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.
·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
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 (<
Power range of G11 VFD
Voltage: 660VAC (450VAC – 690VAC)
Power: 22kw/30HP – 400kw/535HP
Specification of G11 VFD
150% rated current 1min.
Close-loop vector control,
sensor-less vector control, V/F control
150% 1hz (with PG 0hz)
±0.2% (With PG ±0.02%)
Setting frequency resolution
Digital command 0.01hz; analog command 0.03hz/60hz
Output frequency resolution
Frequency setting signal
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)
forced air cooling
Less than 0.2g for 20hz
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.