FLOWTECH flowcon User manual

1
First Publication Date: 01/09/2020
Revision:
Revision Date:
OPERATION AND
MAINTENANCE MANUAL
VSD - F Inverter
flow con
©

CONTENTS
OPERATION & MAINTENANCE
General Information 3
Safety Information 4
Safety Warnings & Precautions 5
Customer / Contractor Responsibilities 6
Authorised operators 7
Warranty 7
Technical assistance 7
Technical description 7
Intended use 7
Improper use 7
Technical features 8
Operating conditions 8
Product overview 9
Pushbuons functions 9
Interface 10
System icons 10
Display area 11
Operating icons 11
Safety 12
Transport and handling 13
Installation 13
Electrical connection 13
Power supply connection 14
Transducers connection. 14
Float switch connection 15
Cascade mode connection 15
Programming guide 16
Programming parameters 17
Operating mode programming 18
Starting pump 28
Vessel pressure 29
Use of megaohmeter 29
Maintenance 29
Disposal 29
Parameters UP – user parameters 31
Parameter AP – Advanced parameters 31
Parameter SA – service assistance seings 34
Parameter PC – Pressure constant seings 34
Parameter PP – Proportional pressure seings 35
Parameter tC – Constant temperature seing 36
Parameter CF – Constant flow rate seings 36
Parameter MAn – Fixed speed pump seings 36
Alarms 37
Troubleshooting chart 38
2

Definitions of Safety Warnings and
Precautions
WARNING!
Indicates a potentially hazardous situation which, if
not avoided, can result in serious injury or death.
 CAUTION!
Indicates a potentially hazardous situation which, if
not avoided. Can result in minor to moderate injury, or
serious damage to the product.
General
Information
These instructions are to assist in the installation of the flowcon VSD - F Inverter please follow
them carefully.
If, having read this Operation & Maintenance Manual, there is any doubt about any aspect of
the installation please don't hesitate to contact our technical team.
flowcon VSD - F Inverter
3

Safety
Information
It is essential that correct and safe working practices are adhered to at all times when installing,
operating and/or maintaining any piece of equipment. Always consult safety data sheets, operating
and maintenance manuals, Health & Safety legislation and recommendations and specific
requirements of any equipment manufacturer, site controller, building manager or any other persons
or organisation relating to the procurement, installation, operation and/or maintenance of any piece
of equipment associated or in conjunction with any product provided by flowech Water Solutions.
This document is intended for ALL installers, operators, users and persons carrying out maintenance
of this equipment and must be kept with the equipment, for the life of the equipment and made
available to all persons at all times. Prior to carrying out any work associated with the set it is essential
that the following sheets are read, fully understood and adhered to at all times.
Equipment must only be installed, operated, used, and/or maintained by a competent person. A
competent person is someone who is technically competent and familiar with all safety practices
and all of the hazards involved.
Any damage caused to any equipment by misapplication, mishandling or misuse could lead to risk of
Electrocution, Burns, Fire, Flooding, death or injury to people and/or damage to property dependent
upon the circumstances involved. flowech Water Solutions accepts no responsibility or liability for
any damage, losses, injury, fatalities or consequences of any kind due to misapplication, mishandling
or misuse of any equipment, or as a result of failure to comply with this manual.
Failure to install, operate, use or maintain the equipment in accordance with the information contained
within this document could cause damage to the equipment and any other equipment subsequently
connected to it, invalidating any warranties provided by flowech Water Solutions to the buyer.
4

