FLOWTECH flowcon User manual

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

CONTENTS
OPERATION & MAINTENANCE
GENERAL INFORMATION 3
SAFETY INFORMATION 4
SAFETY WARNINGS & PRECAUTIONS 5
CUSTOMER / CONTRACTOR RESPONSIBILITIES 6
Warranty 7
Description 7
Dimensions 8
Technical Data 8
Functions 9
Protections 9
Installation Hydraulic Connection 10
Electrical Connection 12
Line Connection 13
Pump Connection 13
Auxiliary Connector Connection 14
Start Up 16
Programming 16
User Parameters 17
Installer Parameters 18
Alarms 21
Troubleshooting 22
Maintenance 23
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 - B 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 - B 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 - B 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

Warranty
The manufacturer guarantees this product for a period of 24 months as of the date of sale; the
device must be returned together with this instruction manual, with the date of installation and
programmed parameters noted in the last page of this document.
The guarantee will be rendered null and void if the device is tampered with, disassembled, or
damaged due to causes aributable to incorrect use and/or improper installation, if it is used for
purposes other than as specified, if it is installed in unsuitable environmental conditions or if it is
connected to an electrical installation that does not comply with current standards.
The manufacturer declines all liability in the event of damage to objects and/or physical injury
caused by failure to install the necessary electrical safety devices up line of the device, or due to an
unprofessional installation.
Installation and maintenance of this device must be performed by specialist personnel, able to fully
understand the contents of this instruction manual.
All operations performed with the device cover removed must be performed with the power mains
disconnected.
As there are no concrete reasons for removal of the electronic board, take into account that some
of the board parts remain live for a few minutes also aer disconnecting the device from the
mains.
The manufacturer declines all liability in the event of damage to objects and/or physical injury
caused by failure of an internal protection device, with the exception of the refund of the device, if
still covered by the guarantee. This device complies with the directive ROHS 2002/95/EC.
Description
Flowcon VSD - B Inverter is an electronic control device for single phase electric pumps which
enables automatic start-up and shutdown of the pump, protecting it in the event of adverse
operating conditions (failure of water supply, motor overload, risk of ice).
The Flowcon VSD - B Inverter can operate on various systems:
- with a single electric pump,
- in a twin pump system in which the two alternate automatically
Flowcon VSD - B Inverter inverter is programmable to operate on the basis of two dierent
principles:
- mode P+F (pressure + flow) = in this mode, the pump is started up following a fall in pressure,
when the minimum set threshold is reached (Pmin); the pump operates until the water supply runs
out and there is zero flow through the device. In this condition the resulting pressure in the system
will correspond to the maximum pump head.
- mode P+P (pressure + pressure) = in this mode the pump operating mode is controlled within
two pressure levels (Pmin e Pmax); when the lower pressure threshold is reached (Pmin) the
pump is started up, while it is stopped when the upper pressure threshold (Pmax) is reached.
In this configuration, the use of an expansion vessel is essential, sized according to the system
requirements and type of pump.
flowcon VSD - B Inverter
7

Dimensions
In both operating modes, the device protects the pump from dry running in the absence of water
on intake, by means of a combined control on flow and pressure.Operation of twin pumping units is
admissible only in "P+P" mode.
Technical Data
Mains power: single phase 115-230Vac ±10% - 50/60Hz
Motor output: single phase 230V~
Maximum motor power: 2200W – 3Hp
Maximum motor phase current: 16A
Maximum admissible pressure: 1000 kPa (10 bar)
Maximum liquid temperature: 30°C
Max. ambient temperature: 35°C
Pressure drop: 0.7 bar at 100 l/min
Hydraulic connection: 1” M-M (1”F inlet; rotary on request)
Protection rating: IP 65
Weight: 0.7 kg
Dimensions: 225x150x115 mm
Type of action 1.C (according to EN 60730-1)
The remote connector is insulated from the network power by a “main” type insulation
(basic insulation according to EN 60730-1). Any circuit which will be connected to this
terminal, will acquire the same insulation grade from the network power. For this reason
the connection must be carried out using a cable type that can guarantee the additional
insulation.
8

