AC70

Vector Control Frequency Inverter

Shenzhen Veichi Electric Co., Ltd is a high-tech enterprise that is professionally engaged in the development,manufacturing
and marketing of industrial automation control products, and committed to becoming a global leading provider of industrial
automation control products and system solutions.

The company owns powerful R&D team, relatively perfect production system, independent intellectual property and
manufacturing bases in Shenzhen and Suzhou. To improve our R&D strength, we keep on introducing advanced overseas
technology and broadening our partnerships with first-class universities and research institutions.

The main products of Veichi Electric include a variety of Variable Frequency Drive(VFD), Servo Drive System, Photovoltaic
Inverter, PLC, HMI, Automation Equipment, etc, which are widely used in industries such as oil&gas,chemical industry,
ceramic, crane&hoist, metallurgy,electrical cable and wire, plastic, print and package, textile, metal work and cable, coal
mining and municipal engineering. Suitable solutions and products are always ready to meet the demands and improve
comprehensive competitiveness of users.

With the spirit of "Innovation is the lifeblood of Veichi", we're committed to becoming one of the leading providers of electric
drives, industrial control and green energy products.Veichi has set up more than 40 brand offices in China and dozens of
partners in Asia, Europe and Africa. Veichi has been named Chinese Electric Industry's Top Ten National Brands, Chinese
Electric Industry Top Ten Satisfying Brands and Top Ten National Brands of Inverter Industry.Veichi products have become
the first choice of many enterprises.

01
 AC70
Vector Control Inverter
220V level （single phase） 0.4KW - 2.2KW 380V level （Three phase） 0.75KW-1000KW

220V level （Three phase） 0.75KW- 30KW 660V level （Three phase） 7.5KW - 1000KW

1140V level（Three phase） 30KW - 1100KW

High stability Cost-effective

High Precision Environmental adaptability

High responsiveness Friendly interface

Vector control without PG torque response speed. Component life design,extending product lifetime.
Vector control without PG torque precision control. Compact,ultra-small size design,adapt to different types of
Vector control without PG:150% rated torque when 1Hz. loads challenges.
Wide voltage range:Allowable voltage fluctuation range. Independent duct design,improve the anti-dust capability,
Super overload capacity:150% rated current 60 seconds. penetrating installation,more adaptable.
180% of rated current 2 seconds,200% moment trip. Removable DC fan design to ensure quiet and smooth
operation,easy for cleaning and replacement.
Keyboard plug and play,support external access,Chinese/
English panel supporting data copying.

02
Two drive control modes

V / F control
The control mode is used in all variable
speed control that does not require fast
response speed and high-precision
control and in situations where one
inverter connecting multiple motors; and
the mode can be used when the motor
parameters are not clear or can not use
the self-study.

Vector control without PG

This mode is used in all variable speed
control, when the high-accuracy speed
control is needed, please set to this
mode, which has rapid torque response,
and a large torque can be obtained in
low speed running.

Best use: suitable for stamping machinery requiring instantaneous high torque and fast response current.

Rich self-study function

Rotating self-study and static self-study can be selected through parameter settings
The mode is most suitable when motor and load can not be disengaged, when motor and gear box is connected
Static self-study to make accurate electrical parameters after self-study, thereby obtaining a high starting torque, high-speed,
and high-precision control.

This mode is most suitable when motor and load can be disengaged or no-load running situation. So the
Rotating auto tuning
mechanical equipment can obtain high starting torque, high-speed, and high-precision control.

Speed tracking mode

In light load one inverter can drive several motors to start tracking and to optimize the hardware and software tracking
function, in which case the speed tracking precision and reliability are much higher.
1 100A/ 2 10.0V/ 3 4 2.220s 1.000s/ 1 100A/ 2 10.0V/ 3 4 2.220s 1.000s/

Software Tracking Hardware Tracking

Best Uses: Suitable for mechanical equipment such as fans, blowers that are equipped with a rotary device.

03
 Standard swing frequency function
Uniform surface winding
No swing frequency function
Raised sides
Constant
speed
winding

Synthetic fiber yarn

Deviation limit
The main purpose is to avoid wobble when Swing frequency back
and forth

winding and reduce static electricity.

Output frequency
The thread is better than the thread produced Swing
frequency f1
f f f
by equipment without this feature, which
improves the quality and production efficiency Swing
frequency f2
f f f
of the product. Time

Acceleration time1
T2 T1 T2 T1 T2 Deceleration time1

Run command

Swing frequency operation schematic

Best use: suitable for chemical fiber and other places, the parameters can be freely set by the swing
frequency amplitude, speed and other relevant parameters.

