Product Overview

The medium voltage VSD is designed with the goals of ensuring high reliability, user-friendly operation, and excellent performance. It effectively meets the needs of users seeking energy-efficient speed control for applications such as fans, pumps, and compressors, thereby enhancing production processes.

To meet the needs of retrofit projects and minimize investment in new construction projects, as well as to shorten the construction period for the installation and retrofitting of medium-voltage variable frequency drive systems, an integrated design concept has been adopted.This includes transformer cabinets, power cabinets, control cabinets, medium-voltage switchgear (optional bypass cabinet), and all components and internal connections.Users only need to connect the medium-voltage input/output cables, low-voltage control power supply, and control signal lines.The RNHV series medium-voltage VSD system features integrated transportation and single-side maintenance, making on-site installation, maintenance, and commissioning convenient and user-friendly.

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The unit's DC support capacitor uses a metallized film capacitor and an internal mechanical bypass module. Compared with electrolytic capacitors, it offers higher reliability, maintenance-free operation, and a longer lifespan. The system also features enhanced protection and control functions, providing better environmental adaptability and meeting the process speed control requirements under various operating conditions.

Product Features

RNHV1000 series Medium voltage VSD

Output Power: Maximum output of 10kV/2500kW and 6kV/1500kW.
Integrated Structure: Overall dimensions reduced by 40%, allowing integral transportation and single-sided maintenance.
Quick Connectors: Reduces maintenance time for power units by 50%, providing a streamlined and efficient process.
Film Capacitors: Expected service life of up to 10 years, ensuring safety, reliability, and excellent performance.
Unit Thermal Protection: Real-time temperature monitoring provides sensitive and reliable protection.
Human-Machine Interaction Window: True-color touchscreen for easy operation and a clear display of equipment information.
5G+ Industrial Cloud: Cloud-based intelligent platform enabling remote and efficient technical support.

Model Description

The components of the RNHV1000 Series

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Power Unit Cabinet

Innovative modular drawer cabinet structure

Innovative Modular Drawer Cabinet Structure

The new cabinet design features a modular drawer structure that allows for quick plug-and-play connections, making installation and maintenance convenient. It combines innovative aesthetics with a lightweight and visually appealing design.

Power Unit

H-Bridge Topology and Modular Design

The system adopts an H-bridge topology with modular, interchangeable units. Its semi-sealed structure offers strong environmental adaptability and medium reliability. Integrated unit with bypass function internally.

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RNHV series Medium-Voltage Variable Speed Drive(VSD)

Control Cabinet

Revolutionary all-in-one controller

Our state-of-the-art integrated controller, combined with the PLC controller and standardized internal and external interfaces, optimizes the cabinet layout, simplifies on-site installation and operation, and ensures consistent equipment maintenance.

Excellent Human-Machine Interface

Monitoring Systems

> True-color touchscreen, easy to operate

> User-friendly interface with accessible operational data

> Virtual gauges for real-time display of key variable frequency drive parameters

> System status and power unit status monitoring

> Real-time and historical data display, trend analysis, and fault diagnostics

> Parameter setting and operation data recording

> User permission settings for equipment operation, debugging, and maintenance

> Multi-language support

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Control System

The control system is the core of the entire medium-voltage VSD speed control system. All functions are built upon a comprehensive control concept, and carefully designed algorithms ensure that the motor operates in its optimal state. The human-machine interface (HMI) provides a user-friendly, fully multilingual monitoring and operation interface, while also supporting remote monitoring and network-based control.

The control system consists of a controller, a human-machine interface (HMI), a programmable logic controller (PLC), and other components. The HMI serves as the communication window between the medium-voltage variable-frequency drive system and on-site users, offering convenience and efficiency. The controller implements PWM control algorithms, while the built-in PLC performs logical processing of switch signals within the cabinet, enabling flexible interaction with users to meet specific operational requirements.
The programmable logic controller (PLC) handles various switch-based logic signals, on-site control flow signals, and status signals. This gives the variable-frequency drive system strong interfacing and communication capabilities, which can also be expanded according to user requirements.
The control cabinet and power units are interconnected via fiber-optic communication technology, ensuring electrical isolation between the low-voltage and medium-voltage sections. This configuration provides high reliability, fast communication, and strong resistance to electromagnetic interference. The control cabinet is also equipped with an Uninterruptible Power Supply (UPS) to ensure a reliable power source for the control system.

System Wiring Diagram

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● Multi-machine Transmission

When two or more motors are used to drive a load jointly through mechanical coupling, it is essential to synchronize their speeds.However, even more critical is ensuring that each motor consistently produces power evenly and operates stably according to set standards. Even when each motor is driven by its own variable-frequency drive (VFD), the system can still ensure a uniform speed control sequence, with each motor correctly and appropriately sharing the torque of the mechanical load.