Functions
•Automatic start-up and shutdown of the pump.
•Operation with twin units operating alternately.
•Easy and precise control of working pressures via the display.
•Protection against dry running with automatic reset
•Installable in both horizontal and vertical positions
•Digital indicator of pressure and absorbed current on display
•Operating status indicator LED’S (mains, error, pump running)
•Digital input for float or remote control connection
•Configurable relay output
•Removable electrical terminals to facilitate wiring.
•Alarm log
Protections
•Dry Running
•Motor current control protection
•Overpressure cut-out
•Anti-freeze protection
•Prevention of mechanical pump part seizure
flowcon VSD - B Inverter
9

Installation Hydraulic Connection
Flowcon VSD - B Inverter Inverter must be installed on the pump delivery in a horizontal or
vertical position, in observance of the flow direction indicated by the arrow on the cover.
The water on the pump outlet passes through the device for subsequent distribution to the
various utilities.
The water entering the Flowcon VSD - B Inverter Inverter must be free of impurities and/or
other substances that could prevent movement of the check valve on the interior. To minimise
this problem special filters should be fied on the pump intake.
Install a small expansion vessel (1-2 litres) downline of the inverter, to limit restarts caused by
small leaks, the presence of which is normal on most systems.
The pre-load valve of the expansion vessel must be suitable for the set pressure values.
This provision also helps to improve constant performance levels in the event of low water
demands by the system (e.g. washing machines, WC flushes, etc.).
It is essential that no check valve is installed between the inverter and the electric pump or
between the device itself and the utilities, as this may cause device malfunctions.
However, a check valve may be fied in the electric pump intake line to avoid drainage at the
time of shutdown.
The device should not be installed in pits or watertight enclosures where there is a strong risk
of condensation.
 CAUTION: when the pump stops the pipes might be still under pressure; therefore,
before any intervention, it is advisable to discharge the system by opening a tap.
 CAUTION: this device is not to be considered a mechanical pressure reducer and
therefore all system parts must be sized according to the maximum supply pressure of the
pump.
EXAMPLE OF INSTALLATION ON SINGLE ELECTRIC PUMP
Flowcon VSD - B Inverter can be fied on
submerged or surface pumps. Pressure
seings must take into account the water
column (H) on outlet from the device,
considering 0.1 bar pressure per metre of
water column.
10

EXAMPLE OF INSTALLATION IN TWIN PUMP BOOSTER SETS
Connect the intake lines of the pumps to a
common manifold and install one inverter on
the delivery line of each electric pump. The
device outlet couplings must be connected
to a single delivery manifold, which must be
connected to the expansion vessel.
flowcon VSD - B Inverter
11

Electrical Connection
Insert the electric wires in the cable clamps, observing the correct order of assembly for all
components Tighten down the threaded nuts to avoid traction and rotation of the cables
from the exterior. The central cable clamps for the auxiliary contact is blank; if you wish
to insert a wire for remote control (or electric float), pierce the plastic nut by means of a
screwdriver aer removing the nut from the unit. For electrical connections use the terminals
supplied with the device.
 CAUTION: Insert the terminals, positioning them so that the cable tightening screws
are not adjacent!
WRONG
CORRECT
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The device power supply is single phase at 115-230 Volt 50/60Hz. The electrical system to
which the device is connected must comply with current standards and must therefore be
fied with:
- automatic thermal magnetic circuit breaker with high breaking power and trip current in
proportion to the power of the pump installed.
- earthing connection with total resistance in conformity with local standards and in any
event no more than 100m.
If the device is used in swimming pools, fountains, or garden ponds, a residual current circuit
breaker type "A" must be installed, with In=30mA.
If the device is not equipped with a power cable and plug, install another device that ensures
omnipolar disconnection from the mains with a contact opening gap of at least 3 mm.
If the terminals supplied are not used, the faston terminals must be crimped by specialist
personnel using special pliers.
The recommended cable section is 1.5mm2, compatible with electric pumps up to 16A.
The type of electric cable must correspond to the conditions of use (use in domestic rooms,
dry or wet, for installation indoors or outdoors).
Line Connection
Pump Connection
 CAUTION:
- all electrical connections must be made by specialised personnel
- incorrect connections of the electric motor can cause damage to the device or the pump
motor itself.
- failure to observe the instructions in this section can cause serious damage and/or
physical injury and releases the manufacturer from all liability.
- in the event of damage to the power cable or the cable between the inverter and the
electric pump, it must be replaced exclusively by the device manufacturer or assigned and
suitably qualified personnel, to prevent risks to objects and persons.
Flowcon VSD - B Inverter can be installed on single phase
pumps with 230Vac power supply, already fied with capacitor.
Therefore at the time of electrical connections, ensure that
the terminals in the electrical compartment of the motor are
connected according to the instructions of the electric pump
manufacturer. The figure alongside shows a typical example of
connection.
If the terminals supplied are not used, the faston terminals
must be crimped by specialist personnel using special pliers.
The recommended cable section is 1.5mm2.
The type of electric cable must correspond to the conditions of
use (use in domestic rooms, dry or wet, for installation indoors or outdoors).
Also observe the installation limits as declared by the manufacturer of the electric pump
connected to the inverter.
flowcon VSD - B Inverter
13