Multiple PID controls

PID control is divided into ordinary PID and closed-loop pressure special PID with a broader scope and more specific
feature.
Feedback
PID given value Given value
PID Controller Inverter Motor
（Percentage）

Time

Sensor
Output
frequency

PID given value

Feedback channel Sampling
gain period
（Percentage）
Time

PID control schematic PID control deviation limit schematic

Best Uses: Suitable for fluid machinery, such as fans, pumps, blowers, etc.

Energy saving

100

A new generation of energy-saving

90
Overall efficiency（

operation, the use of energy-saving Efficiency

improving 9%
inverter control can achieve high 80
Efficiency
improving 6%
efficiency operation of induction motor. 70
）

60 Asynchronous motor
In operation, the drive automatically Frequency Control

calculates the optimum output voltage 50 Asynchronous motor

Frequency running

and supplies it to the load in order to

40
achieve the purpose of saving energy. 0 25 50
Running frequency（Hz）

380V 4.0KW Application cases of fans and pumps

04
Load resilience

Torque response characters

Urgent
Automatic current limiting technology, automatic accelerate
Add sudden
100% load
reduce load
frequency control technology to deal with the load
Torque
mutations.
Avoid frequent trouble on the inverter, affecting Speed
productivity, ensure its rapid response.

Current

Best use: suitable for injection molding machine, EPS power supply, ball mill and other impact loads.

Professional instantaneous stop without power off algorithm to deal with

interference electricity of power grid.

In a lighter load or high inertia loads instantaneous

Power
power compensation can be implemented.

Eliminating the need for UPS (uninterruptible power supply),

Motor speed
and other special equipment.When low voltage is detected,
Output frequency
Activate no stop running
automatic instantaneous power compensation can be when instantaneous power
loss
implemented. Invalid no stop running when
instantaneous power loss
Search free-running state speed, easily re-start to improve Activate no stop running when
DC bus voltag instantaneous power loss
the reliability of the whole system. Invalid no stop running when
Minimum bus voltage threshold instantaneous power loss

Best Uses: Suitable for dehydration machine,film production line, fans, pumps and other devices that need
instantaneous power control.

Communication method

S7-300PLC
Standard RS485 communication,support
PROFIBUS-DP communication protocol.
Profibus-DP
Convenient for the achievement of PC and
PLC connection to realize remote monitoring.

...
AC70 AC70 AC70 AC70

Best use: suitable for industrial control, smart instrumentation and other site communications needs.

You can use a DC power supply

DC power supply can be used directly, especially

for the common DC bus program and EPS power
supply.
More
Insurance Insurance Insurance
Energy efficient, environmentally friendly and
economic.
Input Power DC bus

05
Random carrier function
Random carrier function can effectively reduce motor noise and suppress Inverter interference on external devices.

1 100A/ 2 10.0V/ 3 4 2.220s 1.000s/ 1 100A/ 2 10.0V/ 3 4 2.220s 1.000s/

Interference signal under fixed-carrier is strong Noise can be effectively reduced in random carrier

Mounting mode

AC70 inverter penetrating installation diagram

Full range of DC fan, easy to replace with Aluminum heatsink module

longer life. Penetrating installation, more

Wall mounted mounting holes

adaptable.

Penetrating secure installation

Cabinet machine adopts up and down
design with standard chokes mounted on
the base so that the cooling is better,
improving the life of the machine, at the
same time the wiring is more beautiful. Independent duct design Penetrating installation(11KW alow)

Environmental resistance design

Three anti-treatment Automatic, full painting

PCB three anti-paint treatment: anti-moisture,
anti-salt, anti-fungal.

Protection class
Protection class is IP20, higher protection
class products can be customized.

Equipped with moisture,dust resistant,

vibration-resistant reinforced products.

06
 Solutions of AC70 series frequency inverter on compressor

1. Save energy. Pressure Transmitters

2. Reduce operating costs.
3. Improve the accuracy of pressure control.
4. Extend the life of the compressor.
5. Reduce compressor noise.
6. PG without vector control,long-term operation
at 20Hz according to the load characteristics
of compressor. Piston air compressor
7. Adaptable to the environment,wide input voltage,
AC70
output voltage automatic voltage regulation(AVR Frequency
function). Allowable range of input power; voltage inverter

380V ±15%;frequency 50Hz±15%.

