Algodue ELETTRONICA UPM307 User manual

UPM307
UNIVERSAL POWER METER
USER MANUAL
1. INTRODUCTION
Thismanualprovidesinformationontheinstallation,configurationanduseofthemaininstrumentfunctions.
The manual is not intended for general use, but for qualified technicians.
This term indicates a professional and skilled technician, authorised to act in accordance with the safety
standards relating to the dangers posed by electric current.
This person must also have basic first aid training and be in possession of suitable Personal Protective
Equipment.
WARNING!
It is strictly forbidden for anyone who does not fulfill the above-mentioned requirements
to install or use the instrument.
The instrument complies with the European Union directives in force, as well as with the technical standards
implementing these requirements, as certified by the CE mark on the device and on this Manual.
Using the meter for purposes other than intended ones, understood by the manual content, is strictly
forbidden. The information herein contained shall not be shared with third parties. Any duplication of this
manual, either partial or total, not authorised in writing by the Manufacturer and obtained by photocopying,
duplicating or using any other electronic means, violates the terms of copyright and is punishable by law.
Any brands quoted in the publication belong to the legitimate registered owners.
NOTE. This manual describes the use of the main instrument functions.
1MAUXX307018

2
2. GRAPHIC SYMBOLS
Some instructions in the manual and on the device are highlighted by graphic symbols to draw the reader’s
attention to the operational dangers. The following graphic symbols are used:
DANGER!
This warning indicates the possible presence of voltage exceeding 1kV on the marked
terminals (even if for short periods).
WARNING!
This warning indicates the possible occurrence of an event which may cause a serious
accident or considerable damage to the device if suitable precautionary countermeasures
are not taken.
ATTENTION!
This warning indicates the possible occurrence of an event which may cause a light accident
or damage to the device if suitable precautionary countermeasures are not taken.
NOTE. This warning indicates important information which must be read carefully.
3. DESCRIPTION
UPM307 is a power meter able to measure the main electrical parameters on three-phase systems.
Thanks to the TRMS measurements it provides accurate measurements even for distorted waveform. The
backlighted LCD display is very large and highly efficient therefore it guarantees perfect visibility even in
difficult environment condition. A simple menu structure makes the instrument easy to use and allows
a quick check of the measured parameters. The working parameters can be easily set up by instrument
keypad. The PC connection allows to read out the three-phase electrical parameters from the instrument
and to perform setup operations.
UPM307 replaces multiple analog meters as well as single function meters such as voltmeters, ammeters,
wattmeters, varmeters, frequency-meters, powerfactor-meters, energy-meters, etc.
Standard configuration
3-Phase analyser, 2 digital outputs.
The basic instrument can be customized with some options to fit to the specific application.
The UPM307 is a compact, cost effective meter operating both as a stand-alone device or as part of a more
extensive energy monitoring and management network.
4. PRELIMINARY VERIFICATION
NOTE. At the opening the box, check that the instrument has not been damaged during
transport.
If the instrument appears to be damaged, contact the aftersale service.
The box contains:
the instrument•
two mounting accessories•
the user manual•

3
5. INSTALLATION
NOTE. The equipment complies with the 89/366/EEC, 73/23/EEC standards and following
amendments. However, if not properly installed, it may generate a magnetic field and radio
interference. This is why compliance with EMC standards on electromagnetic compatibility
is essential.
5.1 ENVIRONMENTAL REQUIREMENTS
The environment in which the instrument is installed must satisfy the following features:
No vibrations•
Indoor area•
Temperature between -10°C and +60°C•
Storage between -25°C and +75°C•
Max. humidity 80% without condensation•
Altitude up to 2000m•
NOTE. The instrument must not be exposed to sun rays.
5.2 MOUNTING
The size of the hole must be 91x91 mm (tolerance: +0,8...-0 mm).
To mount this instrument, read carefully the following instructions:
Remove the mounting accessories from the instrument.1.
Insert the instrument into the hole by the front part of the panel.2.
Hold the instrument fixed against the panel and insert the two3.
mounting accessories into the fixing screws in the two corners of
the unit.
Tighten the nuts until the instrument is fastened.4.
When several instruments are mounted close to each other, drill as
indicated in the picture.
ATTENTION!
Tighten the nuts gradually until the instrument is fastened. Do not over-tighten to prevent
any damage to the instrument.