Safety Warnings &
Precautions
These instructions should be read and clearly understood before working on the system. Please
read this manual carefully and all of the warning signs aached before installing or operating the
equipment keep this manual handy for your reference. This equipment should be installed, adjusted
and serviced by trained and qualified personnel. Failure to observe this precaution could result in
bodily injury.
WARNING! - Install an emergency stop key separately from the isolator. Rotating
shas can be hazardous.
WARNING! - This equipment has a high leakage current and must be permanently
fixed to earth.
WARNING! - Do not aach or remove wiring or connectors when the power is applied.
Do not check signals during operation. When the power is turned on and the running
command is on, the motor will start rotating. The stop key is only eective when the
function is set. If there is a power failure and an operation instruction is given the unit
may start automatically when the power is reinstated.
WARNING! - Make sure that the input voltage is correct. Be sure to install the unit in
a room that is not exposed to direct sunlight and is well ventilated.
Avoid environments which have a high ambient temperature, high humidity or
excessive condensation. Avoid dust. Corrosive gas, explosive gas, inflammable gas,
grinding-fluid mist and salt damage, etc.
WARNING! - Do not connect the power source to any terminals except power
connectors.
WARNING! - Motor control equipment and electronic controllers are connected to
hazardous line voltages. When servicing drives and electronic controllers, you may be
exposed to components at or above the line potential. Extreme care should he taken
to protect against shock. Dangerous voltage may exist aer the power light is o.
Wait more than 5 minutes aer turning o the power supply before performing
maintenance or inspection. Hazard of electric shock. Disconnect incoming power
before working on this unit.
WARNING! - The inverter should be protected separately against ground fault.
Observe the regional regulations for electrical installation!
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flowcon VSD - F Inverter
5

Customer / Contractor
RESPONSIBILITIES
It is the responsibility of the customer and/or the contractor:
• To ensure that anyone working on the equipment is wearing all necessary protective gear
and/or clothing.
• Is aware of appropriate health & safety warnings.
• Has read the information in this section of the manual.
CAUTION! - It is strongly recommended that all electrical equipment conforms
to National Electrical Codes and local regulations. Only qualified personnel should
perform installation, alignment and maintenance. The manufacturer reserves the right
to alter the technical data in order to make improvements or update information.
CAUTION! - Failure to observe these rules will render the guarantee invalid. The same
applies to repair jobs and/or replacement. Your legal rights are not aected.
CAUTION! - The manufacturer declines all responsibility in the event of damage or
injury caused as a result of tampering with the equipment.
CAUTION! - Do not switch on/o power supply to run/stop the motor/system! Start
the unit only by using run buon or external run command.



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6

flowcon VSD - F Inverter
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Authorised operators
The product is intended for use by expert operators divided into end users and specialised technicians (see
the symbols above).
It’s forbidden, for the end user, carry out operations which must be done only by specialized technicians. The
manufacturer declines any liability for damage related to the non-compliance of this warning.
Warranty
For the product warranty refer to the general terms and conditions of sale.
The warranty covers only the replacement and the repair of the defective parts of the goods (recognized by
the manufacturer).
The Warranty will not be considered in the following cases:
- Whenever the use of the device does not conform to the instructions and information described in
this manual.
- In case of changes or variations made without authorization of the manufacturer.
- In case of technical interventions executed by a non-authorized personnel.
- In case of failing to carry out adequate maintenance.
Technical assistance
Any further information about the documentation, technical assistance and spare parts, shall be requested
from: Flowtech Water Solutions Ltd.
Technical description
Flowcon VSD - F Inverter is a frequency converter that could be mounted in a control box or on a motor.
The frequency converter is manufactured in accordance to EN61800-3:2005-07 acc. EN55011 limit B until a
7,5 kW, limit A1 until a 55kW.
Intended use
The frequency converter is made for pumps with three-phase motor, in domestic, civil and industrial systems.
Improper use
The device is designed and built only for the purpose described.
Improper use of the device is forbidden, as is use under conditions other than those indicated in these
instructions.
Improper use of the product reduces the safety and the eciency of the device, Flowtech shall not be
responsible for failure or accident due to improper use.

