Frequency Inverters

RNB3000

Frequency converter for three-phase AC motor speed control using SVPWM control theory and IGBT power output devices, designed for fan, pump, and compressor applications with adjustable carrier frequency to minimize motor noise.

Power Range (G type)1.5–500 kW

Power Range (P type)2.2–500 kW

Input Voltage3-phase 380 Vac, 50/60 Hz

Output Frequency0–600 Hz

Control TypeOptimized Space Vector SPWM

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Product Details

OVERVIEW

The RNB3000 Series is a frequency converter for three-phase AC motor speed control, employing microprocessor technology, SVPWM control theory, and IGBT power output devices for high reliability.

Designed with adjustable carrier frequency to minimize motor noise, the RNB3000 targets applications operating outside high-efficiency zones — including fan, air compressor, and pump systems with large pressure/flow variation and extended run times. It is available in G type (heavy load, 150% overload) and P type (light load, 120% overload) configurations.

RNB3000

Space Vector Technology

Excellent vector algorithm guarantees big torque at low frequency with minimal switching loss.

Dead-Zone Compensation

Unique software method addressing low-frequency pulsating torque for smooth motor operation.

Speed Tracking Self-Start

Automatically recognizes motor speed and starts the running motor without requiring a sensor.

Auto Energy Saving

Software power factor regulation dynamically adjusted by load to minimize energy consumption.

Voltage Fluctuation Control

Output voltage vibration is within ±5% when input voltage vibration is within ±20%, ensuring stable motor performance.

Comprehensive Protection

Overvoltage, overcurrent, undervoltage, IGBT short-circuit, and inverse time limit overload protection built in.

PWM Braking

Built-in flexible energy consumption braking; user selects an appropriate braking resistor for their application.

HMI with LCD Display

LCD Chinese/English display with 8 digital inputs, 2 analog inputs, 3 digital outputs, and 2 analog outputs.

Intelligent Temperature Detection

Monitors heat sink temperature to protect the inverter and connected equipment from thermal damage.

Fan Management

Cooling fan start/stop is controlled by the run command or a user-set temperature threshold for extended fan life.

SPECIFICATIONS

INPUT

4 SPECS

01Power Supply

3-phase 380 Vac, 50/60 Hz

02Input Voltage Range

±20%

03Voltage Imbalance Ratio

<3%

04Frequency Range

±5%

OUTPUT

10 SPECS

01Motor Capacity (Constant Torque — G type)

1.5–500 kW

02Motor Capacity (Variable Torque — P type)

2.2–500 kW

03Rated Output

3-phase 380 Vac, 50/60 Hz

04Frequency Range

0–600 Hz

05Setting Resolution — Analog

0.4% of maximum set frequency

06Setting Resolution — Digital

0.01 Hz (below 100 Hz); 0.1 Hz (above 100 Hz)

07Frequency Precision — Analog

±0.2% (25 ± 10 °C)

08Frequency Precision — Digital

±0.01% (−10 to +50 °C)

09Overcurrent Withstand — G Type

150% rated output current for 1 min

10Overcurrent Withstand — P Type

120% rated output current for 1 min

CONTROL

15 SPECS

01Control Type

Optimized Space Vector SPWM

02Torque Compensation

Auto torque boost at start; up to 150%

03Slip Compensation

Speed-drop correction under load

04Instant Power Failure Restart

Yes — restarts upon power recovery

05Upper/Lower Frequency Limit

Settable

06Skip Frequency

3 groups

07Speed Tracking Restart

Seamless transition to inverter control without stopping motor

08Accel/Decel Curve Types

Linear, S1, S2

09Operation Modes

Keyboard; keyboard control; communication (RS485); digital input; analog input

10Stop Modes

Free stop; deceleration stop; deceleration with DC braking

11Carrier Frequency

1 kHz to 6 kHz (adjustable)

12PID Closed-Loop Control

Flow, pressure, temperature applications

13Frequency Setting Methods

Keypad (▲/▼); 0–10 VDC analog; 0–20 mA / 4–20 mA current; multi-step (1–7 speeds)

14Running Status Output — Relay

Run status, fault status, monitoring status

15Running Status Output — Analog

Frequency, current, voltage, speed (selectable)

PROTECTION

10 SPECS

01Overload

Output load current monitoring

02Overvoltage

DC bus overvoltage monitoring

03Surge Voltage

Line-to-line or line-to-ground surge events

04Undervoltage

DC bus drops below threshold

05Overheat

Heat sink temperature monitoring

06Short-Circuit

Output side short-circuit or overcurrent

07Ground Short-Circuit

Output-side ground fault

08Motor Overheat

Electronic relay overload protection

09Overcurrent

100–150% (adjustable)

10Grounding

U/V/W relative short-circuit → inverter stop

ENVIRONMENT & INSTALLATION

6 SPECS

01Installation Site

Indoor; altitude <1,000 m; no corrosive/flammable gas, dust, oil mist, or water drops; no direct sunlight; no strong magnetic fields

02Operating Temperature

−10 °C to +40 °C

03Humidity

5–95% RH (no condensation)

04Vibration

≤ 0.5 g

05Storage Temperature

−25 °C to +60 °C

06Installation Method

Wall mounting standard; 400–500 kW models may use bottom rack

Use Cases

APPLICATIONS

Engineered for demanding environments across multiple industries and operating conditions.

01Fans

02Air Compressors

03Pumps

04Belt Conveyors

05Ball Mills and Rolling Machines

06Variable Flow Systems

REQUEST A QUOTE

Contact Athena Control for pricing, availability, and technical support for the RNB3000.