660V Medium Voltage Variable Frequency Converter Drives for Blowers
Blowers are widely used in cement, textile and steel plants. We
take the blowers in clean room for example.
A clean room is virtually dust and/or bacteria free. Clean rooms
are used in laboratory work and in assembly or repair of precision
equipment. A clean room fan supplies clean air through ventilation
systems. This fan runs a system that filters exterior air,
maintains temperature and humidity at constant levels, and
circulates the interior air through a high-performance air filter
while expelling part of the interior air.
Application Challenges
·Maintain positive pressure in the clean room.
·Maintain a high quality filtering system at all times.
·Avoid mechanical resonance in the surrounding equipment.
·Detect clogged fans or air ducts automatically.
Features of G11 matching blower application
Features | Benefits |
Open Loop Vector and V/Hz Control with Torque Compensation | Provides excellent breakaway torque for thick materials and
constant torque to maintain mixing speeds under heavy loads. |
Preset frequency reference | Preset mixing patterns can be established for different materials. |
Auto-Restart after momentary power loss | Mixing can quickly restart after fault or momentary power loss.
This keeps perishable foods from spoiling in process. |
Power loss Ride-Through | The mixing process in not interrupted during brief power loss (<
5 ms). |
Power range of G11 VFD
Voltage: 660VAC (450VAC – 690VAC)
Power: 22kw/30HP – 400kw/535HP
Specification of G11 VFD
Item | Specification |
Input frequency | 50/60Hz |
Output frequency | 0-400Hz |
Overload current | 150% rated current 1min. |
Control mode | Close-loop vector control, sensor-less vector control, V/F control |
Starting torque | 150% 1hz (with PG 0hz) |
Control precision | ±0.2% (With PG ±0.02%) |
Torque precision | ±5% |
Setting frequency resolution | Digital command 0.01hz; analog command 0.03hz/60hz |
Output frequency resolution | 0.01Hz |
Frequency setting signal | -10V~+10V；0~+10V(20kΩ)；4~20mA |
Protection function | Over voltage, under voltage, over load, relay, overheat speed
stall, grounding, instant power cut compensation( within 2 sec for
operation mode. Continue to operate after the power is available),
Charging protection( not to display when the dc voltage of main
circuit is less than 50v) |
Enclosure | IP20 |
Cooling mode | forced air cooling |
Vibration | Less than 0.2g for 20hz |
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.
