As a TUV certified enterprise, INVT has established and applied quality management system which fulfills the requirement according to ISO 9001, ISO 14000 and OHSAS 18000.

 INVT has setup 30 branch offices in China which is responsible for promotion, market management, technical support and service. Besides, INVT has cooperated more than 100 distributors around China who can serve customers locally and professionally.

 Since 2006, INVT has exported products to more than 50 countries including South East Asia, Middle East, South Africa, East Europe and Latin America. Meanwhile, INVT has established more than 10 service centers worldwide where well-trained engineers can offer commissioning, trouble-shooting and warranty service to customers. Excellent feature and good quality of INVT drives have been widely recognized by esteemed customers. Furthermore, INVT will participate Hannover Fair in Germany and other professional exhibitions in target market annually to demonstrate latest products and pursue new business opportunity.

 In a word, INVT always aim to be your mutual benefit partner and professional drive solution provider.

What we can offer:
■ CHV100 series close loop vector control inverter (1.5~2000KW)
■ CHE100 series sensorless vector control inverter (0.4~2000KW)
■ CHF100 series high performance universal inverter (0.75~2000KW)
■ CHV110 series energy saving cabinet (7.5~110KW)
■ CHV130 series special inverter for wiring drawing (1.5~560KW)
■ CHV150 series high speed inverter (0~3000Hz 1.5~22KW)
■ CHV160 series special inverter for multi-pumps water supply (5.5~630KW)
■ CHV170 series special inverter for tension control (1.5~560KW)
■ CHV180 series special inverter for elevator (4~30KW)
■ CHV190 series special inverter for crane (4~560KW)
■ CHA110 series four quadrant vector control inverter (132~1200KW)
■ CHV series medium voltage inverter (1140V 22~2800KW)
■ CHH series high voltage inverter (3.3KV/6.6KV/10KV 250~7100KW)
■ DBU series braking unit (18.5~315KW)
■ RBU series regenerative braking unit (7.5~250KW)



 

3phase 220V/230V±15% 7.5kW~75kW
3phase 380V/415V/440V±15% 7.5kW~75kW
 
 Sensorless Vector Control (SVC), V/F Control
 Frequency source:compare pressure and flow signals output.
 Fast current limiting function, with an instantaneous impulse current as high as 300%
 overload capability up to 180%/30 seconds;  
 Automatic reset and power failure reset function,
 Integrated structure with dual-loop conversion circuit, ensure no system fault and no influence upon production;  
 Protection IP21,
 Multiple signal inputs: 0 ~ 1A, 0 ~ 10V, 4 ~ 20mA, 0 ~ 20mA,
 Larger torque at low frequency
 RS-485 communication function;  Unique PWM optimized design, efficient operation, with an energy-saving efficiency as high as 25% to 60% 
 Full range protection such as phase failure, overvoltage, undervoltage and overcurrent  Independent air duct design, providing better heat dissipation effect,
 preventing electrostatic dusts from causing damage to electronic components;   Small size, easy to install, user-friendly structure design; compact structure,
 Buit-in DC reactor (18.5kW~75kW)
 Speed trace function:Start Running motor smoothly
 Strong anti-jamming capability
 Compact size,easy installation.
Typical application:
Injection molding machine, Air compressor, Pressing machine, Air conditioner

Energy saving principle:

3 phase 220/230V/380V/415V/440V/460V/480V/525V±15% 5.5kW~630kW

  Control mode: V/F control
 Overload capacity: 120% rated current for 60 s
  Speed accuracy: ±0.5% max. speed (SVC)
 Speed adjusting range: 1:100
  Multi-steps speed control: 16 steps
  Built-in DC reactor from 18.5KW to 90KW to improve power factor
  Timing control: Set eight pressure reference in specific time period
  PID control: Constant pressure regulation
  Control up to 7 different pumps automatically according to pressure feedback, store specific rated current separately
  Energy saving function: Stop automatically when flow is smaller
  Timing switchover function: Prevent pump from rust, balance every pump lifetime
  Over pressure/under pressure alarm, record the faulty pump and switch the spare pump automatically.
  Dormant control
  Built-in RS 232
  Liquid level detection and control
 LCD keypad: Parameter download and upload, English version
 Automatic voltage regulation (AVR): Maintain output voltage stable when input voltage fluctuate
 Multi-functional Quick/Jog key: Access common used parameter quickly
 SHIFT key: Scroll common used parameter circularly
 Easy PLC, Multi-Speed Control Function: 16-speed Control
 Taverse Control Function
Length and Time Control Function
On-Stop Function while instantaneous power failure
Speed pick-up Function: Smoothly start the running motor
QUICK/JOG Function: Multi-function shortcut key defined by user
Automatic Voltage Adjustment Function: Keep static output voltage automatically when mains voltage fluctuating.
Up to 27 functions for failure protection: over current, over voltage, under voltage, over temperature, phase failure, over load etc.
 Option card needed: Water supply control card
Typical application:
Water supply, Air compressor, Central air conditioner