4
4
5
2
1
3
4
5
1
3
6
6. SAFETY MEASURES
DANGER!
This warning means that a voltage exceeding 1kV (even if for short periods) may be present
on the terminals.
WARNING!
Electrical instrument connections must be carried out only by skilled technicans who
are aware of the risks involved to the presence of voltage. Before connecting, check the
following:
1. the conductor wires are not powered.
2. the instrument is connected according to the appropriate diagram (see section 7.6)
3. the power supply corresponds to the values on the instrument label.
4. the instrument has been installed in a vibration-free environment a suitable temperature (see
section 5.1).
5. the terminals are no longer accessible after being connected.
6. the wiring is carried out in accordance with the standards in force in the country where the instrument
is to be installed.
7. an isolator and an over-current device (e.g. fuse) are installed between the instrument power supply
and the electrical system.
8. the connections are made respecting the polarities. Important: L1 of the voltage input = L1 of the
amperometric input.
9. input and output polarities are respected when using current/voltage transformers.
10. the connectors are fixed in such a way that they cannot be accidentally disconnected.
7. ELECTRICAL CONNECTIONS
WARNING!
Before making any connection, check that the control panel main switch is OFF.
SERIAL VERSION LONBUS VERSION
Available according to the power supply type

5
4
5
1
3
4
5
1
3
8
7
PROFIBUS VERSION ETHERNET VERSION
The connections are made on the back side of the instrument according to the following order.
1. Digital outputs. See section 7.5
2. Communication port (optional). See section 7.1
3. Power supply. See section 7.7
4. Current inputs. See section 7.6
5. Voltage inputs. See section 7.6
6. FTT-10 LONBUS communication port (optional). See section 7.2
7. RS485 PROFIBUS communication port (optional). See section 7.3
8. ETHERNET communication port (optional). See section 7.4
7.1 SERIAL COMMUNICATION PORT (optional)
Serial port allows a PC connection. The communication port can be supplied
on request as RS232 or RS485.
7.1.1RS 232
The RS232 interface allows a point to point connection: i.e.
instrument to PC or other device. The maximum recommended
length for this type of connection is about 5 m. For the connection
useashieldedcablewith3conductorswithaDB9femaleconnector
or DB25, according to the pictures below. The shield must be
connected to the frame of connector.
Terminal DB9F DB25F
RxD Pin 3 - TxD Pin 2 - RxD
TxD Pin 2 - RxD Pin 3 - TxD
GND Pin 5 - GND Pin 7 - GND
Link pins 7 - 8 Link pins 4 - 5
Link pins 1 - 4 - 6 Link pins 6 - 8 - 20

6
PIN
LED
7.1.2RS 485
The easiest and cheapest way to connect different measuring devices in a network is the RS485 serial line.
The RS485 standard interface allows a multi-point connection. Between PC and the network, it is required a
Serial RS232 to RS485 Converter. If more than 32 instruments are to be connected, insert a signal repeater.
Each repeater can manage up to 32 instruments. For the connection among the different modules, use a
cable with a twisted pair and a third wire.
The type of connection shown in the following picture uses the third conductor to ensure that all the devices
on the network have the same reference level and improve the reliability of communication.
When there are strong electromagnetic disturbances, which may affect communication, a shielded cable
should be used.
The Rt termination resistance must be installed on the PC and the last instrument connected along the line.
Thanks to these resistances, the reflected signal along the line is reduced.
For a typical telephone pair, Rt can have values from
120 to 150 Ohm.
NOTE. the value of each resistance must not
be lower than 120 Ohm in order to avoid an
overload of line drivers.
The max. recommended distance for a connection is
1200 m at 9600 Baud. For longer distances, lower baud
rates or low-attenuation cables or signal repeaters
are needed.
7.2 FTT-10 LONBUS COMMUNICATION PORT (optional)
The LONBUS interface allows a point to point connection: i.e. instrument to PC or other device. The maximum
recommended node-node length is about 400 m without repeaters. For the connection use a cable UL Level
4, 0.5 mm, 22 AWG twisted pair.
FTT10 LONBUS communication port; connect a single twisted
pair to communicate directly on Lo n Wo r k s TM network.
Service Pin LONBUS communication switch; to enable the
Lo n Wo r k s TM communication, press Service Pin with a
sharpened object (e.g. a pencil) paying attention not to
damage the overlay layer of the switch.
Comm. Diagnosis LED LED for diagnosis messages on the communication
status;
LED OFF = communication OK
LED is flashing = no communication

