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Keyboard, control terminal Constant speed control AC sensorless vector drive for

Keyboard, control terminal Constant speed control AC sensorless vector drive for

Place of Origin : China
Brand Name : GANDO
Certification : CE
Model Number : 380V-303-__KW
MOQ : 1 set
Delivery Time : 2 days
Payment Terms : TT, L/C, Western Union, Paypa
Supply Ability : 200 sets per week
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AC Sensorless Vector Control of Induction Motor Drive for Escalator

Escalators are widely used in shopping malls, super markets, and other public buildings. The main motor keep running at low or even zero speed while no user on, and once user coming is detected, repaid and smooth start should be taken action. In this way, the equipments save normally up to 80% of energy, compare to constant speed system.

Application Challenges

  • Quick response
  • Smooth acceleration and decelerate
  • Constant speed control

Features of 303 series escalator application



flexible input methods

1. Speed input-Take running speed of the motor as the control objective

Speed input consists of the main speed input, auxiliary speed input and inching speed input, etc. The actual effective combined speed input can be either of the three or the combination of either of the two.

2. Torque input-Take output torque of the motor as the control objective

Set output torque of the motor directly, particularly suited to application fields requiring tension control.

Terminal-Peripheral equipment control

Control start/stop with the contact or button to simply realize the automation control of the entire equipment system.

Vector control 0

Real time estimates speed information of the motor only, without feedback control, real-time closed-loop control of the current all the way, 0.50 Hz outputs rated torque of up to 150%, track load change and limit output current automatically to make it not exceed the permitted maximum current value.No overcurrent error even if load mutation, rapid acceleration and deceleration to realize high performance and high reliability configuration of the universal Inverter.

Vector control 1

Not only real time estimates speed information of the motor, but also conduct feedback control, real-time closed-loop control of both the speed and current all the way, which can realize not only speed control but also torque control, and can translate universal AC induction motor into AC speed regulation motor and AC torque motor by adopting such kind of drive mode. This is a real vector control Inverter without external speed sensor.

S curve acceleration/deceleration mode

S curve acceleration/deceleration can reduce impact to the machine at start/stop time, and suitable for the start/stop process for loads of handling and transmission categories.

Power range of 303 VFD

Voltage: 3 phase 380VAC(304VAC – 460VAC)

Power: 0.75kw/1HP – 400kw/535HP

Specification of 303 VFD



Input frequency


Output frequency


Overload current

150% rated current 1min., 180% 2 sec.

Control mode

sensor-less vector control(SVC), V/F control

Starting torque

150% 1Hz (SVC 150% 0.5Hz)

Control precision


Given Frequency Resolution

Digital given: 0.01Hz, analog given: 0.05Hz

Running Mode

Keyboard, control terminal (two-line control, three-line control), RS485

Output Voltage self-adjustment

When AVR function is enabled, the input voltage changes, while the output voltage almost remains unchanged

Frequency setting signal

0~+10V; 0~20mA;

Protection function

Short circuit, overcurrent, overload, overvoltage, undervoltage, default phase, overheating, and external fault, etc.



Cooling mode

forced air cooling


Less than 0.5g

Ambient temperature / Humidity

-10 Degrees~+40 Degrees / 20~90%Rh (no condensation)


A variable-frequency drive (VFD) is a system for controlling the rotational speed of an alternating current (AC) electric motor by controlling the frequency of the electrical power supplied to the motor. A variable frequency drive is a specific type of adjustable-speed drive. Variable-frequency drives are also known as adjustable-frequency drives (AFD), variable-speed drives (VSD), AC drives, microdrives or inverter drives. Since the voltage is varied along with frequency, these are sometimes also called VVVF (variable voltage variable frequency) drives.

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