The master-slave control function of the variable-frequency drive can fulfill the above requirements. The VFD must operate in vector control mode. Any drive in the system can be designated as the master, while the remaining drives act as slaves. The master drive's speed control system issues torque control commands, which are received by the slave drives, temporarily disabling their own speed control loops. If the master drive's speed control system fails, one of the slave drives will be automatically promoted to the new master. In a multi-drive master-slave configuration, fiber-optic communication is used to transmit torque control commands.

● Convenient Maintenance

The cascaded multilevel topology at the unit level adopts a modular design, featuring a drawer-type cabinet structure with units connected to transformers through quick connectors.

The single-side maintenance design allows simple and efficient maintenance of inverter components, offering greater practicality and ease of use.

Product Technical Specifications

Name

Item

Specification

Input

1000 Series Power
Supply

3-phase 6kV/10kV, frequency: 50/60Hz

Input voltage range

Voltage: -10% to +10%; Frequency: ±2%

Output

1000 Series
Rated Voltage

3-phase 6kV/10kV, frequency: 50/60Hz

Frequency
modulation range

0 j 50/60Hz

Setting resolution

0.01 Hz

Overcurrent
capability

120% of rated output current for 1 minute every 10 minutes;
150% of rated output current for instantaneous protection.

Control

Control method

V/F control with PG vector control and without PG vector control.

Synchronous
switching

The frequency converter follows the voltage phase and frequency of the power grid, achieving a state
of grid connection and smooth switching from frequency converter to power frequency without impact

Torque
compensation

Automatic torque boost during startup to reach above 150%.

Slip compensation

Compensates for speed drop under load to enhance mechanical robustness.

Upper and lower
frequency limits

Upper and lower frequency limits can be set.

Skip frequency

Skip frequency can be set in 3 groups.

Name	Item	Specification
Control	Speed tracking during restart	The inverter can automatically search for the motor speed and smoothly restart operation when the motor is coasting due to power loss.
	Acceleration and deceleration time	Acceleration and deceleration time can be independently set from 0.1 to 3600 seconds.
	Acceleration and deceleration profile types	Linear or S-curve profiles can be selected to meet various application requirements.
	Operating modes	Local operation, on-site operation, remote operation.
	Stopping methods	Option to choose between coasting stop or deceleration stop.
	PID closed-loop control	Can be applied to various closed-loop control systems such as flow, pressure, temperature, and more.
	Neutral drift	By bypassing a power unit and using neutral drift technology, the three-phase output stays balanced. This guarantees maximum output power even after bypassing a unit. In case of a single-unit failure, the system can operate in bypass mode without impacting regular production operations.
	Automatic unit bypass	When a unit malfunctions, the inverter can automatically bypass the faulty unit and continue oper- ating using neutral drift technology without the need for manual intervention. If more than two units are bypassed, users simply need to operate at a reduced capacity as necessary.
	Power failure restart	In the event of an abnormal power outage, the inverter can automatically restart and restore to its pre-power loss state once the grid is restored within the set time, without the need for manual intervention.
	Frequency setting	Analog input signal setting: Configurable via a 4-20mA current signal. Multiple frequency segment selection settings.
	Fieldbus	ModbusđTcp/ipaPROFIBUS-DP
	Operating state output signal	Relay output: selectable to indicate operating states such as running, stopped, fault, etc. Analog output: selectable to indicate operating parameters such as frequency, current, voltage, speed, etc.
Display	During opera- tion/stop	Display frequency, current, voltage, etc.
	During setting	Display the set menu number or set parameter value
	During functional operation	Display active function information or prompts.
	During alarms, faults	Display various alarms and faults.
Protection	Overload protection	To monitor the output current of the inverter and protect the inverter in case of overload.

	Overvoltage protection	To detect the overvoltage of the DC busbar unit and protect the inverter in case of input overvolt- age.
	Surge voltage protection	To monitor surge voltages between input power lines and line-to-ground, protecting the inverter.
	Under-voltage protection	To monitor the input voltage and protect the inverter in case of under-voltage.
	Overheat protection	To monitor the temperature rise of the heat sink and protect the inverter when it exceeds the set value.
	Short-circuit protection	To monitor short circuits or overcurrent on the output side of the inverter, protecting the inverter.
	Motor overload protection	To monitor the motor for overload during operation and protect the motor.
	Open phase protection	To monitor the input voltage for phase loss and protect the inverter.
Environ- ment	Place of use	Indoors, at an altitude below 1000 meters, with no corrosive or flammable gases; free from dust, oil mist, water droplets, etc., preventing direct sunlight exposure, and without strong magnetic field interference. Altitudes above 1000 meters require derating for use.
	Operating temperature	-5¥j +40¥
	Operating humidity	5 j 95%RH (non-condensing)
	Vibration	≤0.5g
	Storage tempera- ture	-40¥j +70¥
	Ingress protection rating	IP30 (Please specify other protection ratings when ordering)

