400KW AC Variable Voltage Variable Frequency Inverter Drives for
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
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
- Principle of Operation Application Served
- Materials of Construction
- Liquid Being Pumped
- Shaft Orientation (Vertical, Horizontal)
- Number of Stages
· 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
· The motor may spin backwards due to pump backpressure when
· 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
Features of P5 series cooling tower Water Pump application
Dual digital tube
Double lines of LED display, monitoring 2 kinds of information
meantime, like frequency, current, voltage, speed and PID data.
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.
Multiple control terminal, 6 DI, 4 DO, 2 AI, 4 AO, RS-485 support
Power range of P5 VFD
Voltage: 3 phase 380VAC(323VAC – 440VAC)
Power: 18.5kw/25HP – 400kw/535HP
Specification of P5 VFD
120% rated current 1min., 130% 6 sec.
125% with additional brake resistor
Set frequency resolution
digital command 0.01Hz;
analogue command 0.1Hz/60Hz
34 fixed V/F features selectable, any V/F features can be set
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
Over voltage, under voltage, current limit, over current, overload,
electronic thermal relay, overheat, over voltage stalling, data
protection, under load precaution, loaded short circuit
forced air cooling
Less than 0.5g
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.