8
Technical features
Supply voltage: 3~380 VAC-10% ÷ 3~480 VAC+5%
IP protection: IP55
Liquid Crystal Display
Keyboards: 6 pushbuons
Digital input:
- 2 Float switches
- MAX/min curve enable
- 2nd set-point enable
- Remote On/o control
Analog input:
- Primary transducer
- Secondary transducer
Digital output: Up to 3 alarm output or Start/stop signal
Analog output: Remote parameter monitor
Connectivity: RS485 (optional)
Protections:
- Supply voltage failure.
- Current protection.
- Output Phases Short-circuit failure
- Electronic card over-temperature.
- Unbalanced / Missing phase.
- Primary sensor missing.
- Dry-run protection (only in Constant pressure mode and Proportional pressure mode).
- Hydraulic losses detection (only in Constant pressure mode).
Operating conditions
The product works properly only if the followings conditions are respected.
- Floating voltage rate: +/-10% max
- Floating frequency rate: 50-60 Hz +/-2%
- Ambient temperature: -10°C a +50°C
- Relative Humidity: from 20 to 90% without condensing
- Vibration: max 16,7 m/s2 (2 g) at 10-55Hz
- Altitude: Below 1000 m inside a building.
The current of the frequency converter must be equal or greater than the maximum current that the motor of
the pump could absorb.
The system is made of:
Frequency converter
Transducer (pressure/temperature/flow are possible)
Mounting Screws
Motor Adapter Kit

flowcon VSD - F Inverter
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Product overview
Flowcon VSD - F inverter is a frequency converter for pumps,that implement the following operating
modes:
Constant pressure;
Proportional pressure;
Constant temperature;
Constant flow;
Night mode;
Fixed speed;
Constant pressure mode and Proportional pressure mode are available also in cascade mode.
Pushbuons functions
The user interface is made by a 6 pushbuons keyboard. Every pushbuon has a specific function
described in the following table.
Through this buon you can start the pump.
Through this buon you can stop the pump.
Through this buon you have access to the frequency converter programming parameters. If you
already are on the programming functions, by pushing this buon you go up on the menu.
Through this buon you have access to frequency converter programming parameters. If you
changed a parameter, by pushing this buon you can confirm the indicated value.
Through this buon you can decrease parameters or to change the visualized parameter.
Through this buon you can increase parameters or to change the visualized parameter.

10
Interface
The graphic interface of the display is divided in three visualization areas:
- System icons
- Display area
- Operating icons
System icons
AUTO MODE
The system is operating in auto mode.
MANUAL MODE
The system is operating in manual mode.
SET-UP MODE ACTIVATED
It shows that the set-up menu is activated. When an icon is blinking you are modifying a parameter. You can
confirm with ENTER.
ALARM
It indicates that there is a fault on the system, the error number appears on the display. When you are on the
setup mode the alarm icon will not appear. If it is blinking it indicates a warning.
SENSOR STATE
It indicates that the system is connected to the transducer, if it is blinking there is a fault on the transducer.

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PUMP STATE
It indicates if the pump is running or in standby state.
CASCADE MODE
It indicates that the cascade control mode is working. The 2 upper symbols shows if the pump is in stand-by.
The lower symbol informs if the pump is the master (lit icon) or slave (blinking icon).
Display area
It is composed from an incremental bar proportional with the displayed value and its measure unit. The
display is backlit, the light will turn o aer 20 seconds of system inactivity.
Operating icons
Constant pressure mode
The system keeps the pressure constant when the quantity of water requested by the user changes.
Proportional pressure mode
The system keeps the pressure proportional to the quantity of water requested by the user.
Constant temperature mode
The system keeps the temperature constant at a set point.
Constant flow mode
The system keeps the flow constant.
Fixed speed mode
The system works at a fixed speed that user can choose according to need.
Submersible pump applications or long cables
To operate a submersed pump (or surface pump), where the distance from the frequency converter is more
than 5 m.
Submersible motor must operate with a frequency between 30 Hz (minimum operating frequency) and 50 Hz
(maximum frequency) for 50 Hz motors, and between 30 and 60 Hz for 60 Hz motors.
The running up time from 0 to 30 Hz and the running down time from 30Hz to 0, must be as short as
possible, according to the motor power to operate.