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3 RxD/TxD-P
5 DGND
6 VP
8 RxD/TxD-N
3
5
6
8
6 350 Ohm 3 220 Ohm 8 350 Ohm 5
LED
7.3 RS485 PROFIBUS COMMUNICATION PORT (optional)
The PROFIBUS interface allows a point to point connection: i.e. instrument to PC or other device. For the
connection use a STD cable for PROFIBUS connection with a 9-pole male connector on the device side. If
the standard cable for PROFIBUS is not available, produce one according to the scheme in the picture. Pay
attention that the connectors at the two edges of the cable must comply to the scheme in the picture.
The following list describes the signals used on the PROFIBUS interface.
Pin. Signal name Meaning
1 SHIELD (1) Not Connected
2 M24V (1) Not Connected
3 RxD/TxD-P Receive/Transmit-Data-P
4 CNTR-P (1) Control-P
5 DGND Data Ground
6 VP (2) Voltage Plus
7 P24V (1) Not Connected
8 RxD/TxD-N Receive/Transmit-Data-N
9 CNTR-N (1) Not Connected
(1) Signal is optional
(2) Signal is only necessary at station at end of bus cable.
The instrument back side is provided with the PROFIBUS network connector and
two rotary BCD switches, for network address programming.
For the configuration of a device in a PROFIBUS DP network, the following items
are required:
Master PROFIBUS DP (e.g. PLC Siemens Simatic S7 300, 400 or PROFIBUS•
interface for PC based control, to be plugged into the PC automation
system).
PROFIBUS network configuration program (it is usually supplied with the Master•
PROFIBUS DP)
Device•
“ALGO0509.GSD” file supplied with the instrument•
Before using a DP system, all stations should be given one single address.
The range of addresses that can be given to a PROFIBUS DP node goes from 1 to
99. The instrument back side is equipped with two selectors which can be used
to set the node address.
Example: node 15; with a screwdriver, select 1 on selector 1 and 5 on selector 2.
ATTENTION!
When the module, equipped with VPC3+, is operating, it has to be taken into consideration that
a not conform to the standards behaviour might occur, if in a multi-master-system:
at the same time DP masters class I and II accesses the slave with parametring/configuration•
data (very low probability)
other PROFIBUS Layer 2 based masters are involved•
Cable picture to be produced Cable termination Male 9 pin connector
Selector 1
(tens)
Selector 2
(unit)
RS485
connector

8
8
7
6
5
4
3
2
1
10/100
LINK
ERR
RESET
7.4 ETHERNET COMMUNICATION PORT (optional)
The ETHERNET interface allows a connection between the instrument and an ETHERNET network. For the
connection use an HUB or a Switch. If the instrument is set on STANDARD protocol and it is connected to
the network, all instrument measurements can be displayed remotely on a PC by typing the IP address of
the instrument ETHERNET interface in the web address field.
10/100 (green LED) Indicates the communication speed.
LED ON=100 Mbit/s•
LED OFF=10 Mbit/s•
LINK (yellow LED) Indicates link status.
LED ON=link OK•
BLINKING LED=link activity•
ERR (red LED) According to the LED operation, it can indicates:
LED ON=an error occurred in ETHERNET interface or ETHERNET•
interface boot phase
BLINKING LED=parameters restore in progress•
The following list describes the pin meaning of the ETHERNET port.
Pin. Meaning
1 Tx+
2 Tx-
3 Rx+
4 Not used
5 Not used
6 Rx-
7 Not used
8 Not used
The ETHERNET configuration is as follows:
IP Address = 192.168.1.253•
Subnet Mask = 255.255.255.0•
Gateway = 192.168.1.1•
Listen Port = 3000•
Serial Option = 57600,N,8,1•
To change the ETHERNET configuration, refer to the ETHERNET interface User
Manual.
LAN
port

