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Variable Speed Controls Sensorless Vector Drive for HVAC with Low Noise

Variable Speed Controls Sensorless Vector Drive for HVAC with Low Noise

Place of Origin : China
Brand Name : GANDO
Model Number : 380V-303-__KW
Certification : CE
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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Variable Speed Controls Sensorless Vector Drive for HVAC with Low Noise

Take central air conditioning system for example.
Central air conditioning system consists of chillers, cooling systems, chilled water system, cooling tower fan coil system and the composition of the chiller refrigerant compressed by the compressor into the liquid evacuation evaporator heat exchange with chilled water, chilled water cooling, chilled water pump chilled water to each fan coil cooling wind, the cold air from the fan blowing up cooling purposes. The evaporated refrigerant in the condenser releases heat, and cooling circulating water heat exchange, heat from the cooling water pump will bring the cooling water pump to the cooling tower of its conduct by the spray cooling tower fans, and between the atmosphere heat exchanger, the heat emitted to the atmosphere.

Application Challenges

  • Quick response
  • Low noise
  • Terminals control

Features of 303 series HVAC 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.

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.

Product Tags:

ac induction motor


variable speed controls


vector controller

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