3 phase 380V/415V/440V/460V/480V/525V±15% 4kW~30kW

 control structure:DSP _32bit MCU.
 Maximum speed reach to 4m/s
 Two types speed control mode:Multi-speed and analog speed control
 Special function for maintenance
 External EPS ensure elevator emergency running
 Three forced deceleration for UP and Down to prevent crashing to bottom and proof.
 Separated PI parameter for high speed and low speed
 Holding torque, contactor control.
 Start torque compensation.
 PG card:synchronous PG card, Asynchronous PG card.
 Starting weight up function.
 Energy saving function with RBU unit.
 S curve to make elevator work smoothly
 S curve accelerate/decelerate function.
 Running function:inspect running, emergency running, force decelerate running.
 More than 30 kinds of protection.
 Support Modbus.

Sequence chart of running

 Typical application:
Elevator, Crane, Cargo cabin, Hoist equipment

3 phase 380V/415V/440V/460V/480V/525V±15%  4kW~560kW

 Internal contracting brake control and monitor function.
 Separated power supply control for control circuit and power circuit. better for faulty detection and maintenance;
 Speed increasing function for light load or without load can realize faster speed for sky-hook to improve the efficiency
 Master-slave function for speed synchronization can realize speed equilibrium to keep two crane in the same steps.
 Master-slave function for power equilibrium to make two motors balance to lift one load through one reduction gear box
 Flexible multi-control mode: manual, remote control, potentiometer control, grader remote control, grader manual control, communication.
 The second motor control and switch function can decrease the system cost
 Support PROFIBUS-DP and MODBUS
 Rope slack detection function.
 LCD parameters copy and download function to reserve setting.
 Speed monitor, Fast stop and overspeed protection
 Pre-excitation, starting torque compensation
 Better close-loop vector control,200% Mn at 0HZ
 Sensorless vector control technology achieve 0.5% control precise.
 Support dynamic braking and regenerative braking
 Plenty of external ports and strong protection.
Typical application:
 Crane for Seaport, metallurgy, machinery, architecture, chemical, transportation, power supply;
 Bridge crane, machine of railway and road construction; 
 Crane and Hoister of mine application.

1 phase 220V-plusmn;15%-nbsp; 0.75kW~1.5kW-nbsp;
3 phase 220V-plusmn;15%-nbsp; 0.75kW~1.5kW

Control methods: Sine waveform PWM Control with vector control. 32bit DSP+FPGA
Parameter setting mode: Manual control parameter setting, also can set by the communication with PC, has anti-vibration and filter functions.
Control mode: Position mode, speed mode, torque mode
Maximum input-nbsp; Pulse frequency: 500kpps(Differential), 200kpps(OC)
Encoder resolution: 1/10000, 10000 feedback pulses each circle
Encoder feedback Pulse frequency range: 0～10MHz
Pulse amplifier range: Electronics gear :A/B:A=1～65535,B=1～65535；1/50 Position accuracy: 0.072-deg;(2 feedback pulses)
Speed Control: Maximum frequency response:300MHz
Speed adjusting range: 1：5000
Speed vibration rate: -le;-plusmn;0.1%
Communication:RS485/232:Modbus.

3 phase 3.3KV/6.6KV/10kV 315kW~7100kW

 High integrated techology and completely digital control system, good anti interference ability.
 Control system power supply redundant design.
 Multi monitor for power units
 Power unit bypass function to achieve power unit redundant design.
 Standard RS485terminal to communicate with DCS.
 More than 30 kinds of protection for inverter, motor.
 Full parameters record, tempeartureand DC bus of each power unit can be monitored and indicated in display.
 High efficiency≥98% and power factor≥0.96, low harmonic design<2%.
 DSP control system optimize modulated waveform to ensure perfect waveform without harmonics
 Better energy saving function. Self-regulation for voltage when detecting light load to save energy.
 Big voltage, current margin design.adopt 1700V IGBT, twice voltage margin, twice current margin
 System and power unit bypass function. Inverter can auto switch between power frequency and variable frequency. Bypass failed power unit ,the inverter run continuously derating
 Speed trace function
 Wide national grid voltage fluctuation range ±15%.
 Adopt back-in-front-out wiring for power unit.