9
A) PNP wiring
B) NPN wiring
7.5 DIGITAL OUTPUTS
The instrument is equipped with two digital outputs. The digital outputs can be programmed for alarm
tripping or energy pulse emission.
WARNING!
Before connecting or disconnecting
the digital outputs, be sure that the
instrument is not powered. The power
supply line, the measurement inputs
and any other voltage source must be
disconnected.
7.5.1 Digital outputs connection
For short distance electrical connections use
normal single or multi-polar cables. For longer
connections, the signal cables must not lie close
to the power supply wires. If the signal cables and
power supply wires cross, keep a right angle (90°)
to limit the magnetic field. The needed function is
programmed through instrument setup.
Maximum withstandable voltage: 50 VDC
Maximum load current: 100 mA
WARNING!
On request, the unit is supplied with the digital outputs for wiring A (PNP) or B (NPN). Refer
to the label on the back of the meter in order to identify its configuration.
WARNING!
The outputs are not protected against overloads and short-circuits.

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7.6 VOLTAGE AND CURRENT INPUTS
Connect the voltage and current inputs according to the pictures below.
NOTE. In case of Rogowski coils, please check that YELLOW cable edge is connected to S1 (signal)
and the WHITE cable edge is connected to S2 (common).
3 phases, 4 wires, 3 current transformers (3.4.3)
direct connection connection with voltage transformer
3 phases, 3 wires, 3 current transformers (3.3.3)
direct connection connection with voltage transformer
3 phases, 3 wires, 2 current transformers (3.3.2)
direct connection connection with voltage transformer

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3 phases, 3 wires, 1 current transformer (3.3.1)
direct connection connection with voltage transformer
3 phases, 2 wires, 1 current transformer (3.2.1)
direct connection connection with voltage transformer
1 phase (1ph)
direct connection

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WARNING!
Check that:
1. if the instrument must carry out bi-directional measurements to obtain correct measurements, the
connections must respect the polarities.
2. the connections are made according to the diagrams in the following section, respecting the cyclic order
of phases (important: L1 of the voltage input = L1 of the current input)
3. when voltage or current transformers (PT / CT) are used, in the input and output polarities must be
respected.
4. before disconnecting current input the load power supply is cut off.
If this is not possible, the secondary CT must be short-circuited.
7.6.1Voltage specifications
The standard voltage specifications are listed below:
NOTE. The label on the meter defines the real configuration.
Input voltage 600 (750) VAC L-L
Input impedance ›1.3 MOhm
Load max 0.15 VA per phase
7.6.2Current specifications
The phase and polarity of the input current are an essential parameters for a proper instrument operation.
The stardard current specifications are listed below:
NOTE. The label on the meter defines the real configuration.
Rated input current 1 or 5A, programmable
Input impedance approx. 0.02 Ohm
Load max 0.5 VA per phase
Isolation max 150Vrms between phases
7.7 POWER SUPPLY
Connect the power supply to the L and N terminals on the back side.
WARNING!
Beforeconnectingthe instrumenttothe network,checkthat thenetworkvoltagecorresponds
to the value on the label.
Version Power supply
A 115 VAC +15% -20%
B 230 VAC +15% -20%
C 65÷250 VAC / 90÷250 VDC
R 19÷60 VDC
It is recommended to install an external 315mA fuse (or equivalent protection circuit) as well as a switch
on power supply terminals.

