Saci MTA36 User manual

MULTIFUNCTION POWER METER WITH LoRa
COMUNICATION
MTA36 USER MANUAL

MTA36 User Manual -1-
1. SAFETY PRECAUTIONS
The manufacturer is not responsible of the failure comply with the instructions in this
manual.
CAUTION:
Ensure that only qualified technicians work on the installation and maintenance.
Never work alone.
The electrical parameters supplied should be within the nominal range
Before any work with or on the equipment, isolate the voltage inputs and auxiliary
power supplies, cut the secondary of all CTs (current transformers), but never cut the
secondary of the PT. (Power Transformers)
Always use an appropriate voltage sensing device to ensure that everything is switched
off and that no voltage is present in any part of the equipment
Risk in the device
◆The voltage of the auxiliary power supply is outside the nominal range
◆The frequency of the power distribution system is outside the nominal range.
◆The input polarity of the voltage or current is connected incorrectly.
◆Remove or connect communication connections without switching off the device.
◆Connect the cables to the terminal contrary to the instructions.
"Danger" is used to warn workers that a danger
exists; if the "Danger" is ignored, it will cause
severe personal injury, death, equipment
damage or property damage.
"Warning" is used to indicate that death or
serious personal injury may occur if proper
precautions are not taken.

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2. ABOUT THIS MANUAL
This manual deals with the characteristics of the MTA36 measuring device in its
different versions and shows the necessary instructions for its correct installation and
start-up.
The differences between the versions are indicated by a letter and a number at the
end of the product description.
At the end of the manual you will find the ModBus register map necessary to
communicate with the equipment. However, this manual describes the configuration
and start-up of the equipment through the Saci software.
This software can be downloaded free from the Saci website (www.saci.es). To install
it, you only need to download and run the file. Once executed, follow the installation
instructions and you will have access to the application which you can communicate
with the equipment.
This manual assumes that user has knowledge about the network measurement
parameters and knows the measurement and power supply system’s where the
equipment will be installed.
If you have any questions about this user manual or the equipment, please contact
your local Saci distributor.

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INDEX
1. SAFETY PRECAUTIONS............................................................................................................... 1
2. ABOUT THIS MANUAL ............................................................................................................... 2
3. GENERAL DESCRIPTION............................................................................................................. 5
3.1 Models................................................................................................................................. 6
4. MEASUREMENT......................................................................................................................... 6
4.1 Measure parameters through the user interface: .............................................................. 7
4.1.1 Network parameters .................................................................................................... 7
4.1.2 Energy........................................................................................................................... 7
4.1.3 Harmonics .................................................................................................................... 8
4.1.4 Network quality............................................................................................................ 9
4.1.5 Demand........................................................................................................................ 9
4.1.6 Max/Min..................................................................................................................... 10
4.1.7 Average values ........................................................................................................... 10
4.1.8 Freezing Data.............................................................................................................. 11
5. INSTALLATION ......................................................................................................................... 12
5.1 Dimensions........................................................................................................................ 12
5.1.1 MTA36L ...................................................................................................................... 12
5.1.2 MTA36R...................................................................................................................... 12
5.1.3 MTA36F ...................................................................................................................... 12
5.1.4 MTA36-IFLORA ........................................................................................................... 13
5.2 Assembly ........................................................................................................................... 13
5.2.1 Single-phase device assembly:................................................................................... 13
5.2.2 Three phase device assembly: ................................................................................... 14
5.2.3 Communication module assembly:............................................................................ 15
6. CONFIGURATION..................................................................................................................... 17
1º Connect to the device..................................................................................................... 17
2º Basic Configuration......................................................................................................... 17
3º Configuration of the tariffs. ............................................................................................ 19

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4º LoRa configuration.......................................................................................................... 20
5. Module (only for MTA36-IFLORA)................................................................................... 22
7. TECHNICAL SPECIFICATIONS ................................................................................................... 24
7.1 MTA36 Meters: ............................................................................................................. 24
7.2 MTA36-IFLORA: ............................................................................................................. 26

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3. GENERAL DESCRIPTION
The MTA36 measuring transformer stands out because of its easy installation and the
high number of network parameters it can measure. These measurement power
meters are designed for the calculation and measurement of the electrical variables,
voltage, current, frequency, power, power factor, energy, harmonic components,
etc. of a power distribution network. It is available for both single-phase and three-
phase measurement.
Its revolutionary design brings together in the same device the instrument transformer
and the meter, which together with its communication options create a versatile and
easy-to-install device.
DEVICE
It consists of a main transformer on which communications are concentrated
and two auxiliary ones (in three-phase network's case) that communicate the
measurements to the main transformer.
Possibility of wireless communication through LoRa, making installation even
easier and saving costs.
LED indicators for connection and communication.
Insulation piercing installation system for the voltage.
Open transformers that allow the installation of the equipment without
opening the circuit.
USER'S INTERFACE
Real-time data on all network parameters.
Available in several languages.
Intuitive design.
COMMUNICATIONS
ModBus-RTU communication protocol.
Possibility of communication through RS-485 network (up to 9600 bps).
Possibility of wireless communication through LoRa (up to 9600 bps).
MEASUREMENTS
Measured in all 4 quadrants. Class 1.
Measurement of maximum and current demand.
Measurement up to the harmonic 31. Measurement of the harmonic distortion
of both voltage and current.