Touch screen:



 

380V/660V 7.5kW~250kW

-nbsp;

Adopt IGBT as regenerative module ensure low harmonics to the mains(THD is less than 4% compared with traditional rectifier unit

High braking capability:200% overload

Wide voltage range:300~460/530~790V,braking threshold voltage is adjustable.

-nbsp;

Model No.	Input voltage	Rated Power (KW)	DC rated current (A)	DC rated current (A)	Size
RBU-7R5-4	380V	7.5	13	10	-nbsp;
RBU-011-4	380V	11	19	15	-nbsp;
RBU-015-4	380V	15	26	20	-nbsp;
RBU-018-4	380V	18.5	32	25	-nbsp;
RBU-022-4	380V	22	37	30	-nbsp;
RBU-030-4	380V	30	51	40	-nbsp;
RBU-037-4	380V	37	64	50	-nbsp;
RBU-045-4	380V	45	77	60	-nbsp;
RBU-055-4	380V	55	96	75	-nbsp;
RBU-075-4	380V	75	128	100	-nbsp;

-nbsp;

1phase 220V/230V-plusmn;15% 0.4kW~2.2kW-nbsp;-nbsp;-nbsp;-nbsp;-nbsp;-nbsp;-nbsp;-nbsp;-nbsp;-nbsp;-nbsp;-nbsp;-nbsp;-nbsp;-nbsp;-nbsp;-nbsp;-nbsp;-nbsp;-nbsp;-nbsp;-nbsp;
3phase 220V/230V-plusmn;15% 0.75kW~55kW
3phase 380V/415V/440V/460V/480V/525V-plusmn;15% 0.75kW~2MW

◆Sensorless Vector Control (SVC), V/F Control.
◆Achieve excellent sensorless vector control based on DSP platform.
◆Static and rotation motor parameters autotune, ensure excellent vector control
◆Overload Capacity: 60s with 150% of rated current, 10s with 180% of rated current.
◆Starting Torque: 150% of rated torque at 0.5Hz (SVC).
◆Independent duct design
◆Speed Adjusting Range: 1:100 (SVC)
◆Speed Accuracy: -plusmn; 0.5% of maximum speed (SVC)
◆Carrier Frequency: 0.5kHz ~15.0kHz.
◆Torque Control Function: Provide multiple torque setting source.
◆PID Control Function
◆Multi-Step Speed Control Function: 8 steps speed can be set.
◆Traverse Control Function
◆None-Stop when instantaneous power off
◆Speed trace Function: Start the running motor smoothly.
◆QUICK/JOG Key: User defined shortcut key can be realized.
◆Automatic Voltage Regulation (AVR) Function:
Support local and remote operation panel at same time.make commisioning more convenient
◆Offer RS485 communication which support standard modbus RTU and ASCII protocol.
◆ Up to 24 fault protections
◆Built in DC reactor above 18.5kW to,improve power factor and efficiency
◆Built-in braking unit.
Typical application:
Textile, Dyeing, Wire, Blender, Machine tools, Printing -amp; Packing, Plastic, Blower, Air compressor

-nbsp;Wiring Diagram:

1phase 220V/230V±15% 0.4kW~0.75kW

 Output frequency: 0.00 ~ 400.00Hz
Efficiency: >98% (at rated power)
 Control mode: Sensorless vector control (SVC), V/F control
Overload capacity: 150% rated current for 60 s
 Speed accuracy: ±0.5% max. speed (SVC)
Speed adjusting range: 1:100
 Multi-steps speed control: 8 steps
 Autotuning function: Identify specific motor parameter to achieve high accuracy vector control
 Digital input: 4
 Digital output: 1
 Relay output: 1
 Analogue input: 1
 Analogue output: 1
 LCD keypad: Parameter download and upload, English version
 Automatic voltage regulation (AVR): Maintain output voltage stable when input voltage fluctuate
 Traverse control: Output triangular wave for textile industry
 Multi-functional Quick/Jog key: Access common used parameter quickly
 SHIFT key: Scroll common used parameter circularly
 Ambient temperature: -10~40 degree
 Relative humidity: <95%, no condensation allowed
 Altitude: 0~1000 m, 1000~4000 m with derating
 30 kinds of protection function
 Built-in RS 485: Support international standard Modbus RTU, Modbus ASCII and Profibus