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8. USE AND CONFIGURATION
NOTE.Thechapterdescribesthemainconfigurationparametersofthestandardversionofthemeter.
Thepagesdescribedinthismanualrefertotheinstrumentsetin3-PHASE,4-WIRE/3CTwiringmode.
Some pages may differ or disappear if the wiring mode is different.
8.1 CONTROL PANEL DESCRIPTION
The front LCD shows all the parameters measured by the instrument in a numeric format. The display
backlighting can be programmed to remain always ON or go OFF after a pre-set time (see section 8.4.4).
When the back lighting is OFF, it is automatically activated by pressing a key.
Hereafter, the main functions of the pushbuttons:
UP and DOWN key
a) In sequence, scroll all the available pages
b) In programming, change the value of the flashing figure (or group of
figures)
c) In programming, move the highlighted bar
d) In programming, pressed simultaneously insert the password
MENU key
a) Pressed for at least 2 seconds, display the General Menu
b) In programming, move the highlighted bar to the right-hand side figure
c) On Harmonics pages, switch from graphic to numerical view, or
viceversa
ENTER key
a) In programming, access to the parameter to be changed, or confirm
the set parameters
b) Pressed for at least 2 seconds, set the displayed page as Main Page or
delete the Main Page function from the displayed page
c) Pressed with MENU key simultaneously, display the Main Page (if it
was previously set)
8.2 INSTRUMENT SWITCHING ON
The instrument switches ON automatically when it is powered.
8.2.1 Initialization
At start-up, an Info page is displayed, showing the instrument name, the serial number and the firmware
release. After a few seconds, the instrument displays another page which summarize the set wiring mode
and the main parameters.
ATTENTION!
The displayed page shows the selected wiring diagram. Make sure that the carried out
connections correspond to the programmed wiring mode.
After 2 minutes from instrument switching ON, the Main Page is displayed (if it was previously set). Any
instrument page can be set as Main Page, menu and Setup pages excluded.
NOTE. The Main Page is identified by a symbol ( ) displayed on the left side of the instrument
LCD.

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8.3 GENERAL MENU
To display the General Menu, press for at least 2 seconds MENU key. To enter one of the following section,
move the highlighted bar to the requested item by means of UP or DOWN key and press ENTER key.
INSTANTANEOUS
Instantaneous values.
ENERGY COUNTERS
Energy counters.
DMD & PEAKS
Demand, peak and demand peak values of the main measurements.
HARMONICS (optional)
Graphics and tables showing the harmonic content of current and voltage.
SETUP
Instrument programming.
INFO
Operating conditions.
NOTE. The number and format of the displayed pages depend on the selected wiring mode
(see section 7.7), the instrument configuration and the additional functions (options). The
description in the manual refer to the instrument in a 3-PHASE 4-WIRE/3CT wiring.
8.4 SETUP MENU
It allows to program the device to fit to the application. This section describes how to access the Setup
menu.
Move the highlighted bar to SETUP by means of1. UP or DOWN key and
press ENTER key
When the password is requested, press2. UP and DOWN keys simultaneously.
The Setup menu will be displayed showing the following items:
MAIN
Main parameters setup. See section 8.4.1
COMMUNICATION
Serial communication setup. See section 8.4.2
DIGITAL OUT
Digital outputs parameters setup. See section 8.4.3
UTILITY SETUP
Contrast adjusting, backlight and language setup, counters reset.
See section 8.4.4
To exit from any Setup page, move the highlighted bar to PREVIOUS by means
of UP or DOWN key and press ENTER key. If a parameter has been changed
previously, a warning message will be displayed. The instrument requests
confirmation to save the new data.
Available choices:
YES• exit and save changes
NO• exit without saving
Continue• remain on the modified Setup page without exiting