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Safety
Before using the product it is necessary to acknowledge all the information about safety. All the technical
information, operating procedures, and the indications described in this manual, from transport and handling
to final dismantling.
The specialized technicians must observe the rules, standards and laws of the country where the frequency
converter is sold.
The device is conformed with actual safety standards.
Any improper use may harm people, animals and items.
The manufacturer declines all responsibility in case of dierent use from the expected one described in this
manual.
Do not remove or modify the markings placed on the device. The device must not be started in case of
defective parts.
The frequency converter should never be opened or tampered with and guards that come with it should
never be removed.
The frequency converter must be installed, adjusted and maintained by qualified personnel who understand
the risks involved.
The frequency converter must be fied with voltage surge and overload protection devices, in accordance
with the prevailing safety standards.
The voltage levels inside the frequency converter are dangerous until the backlight of the display shuts down,
and then always aer 10 minutes that the supply voltage is disconnected.
The connections of the alarms can distribute power even when the frequency converter is turned o. Ensure
that there is no residual voltage on the terminals of the alarms.
All the power terminals and other terminals must be inaccessible aer installation is completed.
The maximum output frequency must not exceed the design frequency of the pump being controlled.
Operating at a frequency higher than the allowable frequency can cause higher current absorption and
damage to the device.
If it is necessary to remove the frequency converter, remove only the covers required in order to disconnect
the electrical cables.
Take care not to damage the electronic cards.
Residual risks
The device, for its design and designation (in accordance to intended use and safety standard), has no
residual risks.
Safety icons and information
Heat-sink Hot surface
Self-protection devices
During the installation of the pump, the pump start, and maintenance, is strongly recommended that
the right tools are used.

flowcon VSD - F Inverter
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Transport and handling
The product is packed to protect the contents. During transport do not stack heavy objects on it.
Make sure that during transport the vehicle that is used, is big enough for the total dimension of the
package.
No particular vehicle is needed to move the packed device. The vehicles used must be suited for the
dimensions and weights of the chosen device. (see technical catalogue dimensions and weights).
Handling
Handling is simplified by the handles placed on the box. Take care moving the package, avoid impact.
Do not bring into contact with other materials that could tamper with the frequency converter.
The manufacturer declines any responsibility if the conditions described are not respected.
If the weight is more than 25 kg the package must be handled by 2 people simultaneously.
Installation
In the case of motor mounting the frequency converter, respect the minimum distance suggested in the
instruction manual from the pump.
Do not install the control box or the frequency converter in direct sunlight, or near sources of heat.
Unpacking
Make sure that the device has not been tampered with.
Once the machine is unpacked, the packaging must be disposed of or recycled in accordance with the
standard of the country were the device is sold.
Motor mounted
Connect the heat-sink with the motor adapter, using the provided screws.
Wall mounted
Install the frequency converter on the wall, or inside an electric control box with the specific adapter,
using the provided screws.
Electrical connection
The electrical connections must be done by a qualified electrician, in accordance with the local standards.
Follow the safety standards
Execute the ground connection
Follow the indications reported in this manual
Be careful during electrical connection that no piece of wire, sheath or foreign objects fall into the frequency
converter.
The supply terminal board, and the motor terminal board accommodate cables with maximum section as
reported in TABLE 1. In this case wiring tips should be used.
Wrong connections could tamper the electronic circuit of the frequency converter.
Before any kind of electrical operation on the frequency converter, just installed wait 10 minutes.

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Power supply connection
Electrical supply must comply with the description.
If the electric control box is connected to an electric plant with a dierential switch (ELCB) or a
Ground Fault Circuit Interrupter (GFCI) as a further protection, these devices must comply the following
characteristics:
Suitable to control leakage current and, in case of short pulsed leakage current.
Must operate in case of a fault alternating current, and in case of fault current with DC content, such as fault
pulse DC current and flat DC current.
The electric control box must have installed a B-type dierential switch or GFCI.
These protections must be signed with the followings symbol.
For the electrical connection of each size.
IT power grid supply configuration
IT power grid supply, is also known as “isolated ground supply” because the star point of the power supply is
not related to ground. This kind of power grid supply is to use an insulation controller that constantly monitors
the galvanic isolation between ground and the various power devices.
The converter is able to work also with this typology of power grid supply.
If the frequency inverter is to be used in an IT mains, the relevant IT mains jumpers.
Contact with live components
Risk of fatal injury due to electric shock!
- Never remove the center housing part from the heat sink.
- Mind the capacitor discharge time.
Aer switching o the frequency inverter, wait 10 minutes until dangerous voltages have discharged.
Motor connection
Motor cable must be connected directly to the output terminal board of the frequency converter.
To comply with the EMC standard a 4-pole shielded cable with external shield protection must be used.
The motor cable must never run parallel to the power line of the frequency converter.
Transducers connection.
A transducer is an analog instrument with an output signal of 4-20 mA (or dierent) that continuously reads a
parameter of the system.
For some operating modes it is possible to connect up to 2 transducers:
- Constant pressure mode (the dierence of pressure between delivery pipe and suction pipe).
- Proportional pressure mode (the dierence of pressure between delivery pipe and suction pipe).
- Constant temperature mode (the dierence of temperature between delivery pipe and suction pipe).
- Night mode (a primary pressure transducer, or temperature or flow rate, and a secondary temperature
transducer).