Auxiliary Connector Connection
The Flowcon VSD - B Inverter is equipped with a
connector to make auxiliary contacts available for
additional functions, interfacing the device with other
external equipment.
The functions of each terminal depend on the seings
of the parameter “Aux. Con.” According to the diagram
below. Functions “1” and “4” are available only if the
operating mode is set to “P+P” (pressure+pressure).
* Further information regarding the set-up of twin
booster sets can be found at the end of this manual, in
appendices A and B
Seing
Aux. Con.
Mode admied Associated function:
0 P+F / P+P None, inputs and outputs disabled
1 P+P Combination of two inverters in a twin pumping system with
automatic alternation.
2 P+F / P+P Availability of an input to enable operation (for example of an
external float) and a relay output for alarm status signals.
3 P+F / P+P Availability of an input to enable operation (for example of an
external float) and a relay output for motor operation signals.
4 P+P Combination of one B Inverter with an S inverter for the set-up
of a constant pressure twin pumping system with a reserve
pump.
DESCRIPTION OF FUNCTIONS OF AUXILIARY CONTACTS:
Parameter "Aux. Con.” = 0
In this mode, all functions of the auxiliary contact are disabled.
Parameter "Aux. Con.” = 1 – Operation in twin set mode with two inverters
In this mode two devices can be connected to operate in an
alternating twin booster set. If pressure falls, the "master" pump
is started up first, followed by the "slave" pump (when required);
shutdown of the pumps is simultaneous when the maximum
operating pressure is reached (Pmax). Terminals 1 to 4 are
used for the connection of two devices while terminals 5 and 6
provide a relay output that is activated in the event of an alarm.
The parameter "Aux. Con.” can only be set to “1” if the current
operating mode is “P+P” (pressure+pressure).
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Parameter "Aux. Con.” = 2 – External enable and alarm signal.
In this mode, an external electrical device (e.g. float,
timer, switch, etc.) can be connected between terminals
1 and 3, to enable remote operation of the pump. In this
mode the motor is only started up if the external contact
between terminals 1 and 3 is closed.
Terminals 5 and 6 provide a relay output that is activated
in the event of an alarm.
Jumpers must be wired onto terminals 2 and 4.
Parameter "Aux. Con.” = 3 – External enable and pump operation signal.
In this mode, an external electrical device (e.g. float,
timer, switch, etc.) can be connected between terminals
1 and 3, to enable remote operation of the pump. In this
mode the motor is only started up if the external contact
between terminals 1 and 3 is closed.
Terminals 5 and 6 provide a relay output that is activated
when the pump is running; this signal enables the control
of external devices that have to operated in conjunction
with the electric pump (for example a batching system
for chlorine, fertilizer, detergents etc.).
Jumpers must be wired onto terminals 2 and 4.
Parameter "Aux. Con.” = 4 – Combination with S inverter device.
When the parameter "Aux. Aus.” is set to 4 the B Inverter can be interfaced with an inverter
in the S range to produce a hybrid pressurisation unit, i.e. a variable speed pump and a fixed
speed pump that intervenes as a backup to the main
pump only in the event of increased water demands by
the system.
During routine operation, the system demands are
normally met by the pump with the S inverter, which
is always started up first. When the demand for water
increases to such a point that the first pump is no longer
sucient, the fixed speed pump, installed together with
the B Inverter is then started up. Terminals 1 to 4 are used
for the connection of two devices while terminals 5 and 6
provide a relay output that is activated in the event of an
alarm. The parameter "Aux. Con.” can only be set to “4” if
the current operating mode is “P+P” (pressure+pressure).
flowcon VSD - B Inverter
15