3 phase 220V/230V±15%  1.5kW~45kW      
3 phase 380V/415V/440V/460V/480V/525±15% 1.5kW~2MW
3 phase 660V/690V±15% 11kW~2.8MW

◆ Control Mode
Sensorless vector control (SVC), Vector control with PG (VC), V/F control.
◆ Dual-CPU control platform:16bit DSP is responsible for current vector arithmetic while 32 bit ARM is in charge of control function
◆ Static and rotation motor parameters autotune, ensure excellent vector control
◆ Achieve high accuracy close-loop speed control and torque control
◆External LCD panel can monitor three parameters at the same time.Chinese/English selectable. Parameter copy function make several drives commisioning more convenient.
◆ Overload Capacity: 60s with 150% of rated current, 10s with 180% of rated current.
◆ Starting Torque: 150% of rated torque at 0.5Hz (SVC);
180% of rated torque at 0Hz(VC). 
◆ Speed Adjusting Range: 1:100 (SVC); 1:1000 (VC)
◆ Speed Accuracy: ± 0.5% of maximum speed (SVC); ± 0.02% of maximum speed (VC)
◆ Carrier Frequency: 1.0kHz~16.0kHz.
◆ Frequency reference source: keypad, analog input, HDI, serial communication, multi-step speed, simple PLC and PID. The combination of multi- modes and the switch between different modes can be realized.
◆ Torque Control Function: Provide multiple torque setting source.
◆ PID Control Function
◆ Simple PLC or Multi-steps Speed Control: 16 steps speed can be set.
◆ Traverse Control Function
◆ Length and Time Control
◆Offer RS485 communication which support standard modbus RTU and ASCII protocol
◆Built in DC reactor above 18.5kW to,improve power factor and efficiency
◆Built-in braking unit.
◆ Non-Stop Function while instantaneous power failure
◆Speed Trace Function: Smoothly start the running motor.
◆ QUICK/JOG Function: User defined shortcut key can be realized.
◆ Automatic Voltage Regulation (AVR): Automatically keep the output voltage stable when input voltage fluctuating
◆ Up to 29 fault protections:
Protect from over current, over voltage, under voltage, over temperature, phase failure, over load etc.
Typical application:
Elevator, Crane,Textile,Paper,Iron - Steel, Printing
Wiring Diagram:

1 phase 220V/230V±15% 0.75kW~2.2kW                        
3 phase 220V/230V±15%  0.75kW~55kMW
3 phase 380V/415V/440V/460V/480V/525V±15%  1.5kW~2MW

Input Frequency Range:   47~63Hz
Output Voltage Range:     0~rated input voltage
Output Frequency Range:  0~400Hz
Control Mode: V/F control.
Overload Capacity: 60s with 150% of rated current, 10s with 180% of rated current.
Speed Adjusting Range: 1:100.
Carrier Frequency: 0.5kHz ~15.0kHz.
Frequency reference source: keypad, analog input, HDI, serial communication,      multi-step speed, simple PLC and PID. The combination of multi- modes and the switch between different modes can be realized.
PID Control Function
Simple PLC, Multi-Steps Speed Control Function: 16 steps speed can be set.
 Traverse Control Function
 Length and Time Control Function
 None-Stop when instantaneous power off.
Speed Trace Function: Smoothly start the running motor.
QUICK/JOG Key: User defined shortcut key can be realized.
 Automatic Voltage Regulation Function (AVR):
Automatically keep the output voltage stable when input voltage fluctuating
Offer RS485 communication which support standard modbus RTU and ASCII protocol.
Simple water supply control: drive 1 variable speed pump and 2 fixed speed pump.
Drive larger variable torque load directly, eliminate warehouse and fasten delivery time.
Built in DC reactor above 18.5kW to,improve power factor and efficiency
Built-in braking unit(up to 15kW ).
 Up to 23 fault protections:
Protect from over current, over voltage, under voltage, over temperature, phase failure, over load etc.
Typical application:
Cement, Ceramic, Glass, Water treatment, Plastic, Food - Beverage, Power plant, Oil - Gas, Air conditioner, Conveyor
 
Wiring Diagram:

3 phase 380V/415V/440V/460V/480V/525V±15% 2.2kW~560kW

 high performance vector control.
 Simatic platform
 Built in multifunction to simplify system, reduce cost, and improve reliability
 Multi levels speed synchronous function
 Speed difference or pressure sensor feedback synchronous rolling winding control
 Free PID function for constant tension control and constant line speed control
 Multi drivers with load balance function.
 Constant line speed rerolling control without external control circuit.
 Pre-drive, tension taper rolling control function.
 Easy parameters setting, Built-in fixed simatic and parameters.
 Logical terminals output warning for analog input and internal process value
 Transistor output PLC to modify the parameters of inverter.
 Each analog input can modify the parameters of inverters, no need communication.
 Continuous annealing function.
 Built in Wire twisting machine control function
 Drawbench function withouy PLC.
 Zero position transfering function. Up/down function , On/Off function, Taper control and braking function module built in.
Typical application:
Wire drawing machine, Drawbench, Winder and unwinder

3 phase 380V/415V/440V/460V/480V/525V±15% 1.5kW~22kW

 Output frequency: 0.00 ~ 3000.00Hz
Efficiency: >98% (at rated power)
 Control mode: Vector control with PG (VC), sensorless vector control (SVC), V/F control
Overload capacity: 150% rated current for 60 s (SVC), 180% rated current for 10 s (VC)
 Speed accuracy: 0.5% of max speed (SVC), 0.02% of max speed (VC)
 Speed adjusing range: 1:100 (SVC), 1:1000 (VC)
 Multi-steps speed control: 16 steps
 Built-in DC reactor from 18.5KW to 90KW to improve power factor
 Digital input: 6 (1 high speed pulse input)
 Digital output: 1
 High speed pulse output: 1
 Relay output: 2
 Analogue input: 2
 Analogue output: 1
 Automatic voltage regulation (AVR): Maintain output voltage stable when input voltage fluctuate
 Built-in PID control
 Multi-functional Quick/Jog key: Access common used parameter quickly
 Dual-CPU control platform: DSP--current vector control algorithm; 32 bit MCU--application control
 SHIFT key: Scroll common used parameter circularly
 Speed trace function
 Length control
 Torque control
 Static and rotation autotuning: Identify specific motor parameter to achieve high accuracy vector control
 Non-stop function while instantaneous power failure
 Traverse control: Suitable for textile industry
 LCD keypad: Parameter download and upload, English version
 Ambient temperature: -10~40 degree
 Relative humidity: <95%, no condensation allowed
 Altitude: 0~1000 m, 1000~4000 m with derating
 30 kinds of protection function
 User can plug in option card to achieve specialized inverter for different application
 
Typical application:
Machine tool

3 phase 380V/415V/440V/460V/480V/525V±15% 2.2kW~560kW

 Sensorless torque control mode combine with precise rolling diameter and auto torque compensation algorithm.
 Built-in speed+torque control mode to reduce tension fluctuation.
 Simatic platform
 Built in multifunction to simplify system, reduce cost, and improve reliability
 Multi levels speed synchronous function
 Speed difference or pressure sensor feedback synchronous rolling winding control
 Free PID function for constant tension control and constant line speed control
 Multi drivers with load balance function.
 Constant line speed rerolling control without external control circuit.
 Pre-drive, tension taper rolling control function.
 Easy parameters setting, Built-in fixed simatic and parameters.
 Logical terminals output warning for analog input and internal process value
 Transistor output PLC to modify the parameters of inverter.
 Each analog input can modify the parameters of inverters, no need communication.
 Continuous annealing function.
 Built in Wire twisting machine control function
 Drawbench function withouy PLC.
 Zero position transfering function. Up/down function , On/Off function, Taper control and braking function module built in.
Typical application:
Printing, Paper, Chemical fiber, Packing
 

3 phase 380V/415V/440V/460V/480V/525V-nbsp; 132kW~1200kW

-nbsp;Less current harmonics in the Grid side. Base waveform power factor is close to 1(full load)
-nbsp;Excellent close loop vector control, Zero speed 200% Mn..
-nbsp;Three kinds control mode: sensorless vector control, vector control with PG, V/F control.
-nbsp;The same structure of rectifier and inverter unit, Simplify the system., easy to maintenance.
-nbsp;Sine wave regenerative braking unit, save the energy, protect environment;
-nbsp;Same structure for power unit of rectifier and converter;
-nbsp;Separate control for rectifier and converter;
-nbsp;Special function for lifting application: Logic control when power on, brake control, pre-excitation, overspeed protection, compensation of starting torque and so on;
-nbsp;Support PROFIBUS-DP and MODBUS;
-nbsp;Master-slave function can realize the power equilibrium and speed synchronization;
-nbsp;The second motor control and switch function can decrease the system cost;
-nbsp;Different external port can be used on different application.
-nbsp;Double protection of system and unit module, sequential control when power on, gate control and automatically save before faulty.