Electric motor

8. Built-in advanced PID algorithm, fast response, high constant pressure precision.
Set the target pressure and the actual feedback constant pressure to do the PID operation parameters, so that real-time
speed adjustment can be implemented according to the gas situation, stepless adjustment of the motor speed, and the
air compressor gas pressure remains constant, effectively improving the quality of working conditions.
9. International standard MODBUS communication protocol;inverter control board with standard 485 communication
module,convenient for the communication between the air compressor customer and air compressor controllers.
10. Provides users with up to 20 kinds of fault protection features to achieve full protection from the drive to the motor and
the peripheral devices. Built-in lightning over current protection device effectively improves the self-protection of
lightning.
11. When powering on the inverter, the system would implement complete security system check of software and hardware,
and securely protect the function parameters and settings to prevent wrong function parameter settings.

Suitable scope:

Roots
Back and Rotary Axial flow
Vane mode double
forth mode mode mode
rotor mode

07
 Solution of AC 70 Series Inverter on Drawing Machine

Water tank type wire

1. High-performance low-frequency torque drawing machine
characteristic. Unwinding stick Cable machine Up roll

2. Advanced built-in PID loop control Mould1/2/3/4

algorithm.
3. High-speed control CPU core.
4. Complete fault protection function; perfect
three anti-paint treatment process, EMC Tension roller
design adaptable to application
environment.
5. Vector control technology, high-precision Tension

steady speed. feedback

signal
6. Simple system,18.5KW and below built-in
braking unit with no external device and
it's low cost. Frequency inverter can fully
Feedforward signal
achieve the main electrical control of wire
drawing machine without external
controller.
7. Reasonable factory parameters can be Main pull AC70 Wind-upAC70
adapted in most suitable occasion.
8. Start logic control and coil diameter
calculation function to ensure that the
machine can smoothly start in any reel
diameter; stable winding model can
realize automatic identification, setting volume diameter and automatic tracking the host speed.

9. Parameter copy feature allows batch applications becoming more convenient.

10. High-speed/low-speed gear switching function can meet various requirements so that the drawing process becomes more
energy efficient.

Suitable scope:

Water tank Dual-roll Looper

Pulley wire Linear
type wire type wire wire
drawing drawing
drawing drawing drawing
machine machine
machine machine machine

08
 Solutions of AC70 Series Used on CNC Machine Tool

1. Simplified control circuits, various kinds of flexible

control modes.
2. Convenient debugging. Users can debug various Spindle drive
kinds of operating parameters via the intelligent
keyboard and monitor. It is easy and flexible to set
or change parameters within a short debugging
time.
3. Large torque at low frequency. Comparing with
similar products, AC70 has stronger ability in feed CNC system
and cut which improves the working efficiency and
productivity of CNC machine.
Analog output 0~10V
4. With Stable speed and open-loop vector control,
AC70 greatly improves the manufacturing
precision of CNC machine tool. 30~4500r/min
5. Compact structure design.
6. The output frequency of each range is stable. Its
overload capacity is strong that the starting torque can reach 150% at 1.0Hz.
7. Fast dynamic torque response speed, faster acceleration and deceleration speed which reaches up to 0.1 seconds. It meets
the processing requirements of mechanical devices and improves the working efficiency of each CNC machine.
8. Optimal limiting ability of current and voltage, super strong antimutagenicity capacity and overload ability, precise current
loop control. When there is shock load or other external power grid disturbances, the trip protection is not apt to be triggered,
better ensuring continuous and stable production of equipments.
9. Simplified servo function, precise poisoning from each random angle.
10. Various flexible control modes meet a wide variety of complex working conditions. It provides multiple output terminal
signals such as fault output signals, running signals, speed signal and so on, which perfectly meets the requirement of
system in monitoring the spindle speed state.

Suitable scope:

Metal-cutting Forging Woodworking Lathe Crankshaft

Machine Machine Machine Machine Machine
Tool Tool Tool Tool Tool

09
 Solutions of AC70 Series Used on Industrial Washing Machine

1. During the starting process, the industrial washing machine requires large starting torque as the clothes have absorbed
water. AC70 can provide enough starting torque at low frequency and maintain stable starting.
2. During the washing process, the running frequency is between 8-15Hz and there is eccentric load. The powerful torque
and slip compensation of AC70 ensures the stability of washing process.
3. During the uniform distribution process of clothes, the speed increases gradually with serious eccentric load. The
overcurrent suppress function effectively adjusts speed fluctuation during the eccentric status.
4. During the dewatering process, washing machine requires that the variable frequency drives can run stably at high speed.
The wide frequency range ensures dewatering processes at one go.
5. Stable performance. AC70 with brand-new design ensures the stable running of industrial washing machine in severe
environment such as high humidity and high temperature.
6. Allowance design of IGBT module suits long-time regular positive and reverse rotating running at large current.