flowcon VSD - F Inverter
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Transducer general characteristics Values
Nominal supply voltage 24 VDC
N° of wires 2 or 3 wires
Output signal (current) 0/4 ÷ 20mA
Output signal (voltage) 0-10V
Minimum drivable load resistance 500 Ohm
Float switch connection
It is possible to connect up to 2 float switches.
To program the float switches, refer to section 10.1 (Dry-run protection). In the picture is shown a connection
example (NC).
Connection of the input for max/min curve operation
It’s possible to connect a switch to enable operation at Max/Min curve.
Connection of the input for second set point operation
It is possible to connect a switch to enable operation with 2nd set-point.
Remote On/O control connection
It is possible to connect a switch for remote on/o control.
Remote alarm connection
It is possible to connect up to 2 alarm signals either in Volt free configuration, or with external supply voltage
configuration (+24VDC maximum current 4A).
Connection of the output for remote parameter monitoring
It is possible to use the analogic output for remote monitoring of the frequency converter’s parameters.
Cascade mode connection
Frequency converters are prearranged for use in pressure boosting sets with a number from 2 to 6 pumps in
the following versions:
Pressure boosting sets with 2-6 variable speed pumps.
Pressure boosting sets with 1 variable speed pump and up to 5 fixed speed pumps.
Cascade mode installation
Connect the frequency converters to the motors.
Connect the transducer (either pressure, temperature or flow rate) to the delivery manifold of the pressure
boosting set.
It is advised to install the pressure transducers on the same point of the delivery manifold and complete the
installation with a pressure gauge.

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Cascade mode electrical connection
Connect the supply cables to the motors and to the power supply following the instructions.
The connection with the power supply must be made with installation of a tripolar circuit breaker (one for
each frequency converter) with proper size and with a B-type dierential switch.
Cascade mode expansion board installation
The cascade mode expansion board must be installed perpendicularly to the control board, checking that
the connectors are properly connected, and that the board fits into the slides.
Make sure that the cascade expansion board is properly connected, otherwise it’s not possible to use the
cascade mode.
Cascade mode connection with 2-6 variable speed pumps
By means a proper cable make the connection of the clamps E4-E5-E6 of the first frequency converter to
the clamps E8-E9-E10 of the next frequency converter.
Check the correct connection sequence and check that terminals of each cable are connected to the right
clamp.
To comply with the standards of electromagnetic compatibility, for cable length greater than 1 meter, it
is recommended the use of a shielded cable with protection sheath connected on the ground on each
frequency converter.
Cascade mode with 1 variable speed pump and 5 fixed speed pumps.
Connect the clamps with contactors according to the diagram, and connect the motor cable and the power
supply cable of the related fixed speed pump to the contactor.
Relay D2 e D3 max 400 VAC/VDC maximum current 0,5 A at 25°C and 0,2 A at 85°C.
Relay D4 – D6 max 250VDC o 30VDC cmaximum current 1 A.
The connection with the power supply must be made with installation of a tripolar circuit breaker of proper
size.
Programming guide
Parameters
On the frequency converter the following information is displayed:
Parameters of pump status
Programming parameters
Alarms
Parameter of pump status
They allow to visualize:
- Working frequency of the pump
- The measure of the transducer (in case of dierential mode the measure is referred to the
dierence between the 2 transducers).
- The current absorption.
- Starting from the basic display by pushing of the directional plus or minus arrows.
Example:

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Programming parameters
To show the programming parameters, select menu. Will be displayed progressively:
UP – User seings: these are the basis seings that the user may change.
AP – Advanced seings: these seings are available only to qualified personnel. To enter password is
required (see section 8.5).
SA – Technical assistance seings: these are the advanced parameters, only technical assistance
personnel are allowed to access this menu. Password is required (see section 8.5).
PC – Constant pressure mode seings: These seings regulate the constant pressure mode. A password
is required to set these parameters.
PP – Proportional pressure mode seings: These seings regulate the proportional pressure mode. A
password is required to set these parameters.
tC – Constant temperature mode seings: These seings regulate the constant temperature mode. A
password is required to set these parameters.
CF – Constant flow mode seings: These seings regulate the constant flow mode. A password is required
to set these parameters.
MAn – Fixed speed mode seings: These parameters allow activation of the fixed speed mode and the
working frequency. Only qualified personnel are allowed to access this menu. Password is required.
AE – Advanced parameter: this allows for the display of secondary parameters which can be useful for
system diagnostics.
AE01 Soware release
AE02 Last 10 alarms
AE03 Supply voltage (V)
AE04 Frequency converter output voltage(V)
AE05 Total working hours
AE06 Number of starts
Supply voltage visualization example

18
By pushing the menu buon the UP parameter appears. Select the AE parameter by pushing the plus up to
arrive at the correct parameter AE, confirm with enter. Select the parameter AE02 by pushing the plus buon
and confirm with enter. Supply voltage is displayed.
Programming
To enter programming, select menu. Use the plus or minus buons to move to the programming parameter
to be modified and select enter to confirm. Use the pushbuons plus or minus to move to the parameter
to be modified and select enter, with the plus or minus buons increase or decrease the value. From this
moment the setup icon start blinking until the value is confirmed with enter.
To exit the program, push menu until when you arrive to the basic display.
When you go in the setup mode the icon will appear.
Example of parameter variation.
In order to modify the set-point pressure from 3.0 bars to 2.8 bars:
Select menu and then with the plus or minus buons until you move to programming parameter UP. Confirm
with enter and then with the plus or minus buons move to the parameters UP06. Confirm with enter and
then with the plus or minus buons change the value up to the desired value. From this moment the setup
icon will start blinking until the value is confirmed with enter. To exit the program, push menu until you arrive
on the basic display, when you exit the setup mode the icon will disappear.
Password insertion
Please contact the oce for passwords.
Factory reset
This parameter allows to reset the frequency converter to factory seings.
WARNING: Before reseing the frequency converter, make sure that the system is O, and that the pump/s
are stopped. Once the reset is done it’s possible to configure the previous seings only manually seing all
the modified parameters.
To reset the frequency converter it is necessary change the value of the parameter AP50 from no to yes, and
push the buon enter.
During this phase the display is turned o for few seconds, then it will turn o, and it becomes possible to
reprogram the frequency converter.
Operating mode programming
Parameters to check when starting up the unit
Check that the motor voltage is matching or it’s lower than the Mains Supply voltage.
If the motor Voltage is dierent from 400V set the parameter SA01 “Nominal Motor Voltage” in order to match
the value wrien in the motor label.
Once the frequency converter is turned on for the first time, aer a short check phase on the display it’s
shown Er13.
If the entered rated current value is not correct there is the risk of pump damage or to have an unexpected
overcurrent alarm Parameter UP03 Nominal pump frequency
The nominal frequency of the pump must be set.
If the entered rated frequency value entered is not correct there is the risk of higher current absorption or
pump damage.

