X Frequency Inverter

KE300X Portable Frequency Inverter
Input	Input Voltage	1AC , 220V±15%
Input	Input Frequency	47~63Hz
Output	Output Voltage	3AC , 0 ~ input voltage
Output	Output Frequency	V/f: 0~3000Hz, SVC: 0~300Hz
ControlFeature	Control Mode	V/f , SVC, Torque control
	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.
	Overload Capacity	150% 60s, 180% 10s, 200% 3s
	Starting Torque	0.5Hz/150% (SVC), 1Hz/150% (V/f)
	Speed Adjustment Range	1:100 (SVC), 1:50(V/f)
	Speed Control Precision	±0.5% (SVC)
	Carrier Frequency	1.0-16.0kHz, automatically adjusted according to temperature and load characteristics
	Frequency Accuracy	Digital setting: 0.01HzAnalog setting: maximum frequency ×0.05%
	Torque Boost	Automatically torque boost; manually torque boost 0.1%~30.0%
	V/f Curve	Three types: straight line, multiple point and square type (1.2 power, 1.4 power, 1.6 power, 1.8 power, square)
	ACC/DEC Mode	Linear/S curve; four kinds of ACC/DEC time, range 0.1s~3600.0s
	DC Braking	DC braking when starting and stoppingDC braking frequency: 0.0Hz~maximum frequency, braking time: 0.0s~36.0s; Braking current: 0.0%~100.0%
	Jog Operation	Jog operation frequency: 0.0Hz~maximum frequencyJog ACC/DEC time: 0.1s~3600.0s
	Simple PLC & Multi-StepSpeed Operation	Max. 16 steps speed running via built-in PLC or control terminal.
	Built-in Dual PID	Built-in PID control easily realizes the close loop control of the process parameters (such as pressure, temperature, flow, etc.)
	Automatic Voltage Regulation	Keeps output voltage constant automatically when input voltage fluctuates
I/O terminals	Input Terminals	Programmable DI: 7 on-off inputs, 1 high-speed pulse input 2 programmable AI: AI1: voltage -10 ~10VA12: voltage 0 ~10V or current 0/4 ~20mA
	Output Terminals	1 programmable open collector output: 1 analog output (open collector output or high-speed pulse output)2 relay outputs2 analog output: 0/4~20mA or 0~10V
	Communication Terminal×2	Offer RS485 communication interface, support MODBUS-RTU communication protocol

Applications of KE300X Frequency Inverter

This small-size frequency inverter is widely used in many occasions such as draught fans, water pumps, textile machinery, CNC machines, flow production lines and assorted mechanization.

Various Draught Fans and Water Pumps
Washing Industry
Machine Tool Equipment

Woodworking Equipment
Simple Cranes and Lifting Appliances
Air Compressor, Centrifugal Machine, Ceramic Machinery, etc
Other Low-End Application Occasions

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