7. AC70 frequency inverter adopts special PWM which

solves motors' requirements of starting at low
frequency and weakening flux at high frequency.
8. Thickened conformal coating suits high temperature
and humid environment.
9. Unique voltage and frequency curves, various
multi-speed control mode.
10. Powerful low frequency load capacity and braking
capacity.

Suitable scope:

Semi-
Automatic Normal
automatic
type type
type

10
 Solutions of AC70 Series in Construction Lifting Area

1. Wide voltage range design meets S7-300PLC

severe power grid.
2. Obvious energy-saving effect.
Usually it saves up to 20% energy.
3. Precise torque control, dynamic
response speed and “S” shape
running speed curve that it ensures
the smooth acceleration and
deceleration with no impact sensitivity.
4. Complete protection function, high
security and strong anti-interference
ability.
5. AC70 provides stable and high
output torque at low frequency
section as well as strong overload
capacity.
Lifting Position Slewing Luffing
6. With perfect conformal coating mechanism encoder mechanism mechanism
treatment, independent air duct
design and wide voltage range design, AC70 can meet application environment of various industries and harsh power
environments.
7. With DC braking, energy consumption braking and more braking modes, AC70 maintains the construction elevators
running more reliably and heavy-load parking more stably. It also has precise torque control and stall prevention function.
8. AC70 combines CPU centralized control and PLC circuit interface, which maintains speed control system with high
reliability and increases the system's anti-inference ability. Meanwhile, it takes advantage of CPU's powerful control
functions to achieve flexible control modes.
9. It is capable of achieving soft start and soft stop with reduced mechanical wear which makes the running more stable and
reliable. AC70 ensures high security and accurate parking position that the no-load parking position is consistent with the
heavy-load parking position. It indirectly increases objective economic benefits.
10. Continuous and convenient speed adjustment. Sectional speed setting and continuous speed adjustment is supported.
It features rich functions, stable performance, small size, low noise operation and more.

Suitable scope:

Construction Tower
Hoist Winch Crane
Elevator Crane

11
 Standard Wiring Diagram

output reactor
AC power input

breaker contactor input reactor

R R U U

S S V V M
~
T T W W

Frequency Inverter Shielded cable or armored cable

(grounded near the inverter)
Note2 E
+24V ( grounding resistance less than 10Ω )

( factory shorted)
PLC
AC220V maximum output of contact

passive contact output

3A/240VAC
(forward running ) X1 5A/30VDC
multi- function contact input

TA coil
( reverse running ) X2
TB
(forward jog ) Shielded cable or armored cable
X3 (grounded near the inverter)
TC
(reverse jog ) X4
AC0V
(free parking) X5

(failure reset ) X6 +24V

coil
Y1

open collector output

COM Shielded cable or armored cable
Note: The functions inside the brackets are the (grounded near the inverter)
factory settings of variable frequency drive.

coil
Y2

COM
Note:
1. +24V port maximum output: DC24V/100mA
Y1/Y2 port maximum output: DC24V/50mA
Note4
pulse input PUL
10
J1
toggle _
mA
frequency control input

J2 switch

20
0
Shielded cable or armored cable
(grounded near the inverter) J3
+ -

analog monitor output signal

A02
current analog input +10V
GND Shielded cable or armored cable
（0~20mA)/（4~20mA) ( grounded near the inverter)
AS
J4 select
5

VR minimum 2KΩ VS1 pin _

V
J5
10
0

VR Note3
Voltage analog input VS2 + -
（0~5V)/（0~10V ) A01
GND
GND
Note:
1. +10V port maximum output: 50mA Note3:
2. VS1/VS2 port resistance: 89KΩ The maximum output is 2mA when the A01/A02 port
3. AS port resistance: 250Ω is set as the frequency and voltage type signal output.

