Medium Voltage AC VFD Drives for Plastic Extruder Machines
Extrusion machines are used to create product by forcing raw
material, such as plastic, through a die. Extruders are used to
create a wide range of products such as tubing, sheet goods, and
insulation. Food processing is a popular application for extruders.
Extruders employ a main drive motor to supply power to a screw,
which provides the force necessary to push the raw material through
- Replace hydraulically operated or DC powered drives
- Precise speed control while material is being extruded
- Develop high torque at very low speeds
Features of G7 matching extruder 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.
Provides early warning of damaging torque levels as a result of
seizing mixer blades.
Torque Reference programmable to an analog output
The applied mixing torque is fine tuned or adjustable for different
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 G7 VFD
Voltage: 660VAC (450VAC – 690VAC)
Power: 22kw/30HP – 400kw/535HP
Specification of G7 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.