GANDO INTERNATIONAL (HONGKONG) LIMITED
Gando AC drive, everything can be under controlled
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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
Features of 303 series HVAC application
|
Features |
Benefits |
|
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. |
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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
|
Item |
Specification |
|
Input frequency |
50/60Hz |
|
Output frequency |
0-600Hz |
|
Overload current |
150% rated current 1min., 180% 2 sec. |
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Control mode |
sensor-less vector control(SVC), V/F control |
|
Starting torque |
150% 1Hz (SVC 150% 0.5Hz) |
|
Control precision |
±0.5% |
|
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. |
|
Enclosure |
IP20 |
|
Cooling mode |
forced air cooling |
|
Vibration |
Less than 0.5g |
|
Ambient temperature / Humidity |
-10 Degrees~+40 Degrees / 20~90%Rh (no condensation) |
Tips:
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.