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Certification:CE
Medium Voltage AC Drive Frequency Inverter for Water Pumps
A pump is a machine or device for raising, transferring, or compressing fluids. Pumps represent the largest single use of power in industry (31%) by motor driven equipment. Process variables, including pressure and flow of gases and liquids, have long been regulated using mechanical clutches, throttles, and adjustable inlet guide vanes. Pumps often operate as a variable torque load, a load that increases as the speed increases. These mechanisms waste energy, require frequent maintenance, and provide inaccurate control.
Pumps have two main categories:
1. Positive displacement pumps force a fixed volume of fluid from inlet to discharge with each stroke or rotation. (e.g., reciprocating, rotary, or screw type pumps)
2. Centrifugal pumps are the biggest class of pumps, which use the fluid's own momentum to build up pressure or head. Centrifugal pumps use centrifugal and hydrodynamic forces to create pressure that moves the fluid from inlet to discharge.
Pumps can also be classified by principle of operation and drive requirements.
· Principle of Operation Application Served
· Materials of Construction
· Liquid Being Pumped
· Shaft Orientation (Vertical, Horizontal)
· Number of Stages
· SuctionPortArrangement
Application Challenges
· Reduce energy costs
Motors use less energy as speed is reduced.
· Reduce demand charges
Drives reduce motor starting current 8-10 times.
·Variable and constant torque load characteristics, depending on pump type.
·The motor may spin backwards due to pump backpressure when stopped.
·Control of pressure and flow is desired.
·High reliability.
·Wide horsepower range for different pump sizes.
·Environmentally friendly (harmonic standards).
·Network communications.
·Prevention of water hammer, pipe stress, valve, and pump seals and cavitation prevention.
Features of G11 matching extruder 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. |
|
Overtorque Detection |
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 material. |
|
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: 1140VAC (959VAC – 1311VAC)
Power: 45kw/60HP – 400kw/535HP
Specification of G11 VFD
|
Item |
Specification |
|
Input frequency |
50/60Hz |
|
Output frequency |
0-400Hz |
|
Overload current |
150% rated current 1min., 180% 10 sec. |
|
Control mode |
sensor-less vector control, V/F control |
|
Starting torque |
150% 0.5Hz |
|
Control precision |
±0.2% |
|
Torque precision |
±5% |
|
Setting frequency menthod |
Plastic Extruder Machines, multi-step speed, simple PLC and PID. |
|
Output frequency resolution |
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