Wilo frequency converter. Pumps with a frequency converter are whistling - we find the reason. Why does a Wilo pump with a frequency converter whistle? Causes

Installation instructions and Wilo operation-CC-System

Frequency converter:: Converter
frequency for speed control
base pump depending on load
Available only on COR units (Pos. 4)

Motor protection filter: Filter for
providing sinusoidal voltage
motor and voltage peak suppression
Available only on COR units (Pos. 5)

Fuse for drives and
frequency converter: Fuse
pump motor and frequency converter.
For devices with P

≤ 4.0 kW: protective

automatic electric motor. (Pos. 6)

Relay/relay combination: Relay for
pump connections. For installations with
P2 ≥ 5.5 kW incl. thermal relay For
overcurrent shutdown (Set
variable: 0.58 * I

) or delay relay

for switching from star to delta
(Pos. 7)

Manual/0/automatic switch:
Switch for selecting operating mode
pump: “manual” (emergency/test mode
power supply operation; protective relay
electric motor), “0” (pump off,
connection via programmable
controller is impossible) and “automatic”
(the pump is automatically controlled by
programmable controller) (Pos. 8)

6.1.3 Methods of operating the installation

control with frequency converter
(see Fig. 3)
Electronic pressure sensor (range
measurements are determined in the menu item
3.3.2.4) converts pressure into current
signal 4 - 20 mA. Based on these data,
The regulator maintains the installation pressure at
constant value by means of comparison
set and current pressure (more than
details about installing the main preset
values➄ see menu item 3.3.2.1). If not
external trip messages and
damage to the installation, it turns on
variable frequency main pump
rotation depending on water consumption.
If the pump does not provide the required
supply, then the control system connects
one or more peak load pumps.
Peak load pumps operate with
constant speed, frequency

rotation of the main pump is adjusted according to
according to the set value➆.
If water consumption decreases and
adjustable pump operates at minimum
power, then the need to use
There are no more additional pumps. Then
The peak load pump is switched off. At
zero flow main pump automatically
turns off. If the pressure drops below
maximum permissible value, then
the installation is turned on again.
Settings required for
turning on and off peak pumps
load (switching level ➇/➈; time
delay), can be set at
menu 3.3.3.2.
To prevent pressure surges during
connecting or disconnecting pumps
peak load, it is necessary to reduce
or, accordingly, increase the number
revolutions of the main pump during
switching Peak detection
values in the “Peak Value Filter” via
the menu is described in paragraph 3.3.5 (page 2).

Normal operating mode of devices
control without frequency converter
(see Figure 4)
For control devices without
frequency converter (powered by
network) or with a broken converter
frequency, adjustable variable also
determined by comparing the given and
current value. Because it's impossible
adjust the main rotation speed
pump depending on the load, then installation
works as a two-position regulator
between ➃ and ➄ / ➅
Connecting and disconnecting peak pumps
loads described above.
To turn off the main pump at the point
menu 3.3.3.1 you can set a special
threshold value for shutdown ➅.

No load shutdown
When using only one pump,
operating at minimum frequency
rotation, performed every 60 seconds
zero flow check, during which
the pressure increases slightly for 5 seconds
installations. If after resetting the higher
pressure does not decrease to the set value, then

Components (see Figure 2)

Using

use

1-3 pumps

4-5 pumps

6 pumps

1-6 pumps

CPU

Analog module 2E/1A

Digital module 4E/4A

Digital module 8E/8A

COM interface

Pump type: multistage, submersible. Used for pumping water from containers, wells, and irrigation.

Advantages of the Wilo pump

greater productivity (due to the speed of 8400 rpm);
the motor can be rewound;
reverse valve;
parts made of stainless alloys (including frequency converter, built-in);
installation versatility;

Technical data:

type – submersible;
power supply: 1-phase, 230 volts, 50 hertz, ;
1-phase, 230 volts, 50 hertz, connection without frequency converter;
operating mode in immersion: S1;
water temperature: from 3 to 35 degrees;
lowest flow speed: 0.08 meters per second;
highest sand content: 50 grams per m 3;
greatest number starts: 30 per hour;
greatest depth: 150 meters;
degree of protection: IP 58;
pressure connection: Rp 1.