Aer making all the electrical connections and ensuring the correct condition of all
components, close the unit cover and power up the system.
The Flowcon VSD - B Inverter Inverter starts up the pump automatically to enable circuit
filling.
If the pump does not start, or anomalous vibrations are detected, ensure correct connection
of the pump and relative capacitor.
To facilitate filling of the electric pump, press and hold the “+” key on the main screen to
override pump operation without intervention of the dry-running protection (“Manual” mode).
Aer seing all data in the device, note them on the relative form found at the end of this
manual for future reference and to maintain the guarantee.
Start Up
 CAUTION: On initial start-up, prime the pump before powering up the system!
Programming
1. Display with digital pressure indicator, error display,
configuration menus.
2. Programming keys
3. Green mains power ON indicator light (LINE)
4. Red error indicator light (FAILURE)
5. Yellow "pump running" indicator light (PUMP ON)
Key Description
Arrow/reset: scrolls forward through menus and performs
unit reset in the event of alarms and/or errors
“+” key: increments the parameter value currently on display;
enables device operation override (starts pump as an
override command and temporarily disables the dry-running
protection to facilitate loading on initial start-up).
“-” key: decreases the parameter value currently on display; shows the absorbed current
(optional)
The menu is divided into two levels: the user level and the installer level. The user level is usually
visible during normal operation and enables the user to control the system operating status,
reset any errors and modify the language.
16

User Parameters
These parameters are normally accessible when the device is
powered.
Main screen: during normal operation of the inverter, the display shows
the device status. The top line displays the pressure measured in the
system, while the boom line shows the motor current absorption.
In this screen, press and hold the key “+” to override pump operation
also when there is no water, temporarily disabling the dry-running
protection to enable the pump to be filled.
When the device is configured to operate as part of an alternating twin
pumping unit, the boom line shows the "master" or "slave" status by
means of the leer "m" or "s".
Language: the language of the menus and alarm messages can be
personalised as required. Use keys + and – to modify the parameter
value.
flowcon VSD - B Inverter
17

Installer Parameters
These parameters are located in concealed screens and are normally only modified during
the installation phase. To access these pages, press and hold “+” and “-“simultaneously for 5
seconds. Aer accessing the concealed menu, use the arrow key “>>” to scroll through the
screens and keys “+” and “-“to modify the parameters. To return to the main screen, press
and hold keys “+” and “-“simultaneously for 5 seconds.
Operating mode: this parameter enables the user to set the operating
mode implemented by the B Inverter to control pump start-up and
shutdown. In mode P+F (pressure+flow) the pump is started up when the
pressure falls below the value set in Pmin (start-up pressure) and is
stopped when the water flow through the device is virtually zero. In this
condition the resulting pressure in the system will correspond to the maximum head of the
pump installed. In mode P+P (pressure+ pressure) the pump is started up at the value set in
Pmin and is then stopped when the system pressure reaches the value Pmax (stop
pressure). In this mode, the installation of an expansion vessel is essential, sized according to
the system specifications.
In both operating modes, the dry-running protection is enabled, and trips when the water
flow is zero and the system pressure is below the value Pmin.
Operation within twin booster sets is only admissible in mode P+P and consequently, the
seings of the parameters “Aux. Con.”, “Pmax” and “Pmin2” depend on the pre-set operating
mode.
Pmin: this parameter represents the minimum pressure at which the pump
is started. The parameter can be set from 0.5 to 8.0 Bar. The factory seing
is 1.5 bar. Use keys “+” and “-“to modify the set value.
Pmax: this parameter is only available when the operating mode is set to
P+P (pressure+pressure) and represents the electric pump stop pressure.
The parameter can be set from 1.0 to 9.0 Bar and in any event at least 0.3
Bar higher than the set value of Pmin. Use keys “+” and “-“to modify the set
value.
Pmin2: this parameter is only available when the operating mode is set to
P+P and the parameter Aux. Con. is set to “1” to enable operation of twin
booster sets. This parameter defines the secondary (slave) pump start-up
pressure when the primary (master) pump can no longer meet the system
demands. The parameter can be set from a minimum of 0.5 Bar to a maximum value equal
to the pressure Pmin-0.2 Bar. The factory seing is 1.2 bar. Use keys “+” and “-“to modify the
set value.
Auto-reset interval: during operation of the pump, if water supply on intake
fails temporarily, the inverter shuts o the power supply to the motor to avoid
any damage. This screen enables the user to set aer how many minutes
the device should auto-reset to check renewed availability of water on
intake. If the aempt is successful, the inverter exits automatically from the error condition
and system returns to operative status; otherwise another aempt is made aer the same
time interval. The maximum seable interval is 180 minutes (recommended interval: 60 min.).
Use keys + and – to modify the parameter value.
18