Typical application:

-nbsp;STS (SHIP-TO-SHORE CRANE), RMG, Gantry crane, lading machine, unloading machine, dumper;
-nbsp;Big tonnage crane-bridge and gate (bigger 40 ton );
-nbsp;Crane for mine, conveyer;-nbsp;
-nbsp;Rolling mill of multi-motors, hoister for blast furnace;-nbsp;-nbsp;-nbsp;
-nbsp;Centrifuge, pouring washer;
-nbsp;Segment drive for paper machine;
-nbsp;Centrifugal casting machine, large punch machine.

-nbsp;

220V/380V/660V/1140V-nbsp; 55kW~315KW

High braking capability:Brake continuously for full load when braking rate is 50%:
Barke for five minutes for full load when braking rate is 100%

Wide voltage range : offer six braking threshold voltage
Comprehensive protection function: prevent inverter from short circuit of braking resistor

-nbsp;

Suitable for drives from 0.75KW~630KW.
EMC filter is used to minimize interference and radio noise in order to meet EMC compliance.
-nbsp;

Suitable for drives from 0.75KW~630KW.
In order to prevent the rectifier damage result from the large current, AC reactor should be installed at the input side. It can also prevent rectifier from sudden variation of power voltage or harmonic generated by phase-control load.
-nbsp;

Suitable for drives from 0.75kW~630KW.
When the distance between inverter and motor is more than 50m, inverter may be tripped by over-current protection frequently because of the large leakage current resulted from the parasitic capacitance with ground. And the same time to avoid the damage of motor insulation, the output reactor should be installed.
-nbsp;

Suitable for drives from 0.75KW~630KW.
DC reactor is used to improve power factor. Our inverters from 18.5KW to 90KW have built-in DC reactor.
-nbsp;

Offer extended I/O terminals for CHV series inverter.
-nbsp;Digital output: 1
-nbsp;Digital input: 4
-nbsp;Relay output: 1
-nbsp;Analogue input: 2
-nbsp;Analogue output: 1
-nbsp;RS485: 1

Permit both push/pull input and open collector input
Offer frequency devision output: Frequency division factor can be selected by dial switch
Soft wire connection, can acquire exact speed and rotation of motor from incremental encoder

This card can provide RS485 and RS232 communication port for CHV series inverter.
The protocol is Mudbus.

One inverter can control up to seven pumps to make the constant-pression water supply.

-nbsp;

-nbsp;

Get two loop signal from flow and pressure, convert and filter signal, give feedback to inverter.

Frequency Inverter for Wire Drawing Application CHV130 Series

20)-nbsp;30 kinds of protection function

-nbsp;

Special function:

1) Multi-speed synchronous control

2) Constant tension control

3) Rolling control

4) Sequential anneal control

5) Winder and unwinder control

-nbsp;

Typical application:

Wire drawing machine, Drawbench, Winder and unwinder

-nbsp;

Wiring Diagram:

Wiring Diagram

Wiring Diagram:

Wiring Diagram

-nbsp;

I. Principle for Energy Saving

According to the theory of hydrodynamics, the relationship among motor shaft power (P), air quantity (Q), and pressure (H) is defined by the following formula:

P=K*H*Q/-eta;

Where, K is a constant;

-eta; indicates efficiency.