RNHV1000 Product Selection Table

Inverter model	Rated voltage (kV)	Rated current (A)	Motor power compatibility (kW)	Output capacity (kVA)	Dimensions (WDH mm) (including fan)	Weight (kg)
RNHV-A-10/220	10	16	220	280	180015002550	2200
RNHV-A-10/250	10	18	250	315		2200
RNHV-A-10/280	10	20	280	350		2200
RNHV-A-10/315	10	23	315	400		2200
RNHV-A-10/355	10	26	355	450		2200
RNHV-A-10/400	10	30	400	500		2250
RNHV-A-10/450	10	32	450	560		2300
RNHV-A-10/500	10	35	500	630		2350
RNHV-A-10/560	10	40	560	700		2400
RNHV-A-10/630	10	45	630	800	200015002580	2680
RNHV-A-10/710	10	50	710	900		2850
RNHV-A-10/800	10	60	800	1000		2950
RNHV-A-10/900	10	65	900	1120		3190
RNHV-A-10/1000	10	75	1000	1250		3400
RNHV-A-10/1120	10	80	1120	1400		3940
RNHV-A-10/1250	10	90	1250	1600	220017002620	4310
RNHV-A-10/1400	10	100	1400	1750		4390
RNHV-A-10/1600	10	115	1600	2000		4500
RNHV-A-10/1800	10	130	1800	2250		4550
RNHV-A-10/2000	10	145	2000	2500		4600
RNHV-A-10/2240	10	160	2240	2800		4630
RNHV-A-10/2400	10	170	2400	3000		4630
RNHV-A-10/2500	10	180	2500	3150		4630
RNHV-A-10/2800	10	200	2800	3500	360017502850	7400
RNHV-A-10/3000	10	215	3000	3750		7450
RNHV-A-10/3150	10	225	3150	3940		7500
6kV
RNHV-A-6/220	6	26	220	280	180015002550	2150
RNHV-A-6/250	6	30	250	315		2150
RNHV-A-6/280	6	35	280	350		2150
RNHV-A-6/315	6	40	315	400		2150
RNHV-A-6/355	6	45	355	450		2150
RNHV-A-6/400	6	50	400	500		2150
RNHV-A-6/450	6	55	450	560	200015002580	2200
RNHV-A-6/500	6	60	500	630		2250
RNHV-A-6/560	6	70	560	700		2300
RNHV-A-6/630	6	75	630	800		2350
RNHV-A-6/710	6	85	710	900		2400
RNHV-A-6/800	6	100	800	1000	220017002620	3800
RNHV-A-6/900	6	110	900	1120		3900
RNHV-A-6/1000	6	120	1000	1250		4000
RNHV-A-6/1120	6	130	1120	1400		4100
RNHV-A-6/1250	6	150	1250	1600		4200
RNHV-A-6/1400	6	170	1400	1750		4230
RNHV-A-6/1500	6	180	1500	1900		4230
RNHV-A-6/1600	6	195	1600	2000	300017502850	5900
RNHV-A-6/1800	6	215	1800	2250		6000

Application Areas

	Power plant Wind turbine / Compressor / Pumped hydro storage plant / Draft fan / Condensate pump / Circulating water pump / Boiler feedwater pump, etc.
	Oil, Petrochemicals, Natural gas Pipeline transfer pump / Injection pump / Feedwater pump / Submers- ible oil pump / Circulating water pump / Brine pump / Compressor / Booster fan / Oil transfer pump / Electric submersible pump, etc.
	Coal, Mining Scale removal pump / Slurry pump / Slag slurry pump / Clear water pump / Feed pump / Axial flow fan / Agitation pump / Kiln / Transmis- sion / Dust removal fan / Drainage pump / Media pump / Counter-ro- tating fan, etc.
	Cement building materials Kiln induced draft fan / Kiln forced draft fan / Kiln tail fan / Kiln head fan / Medium-temperature fan / Coal mill fan / Dust removal fan / Circu- lating fan / Raw material grinding fan / Cement grinding fan / Separa- tor fan / Pressure conveying fan, etc.
	Steel and metallurgy Blast furnace blower / induced draft fan / compression fan / air supply fan / feedwater pump / water supply pump / descaling pump / dust removal fan / converter / blast furnace / etc.
	Municipal water supply Aeration blower(for heating, water supply, sewage, etc.) / induced draft fan / air supply fan / booster pump / hot water circulation pump / sewage pump / clean water pump / lift pump / water supply pump / reclaimed water pump, etc.
	Light industry, Chemical industry Coal gas blower / booster pump / compressor / axial flow pump / soft water pump / water supply pump, etc.