GANDO INTERNATIONAL (HONGKONG) LIMITED
Gando AC drive, everything can be under controlled
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400KW AC Variable Voltage Variable Frequency Inverter Drives for Water Pump
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.
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 P5 series cooling tower Water Pump application
|
Features |
Benefits |
|
Dual digital tube |
Double lines of LED display, monitoring 2 kinds of information meantime, like frequency, current, voltage, speed and PID data. |
|
Smart restart |
Instant power off continue running and speed tracking |
|
S curve acceleration/deceleration mode |
S curve acceleration/deceleration can reduce impact to the machine at start/stop time, and suitable for the start/stop process for loads of handling and transmission categories. |
|
Terminal control |
Multiple control terminal, 6 DI, 4 DO, 2 AI, 4 AO, RS-485 support Modbus |
Power range of P5 VFD
Voltage: 3 phase 380VAC(323VAC – 440VAC)
Power: 18.5kw/25HP – 400kw/535HP
Specification of P5 VFD
|
Item |
Specification |
|
Input frequency |
50/60Hz |
|
Output frequency |
0-120Hz |
|
Overload current |
120% rated current 1min., 130% 6 sec. |
|
Control mode |
V/F control |
|
Brake torque |
125% with additional brake resistor |
|
Set frequency resolution |
digital command 0.01Hz; analogue command 0.1Hz/60Hz |
|
Voltage/Frequency feature |
34 fixed V/F features selectable, any V/F features can be set |
|
Running Mode |
Keyboard, control terminal, RS485 |
|
Output Voltage self-adjustment |
When AVR function is enabled, the input voltage changes, while the output voltage almost remains unchanged |
|
Frequency setting signal |
0-10V, 0-5V, 4-20mA, 0-20mA |
|
Protection function |
Over voltage, under voltage, current limit, over current, overload, electronic thermal relay, overheat, over voltage stalling, data protection, under load precaution, loaded short circuit |
|
Enclosure |
IP10 |
|
Cooling mode |
forced air cooling |
|
Vibration |
Less than 0.5g |
|
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.