Their relationship with rotation speed N is as follows:

Q1/Q2=N1/N2
H1/H2= (N1/N2)²
P1/P2= (N1/N2)³

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Curve 1 in the above figure represents the characteristic curve for pressure (H) and air quantity (Q) of the fan at a constant speed. Curve 2 indicates the wind resistance characteristic of the pipeline network (valve opening: 100%). Suppose the fan is designed to work at its highest efficiency at point A, and the output air quantity Q1 is 100%. At this time, the shaft power P1=Q1*H1, in direct proportion to the area AH10Q1. If the air quantity is required to decrease from Q1 to Q (70%, for example) according to technologic requirements, the pipeline network resistance can be increased by adjusting the valve. At this time, the resistance characteristic of the pipeline network changes to curve 3, and the system operates at point B instead of the original point A. In this case, we can see from the above diagram that the air pressure increases, and shaft power P2 is in directional proportion to the area BH20Q2, with slight decrease. If the rotation speed of the fan is decreased from N1 to N2 by the use of an inverter for speed regulation, based on the proportion law of the fan, we can draw the characteristic curve for pressure H and air quantity Q for the fan at the speed of N2, as shown in curve 4. At the same air quantity Q2, pressure H3 decreases sharply and the power P3 (equal to the area CH30Q2) also decreases drastically. The saved power △P=△HQ2, in direct proportion to the area BH2H3C. The energy saving effect is obvious.

Based on hydrodynamics, air quantity Q is in direction proportion to the rotation speed, pressure H is in directional proportion to the square of the rotation speed, and shaft power P is in directional proportion to the cube of rotation speed. When the air quantity decreases and the rotation speed of fan drops, the shaft power decreases sharply.

For example, when the air quantity drops to 80% and the rotation speed to 80%, the shaft power decreases to the 51% of the rated power. When air quantity drops to 50%, the power P drops to the 13% of the rated power. The power actually saved may not be so drastic due to the influence of actual working conditions, but the energy will be considerably saved.

Therefore, in mechanical equipment with fans and pumps, the use of inverters to adjust air quantity and flow rate is the most effective way of energy saving.

II. Working Principle

With the application of the latest computer control technology, INVT energy saving controller uses pressure sensor signals and related electric control signals to keep the pressure at a desirable value according to the rotation speed of the motor of the pressure control pump for water supply pipelines, thus saving unnecessarily consumed energy and saving electricity.-nbsp;

2. Block diagram of basic working principle

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Frequency Inverter 1140V CHV Series

Selection Guide

Frequency Inverter for Tension Control Application

CHV170 Series

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Main technical features:

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1) Power range: 4~110KW

2) Voltage: 3AC 380V -15%~15%

3) Output frequency: 0.00 ~ 400.00Hz
4) Efficiency: >98% (at rated power)

5) Control mode:-nbsp;Vector control with PG (VC), sensorless vector control (SVC), V/F control
6) Overload capacity: 150% rated current for 60 s (SVC), 180% rated current for 10 s (VC)

7) Speed accuracy: 0.5% of max speed (SVC), 0.02% of max speed (VC)

8) Speed adjusting range: 1:100 (SVC), 1:1000 (VC)

9) Multi-steps speed control:-nbsp;16 steps

10) Built-in DC reactor from 18.5KW to 90KW to improve power factor

11) Digital input: 6 (1 high speed pulse input)

12) Digital output: 1

13) High speed pulse output: 1

14) Relay output: 2

15) Analogue input: 2

16) Analogue output: 1

17)-nbsp;Ambient temperature: -10~40 degree

18) Relative humidity: <95%, no condensation allowed

19) Altitude: 0~1000 m, 1000~4000 m with derating

20)-nbsp;30 kinds of protection function

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Special function:

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1) Tension control with feedback

2) Tension control without feedback

3) Offer two PID control setting: Autotune PID control according to line speed, semidiameter and running frequency

4) Intelligent torque compensation control

5)-nbsp;Multidimensional taper-nbsp;control

6) Zero speed tension control

7) Constant length control

8) Synchronous speed control

9) Winder diameter calculation and reset function

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Typical application:

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Printing, Paper, Chemical fiber, Packing

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Wiring Diagram:

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Wiring Diagram

High Speed Inverter CHV150 Series

21) SHIFT key: Scroll common used parameter circularly-nbsp;

22) Speed trace function

23)-nbsp;Static and rotation autotuning: Identify specific motor parameter to achieve high accuracy vector control

24) Non-stop function while instantaneous power failure

25) LCD keypad: Parameter download and upload, English version

26) Built-in bypass system: Shorten commissioning time

27)-nbsp;Compact size, dust-proof

28) Independent cooling duct

29) Ambient temperature: -10~40 degree

30) Relative humidity: <95%, no condensation allowed

31) Altitude: 0~1000 m, 1000~4000 m with derating

32)-nbsp;30 kinds of protection function

33) User can plug in option card to achieve specialized inverter for different application

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Typical application:

Machine tool, Spinning motor, Textile

Wiring Diagram