Frequency converter for pump:

connection network: 1-phase, voltage 230 volts, 50-60 hertz;
output parameters: 3-230 volts max, 140 hertz max, power 2.2 kilowatts;
water temperature: from 3 to 50 degrees;
highest pressure: 8 atmospheres;
degree of protection: IP X5;
connecting dimensions: 1 ¼ inches.

Why does a Wilo pump with a frequency converter whistle? Causes.

I installed a used electric motor with a power of 2.2 kilowatts, 140 rpm. The motor is powered via frequency Wilo converter. Engine operation is normal, but there is a strong whistle throughout the entire rev range. I thought it was the bearings. I took it apart, everything is new, no problems are visible. Bearings closed type, easy to rotate, not hot. The covers have washers. It is not clear what the reason for the whistling is.

Subsequently, I found out that the reason for the whistling of the Wilo pump is the occurrence of high-frequency harmonics created by the inverter. You can get rid of the whistling by installing another frequency converter. The whistling is more pronounced in a motor with a double cage and a wide rotor wire. Whistling when the converter operates is normal. The winding whistles. The shape of the potential has a specific shape, similar to a rectangular one, with a varying duty cycle. This means that the motor winding receives a positive potential of different durations and a negative potential of different durations. This adds up to the carrier frequency. The pulse width varies sinusically using a discrete method. A person hears a whistle of a carrier frequency of about 4 kilohertz.

To reduce noise (whistle), you can cover the motor drive with sound insulation. In this case, it is necessary to remove heat to prevent overheating.

Pump stations operating in automatic mode with a frequency converter.

The stations serve to provide clean water pressure constant value without mechanical inclusions, chemical substances. The frequency converter gently changes the engine speed and creates pressure in the water supply system. This does not depend on consumption, saves electricity, increases productivity, protects the engine and pump from operation without water, and increases service life.

The pumping station consists of a pump with an engine, a frequency generator, and a hydraulic accumulator. The frequency control is taken over by a sensor that is built into the pump pressure pipe.

Design features.

Air temperature: +1 +40 degrees C.
Highest air humidity: 50% at +40 degrees C, without condensation.
Degree of protection: IP-54.
Fluid temperature for pumping: +1 +40 degrees C.
Type of liquid for pumping: water without solid suspensions, aggressive and chemical substances.
The engine power is rated at 2.2 kilowatts.
Frequency switch input voltage: 100-244 volts, pump: 200-440 volts.
The output voltage of the frequency converter depends on the input potential and motor data.
Output frequency: from 0 to 55 hertz.
Rated current at the input of the frequency converter: 11 amperes for IMTP, 6.5 amperes for ITTP.
Rated current at the output of the frequency generator: 10 amperes for IMTP, 6 amperes for ITTP.

Pumping station: centrifugal pump with asynchronous motor, frequency switch, pressure sensor, hydraulic accumulator, wires, fittings, connections, pressure gauge.

The pump is the main link of the pumping station.
The hydraulic accumulator is used for normal operation of the pressure sensor, increasing the volume clean water, changing the amount of starting and braking of the pump, for attaching the pump.
The inverter is designed to start and brake the engine, controls the pump drive, and protects the motor. The motor rotation speed is adjusted by changing the current frequency and motor potential. The inverter is fixed to the installation location of the box for the pump motor contacts. The heat from the frequency converter is removed by a fan.
The five-piece is used for easy and convenient installation of a pressure sensor, hose and pressure gauge.
The hose is designed to connect from the hydraulic accumulator to the pumping mechanism.
A pressure gauge is needed to control the pressure at the moment of switching off and starting the station.
The cables are used to connect the frequency transmitter to the power supply and pressure sensor.

Installation, connection of wires, cables, configuration.

Select before installation right place. Pumping station It is recommended to install in a pit. Can be installed in the basement, on a flat surface, ventilated, dry place. The station can be connected directly to the water supply network or to a container of water. Make sure that the pressure in the water supply network and the highest pump pressure are not more pressure operation of the hydraulic accumulator and pump.