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If the selected programmed mode is dierent from the purpose of the plant there is a risk of pump damage
and/or plant damage.
Constant pressure operating mode
Constant pressure operating mode keeps constant the pressure at a point of the system.
In this operating mode the frequency converter keeps constant the pressure at a set-point value decided by
the user through parameter UP06.
It is possible to have dierent configurations of this operating mode related with the dierent types and
number of transducers installed:
- Constant pressure with 1 pressure transducer (absolute or dierential transducer)
- Constant pressure with 2 pressure transducers in dierential mode.
Constant pressure mode with single transducer (absolute or dierential)
This configuration uses a feedback given by a pressure transducer.
Parameters to program or check (recommended sequence):
Par. Description Suggested value
AP01 Maximum pump pressure Based on pump type
AP02 Primary transducer supply Data sheet transducer
AP03 Primary transducer measuring unit 1 [bar]
AP04 Primary transducer minimum value Data sheet transducer
AP05 Primary transducer maximum value Data sheet transducer
UP02 Nominal pump current See motor plate
UP03 Nominal pump frequency See motor plate
UP05 Operating mode PC
UP06 Primary set-point Demand [bar]
Constant pressure mode with 2 pressure transducers (dierential mode)
If it is required to use a dierential pressure feedback, between delivery and suction of the pump by using 2
transducers it’s necessary to connect the first transducer and the second transducer as shown in section 6.7.
Parameters to program or check (recommended sequence):
Par. Description Suggested value
AP01 Maximum pump pressure Based on pump type
AP02 Primary transducer supply Data sheet transducer
AP03 Primary transducer measuring unit 1 [bar]
AP04 Primary transducer minimum value Data sheet transducer
AP05 Primary transducer maximum value Data sheet transducer
AP06 Secondary transducer supply Data sheet transducer
AP07 Secondary transducer measuring unit 1 [bar]
AP08 Secondary transducer minimum value Data sheet transducer
AP09 Secondary transducer maximum value Data sheet transducer
AP10 Secondary transducer mode DiFF
UP02 Nominal pump current See motor plate
UP03 Nominal pump frequency See motor plate
UP05 Operating mode PC
UP06 Primary set-point On demand [bar]
To ensure the system works properly, the primary transducer (B1-B4 clamps) must be always connected to
the delivery pipe, and the secondary transducer (B5-B8 clamps) must be always connected to the suction
pipe.

20
Minimum run frequency and pre-pause frequency seings
The frequency converter is equipped with an automatic stop system in case of low water. In the case where
the system does not guarantee the correct stop of the pump, it is possible to set manually the following
values:
- Frequency before stop
- Minimum run frequency
In order to manually set these parameters it is necessary to change the value of parameter AP17 from “Auto”
to “Man”. Then the pre-pause frequency values (PC02 and PC04 parameters) and the minimum frequency
values (PC01 and PC03 parameters), must be set using the calculation formulas described in the next
section.
Frequency before stop and minimum run frequency calculation formulas
Adjusting the pre-pause frequency (PC02 and PC04 parameters) allows you to properly stop the pump when
the water demand is low and the pump operation is no longer required (e.g. a leakage or a small flow of a
few liter per minute).
In this case the pump must be stopped for some seconds and the flow is guaranteed by the reserve stored
in the vessel.
The frequency before stop Hz P can be calculated as follows:
50 Hz pumps
Hz=2+ √(Hset÷Hmax )x 50 (*)
60 Hz pumps
Hz=2+ √(Hset÷Hmax )x 60 (*)
where:
- H set is the working pressure in bar
- H max is the maximum pump pressure, in bar, when flow is equal to 0.
(*) For the maximum pump pressure it’s required:
For the pumps operating with suction li subtract the suction li value (in bar).
For the pumps installed with suction positive add the positive suction head value (in bar).
The minimum run frequency (PC01 and PC03 parameters) must be set 6-7 Hz lower than the
frequency before stop.
Proportional pressure mode
The proportional pressure operating mode reduce the pressure proportionally with the water demand of the
system.
In this operating mode the frequency converter keeps a set-point pressure at the maximum frequency, this
set-point pressure could be set with the parameter UP06.
The slope of the pressure-flow rate line could be set through the percentage of the pressure when flow is
equal to 0.
It is possible to have dierent configurations of this operating mode related with the dierent types and
number of transducers installed:
- Proportional pressure with 1 pressure transducer (absolute or dierential transducer).
- Proportional pressure with 2 pressure transducers in dierential mode.
- For detailed program seings see the following configuration sections.
Proportional pressure mode with single transducer (dierential or absolute)
This configuration uses a feedback given by a pressure transducer (connected as shown in section 6.7).
Parameters to program or check (recommended sequence):