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RNB3000 Series Frequency Inverter

Product Description

RNB3000 series frequency converter is a frequency converter used to control the speed of three-phase AC motors. The product adopts modern microprocessor technology and SVPWM control theory technology, and adopts insulated gate bipolar crystal Youku tube IGBT with modern advanced technology level as power output device . Therefore, it has high operating reliability, and the adjustable carrier frequency greatly reduces the noise of the motor. The perfect protection function of this product provides good protection for the inverter and the motor.

The scope of products:

○ Suitable for systems where the operating conditions of fans, air compressors, and pumps deviate from the high-efficiency zone;

○ Suitable for systems with large pressure and flow changes and long running time;

○ Applicable to systems that use wind deflectors, valve interception and bypass flow to adjust flow;

○ Fans, air compressors, pump loads with medium and low flow changes, and fans with full flow gaps.

Technical Characteristics:

○ Newest space vector technology

Excellent vector algorithm guarantees the big torque for low frequency in premise of lowest switch loss. High efficiency power voltage availability and optimized sine wave output will reduce its working noise and heat of motor.

○ Unique software dead-zone compensation

The dead-time is the main reason for the low frequency pulsating torque of the inverter. The unique software dead-time compensation of RNB3000 can ensure the stable torque characteristics under the conditions of low frequency and extreme speed to the greatest extent.

○ Excellent speed tracking self-starting without speed sensor

Start the running motor to guarantee the user's equipment to keep stable running RNB3000 can automatically recognize the speed to realize stable speed tracking.

utomatic energy saving runningUniq

ue software power factor regulation which will regulate the power factor dynamically according to the change of load so as to save much energy.

○ Voltage fluctuation control

Automatic voltage control could guarantee the output voltage vibration is within ±5% when the input voltage vibration is within ±20%

○ Complete protection function

Overvoltage, overcurrent, undervoltage, IGBT short-circuit, inverse time limit overload protecting design. And it also requests necessary grounding to realize safe protection.

○ Built-in flexible PWM energy consumption braking

The user selects the suitable braking resistor to realize energy consumption braking conveniently.

○ Friendly HMI and flexible input&output interface port

LCD Chinese-English display, supply 8 routines digital input, 2 routines analog input.3 routines digital output, 2 routines analog output and multi-speed programmable running.Potential meter setting mode.

○ Intelligent temperature detection

○ Intelligent fan management

① Control the start and stop of the fan according to the inverter running/stop command;

②The user can set the temperature to control the start and stop of the fan.

Technical index::


Power supply: 3 phase 380Vac 50/60Hz

Input voltage range: Voltage: ±20%, Voltage imbalance ratio: <3%: Frequency: ±5%


● Applicable motor capacity: 1.5~500kW(Constant torque application); 2.2~500kW(Torque change applications)

● Applicable motor capacity: 4.1~972kW(Constant torque application); 5.6~972kW(Torque change applications)

● Rated current output: 3 phase 380Vac 50/60Hz

● Frequency range: 0-600Hz

● Setting resolution: Analog setting: 0.4% of the maximum setting frequency; Diaital settina: 0.01Hz ( below 100Hz): 0.1Hz (above 100Hz)

● Frequency precision: Analog setting: ±0.2% (25±10℃); Digital setting: ±0.01% (-10~+50℃)

● Over current withstand capacity: G type: 150% rated output current for 1 Min; P type: 120% rated output current for 1 Min.


● Control type: Optimized space vector SPWM

● Torque compensation: Automatic torque arising for starting, which will reach 150%

● Slip compensation: Compensate the speed drop when driving the load in order to enhance the mechanical characteristic hardness

● Restarting when instant power supply failure: It will restart for the power recovery undergoing instant power supply failure

● Upper and lower frequency: Set the upper frequency and lower frequency

● Skip frequency: Set 3 groups of skip frequency3

● Speed tracking restarting: No need to stop the running motor but it could interchange to run under continual running operated by frequency inverter.

● Acceleration and deceleration integral type: The available linear line, S1 and S2 curve, which will satisfy multi-purpose demand.

● Running operation mode: Keyboard operation; keyboard control; communication operation;diaital input operation and analoa input control; Serial communication: controlled by upper machine through the RS485 port

● Stop mode: Free stop, deceleration stop and deceleration with DC braking stop

● Low noise running control: Adjust the frequency from 1KHz to 6KHz to reduce the running noise.

● PID closed-loopcontrol: It is available application for different closed-loop control system such as flow, pressure, temperature

● Frequency setting: Keyboard setting: use ▲ and ▼ key to set; Analog input signal setting(potential setting): with 0~10VDC voltage signal; 0-20mA, 4-20mA current signal setting; Multi-step frequency selection setting: Configurated by the digital input to select the 1~7 running frequency.

● Running status output signal: Relay output: running status, fault status and monitoring status are available; Analogue output: available to select related parameters like frequency, current, voltage, speed and so on.


● Running/stop: Display frequency, current and so on.

● Setting mode: Display the setted menu No. or setted parameter value

● Function operation mode: Display the operating function information and warning information.

● Alarm and fault mode: Display all the alarms and fault codes


● Overload protection: Monitor the output load current of frequency inverter to protect the frequency inverter.

● Overvoltage protection: Monitor the overvoltage of DC bus to protect the frequency inverter.

● Surge voltage protection: When power line-to-line or line-to-grounding exists the surge voltage, this function will protect the frequency inverter

● Under voltage protection: Monitor the DC bus voltage, when the voltage is lower than the setting level of n608, this protection will protect the frequency inverter.

● Overheat protection: Monitor the temperature arising of the heat sink. Once the temperature exceeds the setting, this function will protect the frequency inverter.

● Short-circuit protection: Short-circuit or overcurrent of frequency output side, this protection will protect frequency inverter.

● Short-circuit to grounding protection: When Short-circuit to grounding happens on output side of frequency inverter, this function will protect frequency inverter.

● Motor overheat protection: The frequency inverter will use electronic relay to carry out the motor overload protection.

● Over current protection: 100-150% (Adjustable)

● Grounding protection: U, V, W relative short circuit, inverter stop.


● Application site: Indoor, the altitude is less than 1000m. It requests no corrosive gas, no flammable gas, no dust, no oil mist, no water drop. Prohibit direct sunshine without strong magnetic field interference.

● Application temperature: -10℃~40℃

● Application of humidity: 5~95%RH (No frost)

● Vibration: ≤0.5g

● Storage temperature: -25℃~60℃

Product Model

Model Explanation:


P Type: Light load type, the overload ability is 120%,such as Fan, pump.
G Type: Heavy load type, the overload ability is 150%.such as ball mill, rolling machine and belt machine.
Submersible pumps and Roots blowers are heavy-duty, so type G should be selected;
The ball mill, steel rolling mill, and extruder should be scaled up one more step on the basis of G type.

Detailed specification

Size of outline and installation

Remarks: Installation mode for all the above types is wall mounting. Type 400-500kw could choose bottom rack.


Related solutions

Product application cases