On the pressure and suction pipeline in front of the pump station, it is necessary to install shut-off valves and connecting connectors for repairs and removal

Designation

For example,	Wilo-Sub TWU 3-0305-HS-E-CP
TWU	Submersible pump
3	Diameter of hydraulic equipment in inches ["]
03	Nominal volume flow [m 3 /h]
05	Number of hydraulic sections
H.S.	High Speed version
E	Frequency converter version E = external frequency converter I = internal frequency converter
C.P.	Regulation function CP = constant pressure maintenance without = fixed frequency rotation up to 8400 rpm

Product Features/Benefits

Increased productivity due to increased rotation speed (up to 8400 rpm)
Rewindable motor
Built-in check valve
Parts in contact with the pumped medium made of corrosion-resistant material
Including frequency converter (HS-E...: external, installed in the pipeline; HS-I...: integrated in the motor)
Vertical and horizontal installation possible

Specifications

Submersible pump:

Supply voltage:
HS-E...: single-phase network, 230 V, 50/60 Hz (mains connection alternating current via frequency converter)
HS-I…: single-phase network, 230 V, 50/60 Hz (direct connection to AC mains)
Immersion mode: S1
Pumped liquid temperature: 3-35 °C
Minimum current on the motor: 0.08 m/s
Max. sand content: 50 g/m3
Max. number of starts: 30/h
Max. diving depth 150 m
Protection class: IP 58
Pressure connection: Rp 1

Frequency converter for version “HS-E...”:

Network connection: single-phase network, 230 V, 50/60 Hz
Output: 3~230V/max.140Hz/max. 2.2 kW
Pumped liquid temperature: 3-50 °C
Max. pressure: 8 bar
Protection class: IP X5
Joint: G 1¼

Equipment/functions

Multistage submersible pump with radial impellers
Built-in check valve
Including frequency converter (HS-E...: external, HS-I...: built-in)
Thermal motor relay is built into the frequency converter

Materials

Frame hydraulic system: stainless steel 1.4301
Impellers: polycarbonate
Hydraulic shaft: stainless steel 1.4104
Motor housing: stainless steel 1.4301
Motor shaft: stainless steel 1.4305

Description/design

Submersible pump for vertical or horizontal installation.

Hydraulics

Multistage submersible pump with radial impellers in a sectional design. Built-in check valve. All parts in contact with the pumped medium are made of corrosion-resistant material.

Non-corrosive asynchronous motor for connection to the included frequency converter (HS-E...) or for direct connection to electrical network(HS-I...). Oil-filled, rewindable motor with self-lubricating bearings, designed for high speeds up to 8400 rpm.

External frequency converter or motor-integrated frequency converter for operating pump speeds up to 8400 rpm, including the following functions:

Smooth start
protection against undervoltage, overvoltage and short circuit;
Protection of the motor and frequency converter from overload using a thermal relay

Model "HS-E..." with external frequency converter has the following additional equipment features:

Prevention of frequent switching cycles (synchronization) by monitoring tightness;
Dry running protection with automatic reset
changing the direction of rotation;
Setting max. current and set pressure
pressure indication on the display.
Settings, operating status indications and error messages are shown via LEDs or on the display.

The frequency converter must always be installed outside the pumped medium with protection against flooding!

Control function "CP": Constant pressure

Thanks to operation with a frequency converter, the rotation speed of the unit is automatically adjusted to the current water flow. Thanks to this, the submersible pump always supplies constant pressure.

Cooling

The motor is cooled by the pumped liquid. Operation of the engine is only permitted when immersed. The maximum limit values must be observed. temperature of the pumped medium and its minimum flow rate.

For vertical installation, it is necessary to provide a cooling jacket depending on the diameter of the well. Horizontal installation always performed with a cooling jacket.

Cooling of the external frequency converter also occurs due to the pumped medium. To do this, the frequency converter must be installed directly into the pipeline outside the pumped medium (with protection against flooding).

Defining parameters

Suction mode is not possible for these units!
The unit must be completely submerged in water during operation!
An adapter for converting from Rp 1 to G 1¼ is required for installation. It must be provided by the customer!

Scope of delivery

Hydraulics complete with motor
Frequency converter (FC)
Connection cable 1.75 m long and approved for use in drinking water supply(cross section: 4x1.5mm2)
Installation and operating instructions

Options

Special length cables on request

Approval for the use of WILO pumps and installations |
Certificate of state registration of WILO products in countries Customs Union |
Certificate of conformity for Wilo products |