AC70 Sensorless Vector Control Inverter
  • AC70 Sensorless Vector Control Inverter

AC70 Sensorless Vector Control Inverter

Wide voltage range: allowable voltage fluctuation range is ±15%.
High torque response speed, 20ms in OLV without PG.
High torque control accuracy in OLV without PG.
Compact structure design, high durability and high adaptability to environment.

AC70 sensorless vector control frequency inverter is one of the most best-selling low voltage inverters of Veichi that it is famous for its great quality and stable performance. This sensorless vector control frequency drive is of compact structure design and made of durable components that it can meet various kinds of load challenges and application scenarios. 

1. Advanced control algorithm

AC70 vector motor control drive is developed with the latest control algorithms such as V/F, vector control without PG and PID control (what is PID control?) that it can flexibly meet multiple complicated application requirements such as fast response speed, high precision speed control, variable speed control and more. 

Without PG vector control, the torque response speed= 20ms, torque control precision ±1%, 150% rated torque under 1Hz.

PID control

Efficiency Improving

PID control

2. Wide input voltage range:

Input voltage fluctuation ±15% is allowed.

3. Prominent overload capacity

150% of rated current in 60 seconds, 180% of rated current in 10 seconds, 200% of rated current in 1 second.

4. Strong adaptability to environment

AC70 vector control frequency drive is designed with compact structure and small size that it is suitable for strict installation requirements.

Its independent air duct design and anti-corrosion paint technology empowers AC70 with strong ability to resist dust, moisture, salt mist, mold and more.

5. User-friendly design, easy to operate and maintain

Detachable DC fan ensures that whole system can work quietly and stably. It is also simple for users to clean and replace the DC fan.

Plug and play and external keypad are supported.

AC70 vector control inverter drive supports data copying function, English interface with LCD/LED display.



Items Description


Power Input

Voltage, frequency single phase 220V, 3 phase, 220V, 380V, 660V and 1140V
Allowable fluctions Voltage: ±15%; frequency±5%
Distortion of voltage to confirm to IEC61800-2
Closing striking current Less than rated current
Power Factor =0.94( integrated DC reactor)
Efficiency =96%
Power Output Output Voltage 3 Phase, 0~Input voltage, tolerance less than 5% in standard
rating condition
Frequency control range G type: 0 to 400Hz, P type: 0-400Hz, Z type: 0-400Hz, L type:
H type: 0-3000Hz.
Output frequency accuracy ±5% of maximum frequency
Overload tolerance Z type: 150% rated current for 60 sec, 180% rated current for 30
sec, 250% rated current for instantaneous
G, H, L type model: 150% of rated output current for 60 sec,180% of
rated current for 10s, 2 00% of rated current for instantaneous
P type: 120% rated current 60 sec, 150% rated current for



Key Control Performance

Motor control mode Open loop sensorless vector control without PG, V/F control
Control system Optimized Space Vector PWM Modulation
Carrier frequency 0.6~ 15kHz, Randomly-modulated carrier
Speed control range OLV without PG with rated load: 1:100,
Stable speed control accuracy OLV without PG: less than 1% rated synchronous speed
Torque response OLV without PG control mode: =20ms
Frequency accuracy Digital inputs: maximum × ±0.01%
Analog inputs: maximum × ± 0.2%
Frequency setting resolution Digital inputs: 0.01 Hz
Analog inputs: 0.5% of maximum output frequency
Standard Function DC Baking Starting Frequency: 0.00 to 50.00Hz,
Braking Time: 0.0 to 60.0s
Braking current: 0.0 to 150% rated current
Torque boost Auto torque boost:0.0% to 100%
Manual torque boost: 0.0% to 25%
V/F curve 5 kinds curve programmable setting:1 user setting, 1 of linear
characteristic torque curve setting. 3 kinds derating torque
setting( 1.5 power, 1.7 power, 2.0 Power curve )
ACC/DEC curve Two kinds curve: line Accel/Decel, S curve Accel/Decel.
4 Aceel/Decel time unit is 0.1s, maximum time 6500.0s
Rated output voltage Power voltage compensation is available, setting range from 50 to 100%( rated voltage), the output voltage can not over than input
AVR(auto voltage regulation) Automatic voltage regulation for keeping output voltage stable when fluctuation of grid
Auto energy saving running Optimized the output voltage according the load to achieve energy saving
Auto current limit Auto current limit during running mode to avoid trip occurs frequently
Momentary Power Loss with
no stop running function
To achieve continuous running with regenerative enery and DC bus
voltage regulation when momentary power loss
Standard function PID control, Carrier frequency adjustable, current limiter, Speed
Search, Momentary Power Loss restart,8 Step Speed (max), 3-wire
Sequence, Slip Compensation, Frequency Jump, Upper/lower
Limits for Frequency Reference, DC Injection Braking at Start and
Stop, Energy Saving Control, Modbus Comm RS485, Fault Restart,
job function, Cooling Fan on/off Switch, timing stop, high pulse
output, programmable auto running, swing frequency, counter,
frequency arriving detect and frequency lever detect.
Frequency Setting Methods Keypad digital setting, potentiometer of keypad, analog voltage
terminal VS1, analog voltage terminal VS2, analog current terminal
AS, RS485 communication and multiple terminal, main and auxiliary
composition setting.
Feedback Input Channel Voltage terminal VS1, VS2, current terminal AS, communication ,
and pulse input PUL
Running command channel Keypad given, external terminal given, communication given
Input command signal Start, Stop, FEW/Reverse, Job, Multiple speed, free stop, Reset,
Accel/Decel time, Frequency set point channel, External fault
Output signal 2 Photo coupler relays: 2 (24 V, up to 50 mA)
1 Contact relays: 1 (250 Vac/up to 1 A, 30 Vdc/up to 1 A)
0-10V output, 4 to 20mA output
Frequency pulse output
Protection function Overvoltage, under voltage, current limit, over current, overload,
electric thermal relay, overheat, Stall prevention, parameter lock
Keypad Display LED Display One line digit-segments LED display to monitor 1 running status;
Double line digit-segment display to monitor 1 running status.
Parameters copy Upload and download parameter code to achieve easy copy
Monitor Function Output frequency, Frequency set point, Out current, Output voltage,
motor speed, PID feedback value, PID given setting, IGBT module
temperature, I/O terminal status.
Alarms Overvoltage, under voltage, over current, short circuit, phase loss,
over load, over heat, stall prevention, current limit, parameter lock
damage, running status at present alarm, past trip alarm
Environment Installation site Indoor, Altitude should less than 1000m, Free corrosive gases and
direct sunlight
Running Temperature,
-10~+40°C ( wall mounting),
20% to 95% RH (No condensation)
Vibration Less than 0.5g when frequency less than 20Hz
Storage Temperature -25—+65°C
Installation mode Wall-mounted mode, floor stand cabinet install
Protection Degree IP20
Cooling Method