Variable Frequency Inverter VFD Converter Drives for Fans and Pumps
P5 series is a special for fans and pumps type VFD. So we’d better
give a brief introduction on the fans and pumps energy saving
In a variety of industrial fans, pumps, such as boiler drum, Fan,
deep well, pump, etc., most of rated power. The maximum design flow
fan air volume requirements are to design, the adjustment method
using baffle, damper, the return of control from the power
machines, etc., can not form a closed loop control, and rarely
consider the power; pump design flow for the maximum flow of the
same and pressure regulation by the size of the valve can only
control the motor start and stop other methods. Electrical control,
directly or Y △ start with, can not change the motor speed, not a
soft-start function, mechanical impact of large, life is short
drive, vibration and noise, power factor is low.
The frequency control of the saving significance Frequency is the
rise in recent years, a new technology, which is achieved by
varying the speed of power frequency regulation, because of its
speed steady, transient stability, energy-saving features has been
growing attention. With the frequency control technology continues
to mature, and Frequency Control in the fan and water pump devices
are increasingly being used on the application. Direct control by
the drive fan, pump load control is one of the most scientific
method. PID adjustment software built using the inverter, which
directly regulates the motor speed to maintain constant water
pressure, air pressure, the pressure to meet system requirements.
As the drive motor can achieve a large soft-stop, soft play, to
avoid the start of the voltage surge can reduce the failure rate of
the motor, long life, but also reduces the capacity requirements on
the grid and the reactive power loss, equipment operating
significantly improved the status of security of the system
improved reliability and equipment utilization, energy-saving
effect is very significant.
The principle frequency speed fan and water pump We can see through
the basic laws of fluid mechanics: fans, pumps equipment are square
torque load, the speed n and the flow rate Q, pressure H and the
shaft power P have the following relations: Qαn1, Hαn2, Pαn3; that
, is proportional to flow and speed, pressure and speed
proportional to the square shaft power and speed proportional to
the cube. Q2 = Q1 (n2/n1) H2 = H1 (n2/n1) P2 = P1 (n2/n1) Thus,
ideally we have the following relationship data:
From the above table shows: when the demand flow rate drops, adjust
the speed can save a lot of energy. For example: When the motor is
running 80% of the rated speed, the theoretical power consumption
of its rated power (80%), or 51.2%, removal of mechanical wear and
tear, electrical copper, iron loss and other effects, energy
efficiency close to 40%, but can also achieve closed-loop constant
pressure control, energy efficiency will be further enhanced. Such
as the use of traditional baffle, valve means regulation, though it
may be appropriate to reduce energy consumption, but saving effect
compared with the frequency, there are different.
P5 series fan pump frequency functions and features related to
- Use of inverter control motor speed, cancel baffle, valve
adjustment, reduced the failure rate of equipment, energy-saving
effect is remarkable.
- Achieve soft start the motor, extending the service life of
equipment, avoiding the impact on power.
- Less than the rated speed of the motor will run the state, reduce
the noise impact on the environment.
- Overload, over voltage, over current, voltage, power phase loss
protection function automatically.
- Flexible operating conditions, you can manually control the
automatic control can be fully realized, and the other controlled
device with the electrical device chain, to achieve the automatic
protection equipment, and computer control, the accident will not
- Do not destroy the original installation of distribution facilities
and the environment, does not affect production.
- Just adjust the potentiometer knob to adjust the flow rate, easy to
operate. Fans, pumps and other equipment using frequency control
technology to achieve energy-saving operation is a priority for the
promotion of energy saving technologies, "Energy Conservation Law"
Article 39 of the General to put it as a promotion. Practice shows
that the drive for fans, pumps device driver control applications
have made significant energy-saving effect, is an ideal speed
control. Not only improves the device efficiency, but also meets
the requirements of the production process, and greatly reduces the
maintenance, repair costs, but also reduces the shutdown period.
Direct and indirect economic benefits are clear, equipment is
usually one-time investment in the 9 months to 16 months in the
production of fully recovered.
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.