N° auto-reset tests: this parameter defines the number of aempts made by
the inverter to try an resolve a shutdown caused by dry running conditions. When this limit is
exceeded, the system shuts down and user intervention is required. The auto-
reset is disabled if this value is set to zero. The maximum admissible number
of aempts is 100. Use keys + and – to modify the parameter value.
Delay on stop: this parameter enables the user to define aer how many seconds the electric
pump is stopped following closure of all utilities in mode P+F. At low flow rates, if frequent
pump start-ups and shutdowns occur, increase the shutdown delay to render
operation more uniform. An increase to this parameter may also be useful
to eliminate excessively frequent activation of the dry-running protection,
especially in the case of submerged pumps or on those with self-priming
problems. The factory seing is 10 seconds, and may be increased to a maximum of 120
seconds. Use keys “+” and “-“to modify the stop delay.
24H anti-seizure protection: this parameter enables the activation of a function that
automatically starts up the pump aer 24 hours of disuse. If this function is activated, and the
pump is not started up for 24 hours, the B Inverter overrides to a cycle of 15
seconds to prevent system disuse from leading to mechanical seizure of parts
(e.g. the seal), maintaining system
4°C ice protection: this parameter enables activation of a function that may help prevent
damage due to lowering of ambient temperatures and the risk of ice formation. In particular,
if the ambient temperature falls below 4°C, the B inverter starts up the pump
every 30 minutes for a duration of 15 seconds, to avoid, when possible, the
rapid freezing of the water inside the pump. CAUTION: although this function
can reduce the risk of damage caused by ice, it is good practice not to use the
inverter and the electric pump in environments where temperatures can fall below 4°C.
The activation of this function is not sucient to guarantee operation and protection of
the system if temperatures are close to or below 0°C!!
Imax: this optional parameter enables entry of the maximum current absorbed by the electric
pump in routine conditions, to enable shutdown of the motor in the event of excessive
absorption. The motor is also shut down event if the current read during
operation is below 0.5 A following interruption of the connection between
the motor and the inverter. The trip time of the current overload safety device
is inversely proportional to the entity of the overload in progress; therefore
a slight overload will lead to a more delayed trip time while a more significant overload will
accelerate the trip time. The parameter is seable from 0.5 to 16 A by means of the keys “+”
and “-“. To deactivate the current control protection of the motor, press the key “-“until the
text “OFF” appears on display. CAUTION: the factory seing is OFF and therefore a maximum
current value must be set to activate the protection.
Auxiliary Contact: this parameter enables the user to assign a specific function to the
auxiliary contacts available on the Flowcon VSD - B Inverter Inverter
flowcon VSD - B Inverter
19

Limit pressure: this parameter defines a pressure threshold over which the overpressure
protection is activated. The factory seing is OFF, to indicate that the protection
is disabled. To set a limit pressure, use keys “+” and “-“. To disable the function,
press the "+" key until the text OFF is displayed.
Deactivation threshold: when the B Inverter is configured to operate in conjunction with an S
inverter device (mode set to P+P and Aux. Con. set to “4”), this parameter can
be set to define the secondary pump deactivation threshold. The secondary
pump where the Flowcon VSD - B Inverter is installed, is started up, on request
of the inverter controlling the primary pump, when the pressure falls below
Pmin. The secondary pump is shut down when the required flow falls below a limit set in this
parameter. The factory seing is 20 and the parameter can be set from 10 to 50. The seing
of this threshold depends on the type of pumps used, considering that a higher value of this
parameter corresponds to a quicker shutdown of the auxiliary pump, while a lower threshold
value maintains the auxiliary pump in operation even when the flow rate falls to low values.
Alarm log “1”: in this screen the user can read the number of alarms that have tripped due to
activation of the dry-running protection (DR) and the pressure overload device
(OP). These data can be checked in the event of a malfunction.
Alarm log “2”: in this screen the user can read the number of alarms that have tripped due
to activation of the current overload protection (OL) and the ice protection (IP).
These data can be checked in the event of a malfunction.
Hour counter: this screen displays the total operating hours of the inverter (in terms of the
time for which the device has been connected to the electric power supply).
If the key “+” is pressed on this page, the number of pump operating hours is
displayed.
20