Legend:
1. Mark stands for main circuit terminals.
2. Mark stands for control circuit terminals.

braking resistor

brake unit
Note1 DC reactor DC+
braking resistor
AC power i nput

breaker contactor input reactor DC-

output reactor
R R （-） （+） PB
U U
AC power input

breaker contactor input reactor output reactor

S S V V M
~ R R
P1 （+） （-） U U
T T 18.5KW or less W W
V
S S V M
22KW/30KW optional for Shielded cable or armored cable
(grounded near the inverter)
~
W
built-in resistor E T T W
(Grounding resistance less than 10Ω)
37KW(inclusive) and aboveE Shielded cable or armored cable
(grounded near the inverter)

(Grounding resistance less than 10Ω)

Note:
1. When installing a DC reactor, be sure to remove the jumper between terminals P1, (+).
2. Multi-function input terminals (X1,X6) can select NPN or PNP transistor as the input signal, the bias voltage can select the inverter internal power supply (+ 24V terminal),
or you can choose an external power supply (PLC terminals) Preset "+ 24V "and" PLC "short.
3. The analog monitor outputs are the outputs of frequency meter, ammeter, voltmeter and other special instruction, and they cannot be used for feedback control and other
control operations.
4. Due to the presence of various types of pulse practice, please refer to AC70 series manual for specific wiring scheme.

12
AC70 Installation Dimension

W D Installation
Frequency Outer dimension Installation
W1 D1 hole location hole
inverter model W H D D1 W1 H1 diameter

AC70-S2-R40G
AC70-S2-R75G 122 182 154.5 145 112 171 ф5
AC70-S2-1R5G
AC70-S2-2R2G 159 246 157.5 148 147.2 236 ф5.5
AC70-T3-R75G/1R5P
H1
H

AC70-T3-1R5G/2R2P 122 182 154.5 145 112 171 ф5

AC70-T3-2R2G/004P
AC70-T3-004G/5R5P
159 246 157.5 148 147.2 236 ф5.5
AC70-T3-5R5G/7R5P
AC70-T3-7R5G/011P
195 291 167.5 158 179 275 ф7
AC70-T3-011G/015P

W
W1 D

Installation
Frequency Outer dimension Installation
hole location hole
inverter model
W H D D1 W1 H1 diameter
AC70-T3-015G/018P
235 345 200 311 160 331.5 ф7
AC70-T3-018G/022P
AC70-T3-022G/030P
255 410 225 370 180 395 ф7
AC70-T3-030G/037P
H2
H1

AC70-T3-037G/045P
H

AC70-T3-045G/055P 305 570 260 522 180 550 ф9

AC70-T3-055G/075P
AC70-T3-075G/093P
AC70-T3-093G/110P 380 620 290 564 240 595 ф11
AC70-T3-110G/132P

安装孔径

W
W1 Wall mounting dimensions
D
Outer dimension Installation
Frequency Installation
hole location hole
inverter model W H D D1 W1 H1 diameter
AC70-T3-132G/160P 500 780 340 708 350 755 ф11
AC70-T3-160G/185P
AC70-T3-185G/200P 650 1060 400 950 400 1023 ф16
AC70-T3-200G/220P
H1

AC70-T3-220G/250P
H2
H

AC70-T3-250G/280P 750 1170 400 1050 460 1128 ф18

AC70-T3-280G/315P
AC70-T3-315G/355P
AC70-T3-355G/400P 850 1280 450 1150 550 1236 ф20
AC70-T3-400G/450P

13
 W D

Cabinet mode installation dimension

Installation
Frequency Outer dimension Installation
hole location hole
inverter model W H D H1 W1 D1 diameter
AC70-T3-160GD/185PD
H1

AC70-T3-185GD/200PD 650 1600 400 1500 492 332 ф14

H

AC70-T3-200GD/220PD
AC70-T3-220GD/250PD
AC70-T3-250GD/280PD 750 1700 400 1600 582 332 ф14
AC70-T3-280GD/315PD
AC70-T3-315GD/355PD
AC70-T3-355GD/400PD 850 1800 450 1700 622 382 ф14
AC70-T3-400GD/450PD
D1

W1

W D
H1
H

Installation
Frequency Outer dimension Installation
hole location hole
inverter model W H D H1 W1 D1 diameter
AC70-T3-450G/500P
AC70-T3-500G/560P 1200 1850 550 1750 960 466 ф14
W1 AC70-T3-560G/630P
D1

14
Shenzhen Veichi Electric Co., Ltd Suzhou Veichi Electric Co., Ltd
Block C, Wentao Science and Technology Park, Shiyan No.111 Wusongjiang Avenue, Guoxiang Street, Wuzhong District, Suzhou, China
Yingrenshi Community,Baoan District, Shenzhen, China Service hotline :400-600-0303
*Version:2016 V1.0
Tel:+86-755-2968 5610 (EXT 835) Http://www.veichi.com Shenzhen Veichi Electric Co., Ltd all rights
reserved, subject to change without notice.
Fax:+86-755-2968 5615 E-mail:overseas@veichi.com