15
To display the General Menu, from any Setup page, press MENU key for at least
2seconds.If a parameterhas beenchangedpreviously,awarningmessagewill
be displayed. The instrument requests confirmation to save the new data.
Available choices:
YES• exit and save changes
NO• exit without saving
Continue• remain on the modified Setup page without exiting
8.4.1 Main
It allows to configure the main operating parameters. To enter this section, move the highlighted bar to
MAIN by means of UP or DOWN key and press ENTER key. To set the parameters, see section 8.4.5
PT ratio
This function sets the ratio between the primary and secondary value of
the voltage transformer (PT) used on the system. The values are in range
1÷9999.
Note: for direct connection up to 750 VL-L Pt=0001
Example: For voltage transformer ratio 10kV / 100V, Pt = 0100
CT Ratio
This function sets the ratio between the primary and secondary value of the current transformer
(CT) used on the system (example: 1500A / 5A CT=0300). The values are in range 1÷9999.
WARNING
CT value is factory preset in case of instruments with Rogowski inputs. Do not change this
CT value otherwise the displayed current values will be incorrect.
NOTE. The CT and PT value setup allows to properly display the measured parameters, as
primary values, without the need to apply correction coefficients to the readings.
Current FS
This function allows to select between 2 nominal values for the current input. It allows to connect
to the instrument current transformers with 1 or 5 A secondary value.
Wiring
The available diagrams are:
3.4.3 - 3 phases, 4 wires, 3 CTs•
3.3.3 - 3 phases, 3 wires, 2 or 3 CTs•
3.3.1 - 3 phases, 3 wires, 1 CT•
3.2.1 - 3 phases, 2 wires, 1 CT•
1ph - 1 phase•
WARNING
Check carefully the correspondance between the wiring diagram selected on the meter
and the real wiring.
NOTE. For three-phase measurements, all parameters are shown only with the 3-phase
4-wire/3CT wiring. In all other cases the parameters without sense will not be displayed.
By wiring 3-wire/3-CT (without neutral) it is possible to connect the N terminal to ground.
In such a case it is possible to select the wiring 4-wire/3CT displaying all parameters. It is
recommended an efficient ground to reduce the measuring error. This suggestion cannot
be applied for IT systems, which are not referred to the ground.

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DMD Time (demand integration time)
This function allows to set the integration time for demand calculation.
8.4.2 Communication
It allows to set the communication parameters. To enter this section, move the highlighted bar to
COMMUNICATION by means of UP or DOWN key and press ENTER key. To set the parameters, see section
8.4.5
Protocol
The available protocols are:
STD• > STANDARD protocol
MDB• > MODBUS protocol (optional), selectable between:
MDB - ASCII= MODBUS ASCII
MDB - RTU= MODBUS RTU
MDB - RO= MODBUS Read Only
LONBUS• > LONBUS protocol (optional)
PROFIBUS• > PROFIBUS protocol (optional)
Baud rate
The communication speed is available as follows:
RS232/RS485 port: in range 300÷57600 bps•
LONBUS protocol: 78 kbps fixed•
PROFIBUS protocol: up to 12 Mbps•
Mode
The data communication format is available as follows:
STANDARD ASCII: selectable between 8N1, 8O1, 8E1•
MODBUS ASCII: 7E1 fixed•
MODBUS RTU: 8N1 fixed•
MODBUS RO: 8N1 fixed•
This field is not available in case of LONBUS or PROFIBUS protocol.
Address
The values are in range $01÷$FF for STANDARD protocol, $01÷$F7 for MODBUS protocol.
This field is not available in case of LONBUS or PROFIBUS protocol.

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8.4.3 Digital Out
The basic instrument is equipped with two digital outputs. To enter this section, move the highlighted bar
to DIGITAL OUT by means of UP or DOWN key and press ENTER key. It is displayed a list of the available
digital outputs. Press UP or DOWN key to make a choice and confirm with ENTER key. To set the parameters,
see section 8.4.5
NOTE. The number of programmable variables changes
according to the selected wiring mode.
Var
Variable associated to the output.
Mode
Output operating mode.
PULSE pulse emission. The pulse length is 150ms fixed.
HIGH maximum threshold. The output is activated when the
value of the selected variable is higher than the set
value.
LOW minimum threshold. The output is activated when the value
of the selected variable is lower than the set value.
NOTE. The HIGH and LOW selections cannot be used for
variables referring to energy.
Delay
This parameter changes according to the selected Mode as follows.
PULSE: pulse length, 150 ms fixed.
HIGH/LOW: output activation delay. Available values: 0; 0.03; 0.3; 1; 3; 10; 30; 100 s.
Hyst.
Threshold hysteresis. This value is expressed as percentage of the threshold value (0÷99%). The
hysteresis has no effect in PULSE mode.
Set
This parameter changes the meaning according to the selected Mode.
PULSE: pulse value expressed in Wh, varh or VAh.
HIGH/LOW: threshold value expressed as percentage of the full scale of the selected variable.
Available values in range 0÷150%
NOTE. According to the selected parameters (instantaneous values or energies) the meter
allows the proper setting (threshold or pulse) automatically.
Considerations on the pulse value calculation
The maximum pulse re-emission rate is 1 pulse/s (3600 pulse/h). The minimum value assignable to the pulse
to prevent the overlapping is:
emin = Pmax / 3600
Pmax is the maximum power on the measuring point controlled by the meter. The pulse value (emin) is
expressed in Wh, varh or VAh.
Example 1
Pmax = 5MW
emin = 5000000/3600 = 1389 Wh/pulse (1.389 kW/p)
Example 2
Pmax = 800kW
emin = 800000/3600 = 222 Wh/pulse (0.222 kWh/p)

