GANDO INTERNATIONAL (HONGKONG) LIMITED
Gando AC drive, everything can be under controlled
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AC Variable Frequency Inverter Drives VFD for Screw Feeder 400V
Screw feeders are used in various industries for the metering of material into a production process. Screw feeder design closely resembles that of a screw conveyor, but unlike a screw conveyor, a screw feeder is required to be very precise and accurate. The screw in a screw feeder is completely filled with material, compared to a screw conveyor which is typically 40-50% filled. That is part of the reason the material is accurately discharged when the feeder screw is rotating at a controlled rate.
Application Challenges
· Fast Response
Capable of accurately regulating material feed.
· Load Detection
Capable of detecting an overload or no material in the screw situation.
· Speed Range
Be able to provide the required amount of torque throughout the speed range.
· Trip-less Operation
The product must be capable of continuing to operate after a momentary power loss or a fault.
Features of G7 matching feeder application
|
Features |
Benefits |
|
Open Loop and Closed Loop Flux Vector Motor Control |
Excellent speed stability and low speed torque production is possible due to Flux Vector Control technology. |
|
Overtorque and Undertorque Detection |
Both the Overtorque and the Undertorque Detection functions can sense if there is an overloaded feeder or lack of material. |
|
PID |
Accurate and quick response control of material into the production process |
|
Auto-Restart after momentary power loss. |
Feeders can quickly restart after fault or momentary power loss. |
|
Power loss Ride-Through |
The material feed is not interrupted during brief power loss. |
|
Torque Limit |
Use of Torque Limit can prevent screw or gear damage due to excessive torque from foreign material in the load. |
Power range of G7 VFD
Voltage: 400VAC (380VAC – 460VAC)
Power: 22kw/30HP – 1000kw/1250HP
Specification of G7 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.