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The result can be rounded off to a higher value for an easier calculation or totalization of the energy
consumption.
For example 1, it is possible to select 1.5, 2 or 10 kWh/p.
For example 2, it is possible to select 0.5 or 1 kWh/p.
The pulse emission frequency will be proportionally lower.
Higher pulse weight = lower emission frequency.
Considerations on the threshold value calculation
Full scale considerations: FSVLL=750V at Pt=0001; FSVLL=150V*Pt at Pt≠0001; FSA=1 or 5A at Ct=0001;
FSA=1 or 5A *Ct at Ct≠0001
Example 1
Parameter=A1; Ct=0001; FSA=1; selected threshold value= 60%
Absolute threshold value= FSA * Ct * 60% = 1 * 1 * 0,6 = 0,6 A
Example 2
Parameter=V1; Pt=0001; FSVLN=433V; selected threshold value=75%
Absolute threshold value= FSVLN * 75% = 433 * 0,75 = 324,75V
Example 3
Parameter=P; FSA=5A; FSVLL=150V*10; Ct=0100; Pt=0010; selected threshold value=45%
Absolute threshold value= (FSA * Ct * FSVLL * √3) * 45% = (5 * 100 * 150 * 10 * 1.73) * 0.45 = 583875
W = 583.8 kW
8.4.4 Utility Setup
This section allows to clear counters, adjust the contrast, set the backlight time and change the language.
To enter this section, move the highlighted bar to UTILITY SETUP by means of UP or DOWN key and press
ENTER key. To set the parameters, see section 8.4.5
Contrast Adjust
It defines the LCD contrast level. To modify this parameter, press ENTER
key when the highlighted bar is on CONTRAST ADJUST. To increase the
contrast press UP key, to decrease it press DOWN key.

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Clear Counters
This function allows to clear the energy counters. To reset the values,
press ENTER key when the highlighted bar is on CLEAR COUNTERS. The
instrument requests confirmation to clear data.
Available choices:
YES• reset data; before clearing, the instrument requests the password:
insert it within 5 s, pressing UP and DOWN keys simultaneously.
An Energy Counters page will be displayed
NO• data are not cleared. The previous Utility Setup page will be displayed
Clear DMD&Peak
This function allow to clear the DMD&Peak values.To reset the values,
press ENTER key when the highlighted bar is on CLEAR DMD&PEAK. The
instrument requests confirmation to clear data.
Available choices:
YES• reset data. A DMD&Peak page will be displayed
NO• data are not cleared. The previous Utility Setup page will be displayed
Backlight [s]
Display backlighting setup. It can be programmed in range 0÷999 s. When
the backlight is OFF, press any key to activate it. If it is set 0, the instrument
backlight is always ON.
Language
This function allowstoselectone of the availablelanguages forthe displayed
messages.
ENG• English
DEU• German
FRA• French
8.4.5 Pushbutton functions
The following procedure allows to set or modify the Setup values. From any Setup page:
Press1. ENTER key to enable the modification. The value or the first digit will start to flash
Press2. UP or DOWN key until the required value is displayed
Press3. MENU key to move the selection to another digit (or group of figures)
Confirm the value with4. ENTER key

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8.5 MENU STRUCTURE
The following page shows the General Menu structure. To enter any page, move the cursor to the requested
item and press ENTER key.