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Measurement of network unbalance.
TARIFFS
Up to 4 fully configurable tariffs.
Consumption of the current month, the previous 12 months and total
consumption.
3.1 Models
Model
Description
MTA36L1
Single-phase power meter with LoRa communications
MTA36R1
Single-phase power meter with RS485 communications
MTA36L3
Three-phase power meter with LoRa communications
MTA36R3
Three-phase power meter with RS485 communications
MTA36F3
Auxiliary transformer
MTA36-IFLORA
RS-485/LoRa communication module
4. MEASUREMENT
Voltage
Current
Power
Power factor
Frequency
Demand
Energy
Total harmonic distortion
Imbalance
Contact point temperature
The following list shows the variables that can be measured including relative variables
calculated from the basic electrical parameters:
Measurement variable
Instant
Máx
Mín
Demand
Average
Sum
Units
V1 V2 V3
√
√
√
√
[V,kV]
V12 V23 V31
√
√
√
√
[V,kV]
I1 I2 I3
√
√
√
√
√
[A,kA]
F
√
√
√
√
[Hz]
P P1 P2 P3
√
√
√
√
√
[kW,MW,GW]
Q Q1 Q2 Q3
√
√
√
√
[kvar,Mvar,Gvar]
S S1 S2 S3
√
√
√
√
[kVA,MVA,GVA]
PF PF1 PF2 PF3
√
√
√
√
-
EP+ EP-
√
[kWh,MWh,
GWh]

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4.1 Measure parameters through the user interface:
4.1.1 Network parameters
The device measures the voltage, current, frequency, power and power factor of each
phase and of the system.
4.1.2 Energy
The device supports excellent energy measurement functions such as the following:
Bi-directional energy measurement.
Four quadrants of reactive energy measurement
Metering of tariff energy (CDU)
All energy values are calculated on the basis of the secondary value; whose minimum
resolution is 1WH of 1varh. Whenever the device is connected, the primary energy
value increases or decreases at the rate of 1Wh(1varh). Users can reset the energy
data through the application according to specific needs.
EQ1 EQ2 EQ3 EQ4
√
[kvarh,MvarhGvarh
]
Energy storage
√
THDV1 THDV2 THDV3
√
[% ]
THDI1 THDI2 THDI3
√
[% ]
Harmonics RMS-U (1-31th)
√
[% ]
Harmonics RMS-I (1-31th)
√
[% ]
Unbalance-U
√
[% ]
Unbalance-I
√
[% ]
Puncture temperature
√
ºC

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The device supports the tariff energy measurement of four time zones at most. There
are two fully configurable tariff days that can be set for all 12 months of the year.
4.1.3 Harmonics
The instrument supports network harmonics (2-31st) RMS value. It also measures
harmonic distortion and voltage and current unbalance.

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4.1.4 Network quality
The device measures the phase angle of voltage and current. The phase angle of
voltage and current of each phase is shown. The phase angle of A phase voltage is
default set to 0°. The phase angle of other types of signals is shown in relation to the A
phase voltage (unit: °). It also measures the voltage deviation and frequency.
4.1.5 Demand
The instrument supports independent demand logging channels that can measure the
maximum demand value and the present value of both current and power. It is
possible to reset the maximum demand from the application.

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4.1.6 Max/Min
When the measured value is the maximum or minimum value, in an instant, the
instrument will record this value in the non-volatile memory.
These maximum or minimum values include three-phase voltage, line voltage,
frequency, three-phase current, total and three-phase active power, total and three-
phase reactive power, total apparent power and the total power factor.
It is possible to reset these values through the application.
4.1.7 Average values
The device records the average value of voltage, current, frequency, power and power
factor of each phase and of the system.

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4.1.8 Freezing Data
The device is capable of recording the active power of each phase and total; and the
active energy imported from each phase and total each a certain time, which is
adjustable by the user through the configuration menu.

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5. INSTALLATION
5.1 Dimensions
5.1.1 MTA36L
5.1.2 MTA36R
5.1.3 MTA36F
The length of the cable connecting the MTA36F with the communication cable is 1m.
∅
36
92
64 618.5 71
20
92
64 618.5 71
13
∅36
∅
36
90
64 618.5 71

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5.1.4 MTA36-IFLORA
5.2 Assembly
5.2.1 Single-phase device assembly:
1
Connect the N line to the
Un wiring hole. Use the
insulated piercing
connector for that.
2
Open the puncture
transformer, and connect
the transformer to the
cable and close the
transformer and tighten
screws.
Make sure that the
current direction of the
cable is consistent with
the arrow on the
transformer.
N

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3
Tighten the puncture knob
until the red power
indicator on the
transformer is lit.
5.2.2 Three phase device assembly:
1
Connect the N line to
the Un wiring hole of
the puncture
transformer, and
tighten the N line
wiring hole fastening
screws. Use the
insulated piercing
connector for that.
2
Open the puncture
transformer, and
connect the
MTA36L3 to the L2-
phase cable and close
the transformer and
tighten screws.
Make sure that the
current direction of
the cable is
consistent with the
arrow on the
transformer.
3
Connect two
MTA36F3
transformer to the
L1-phase and L3-
phase cables
respectively, and
connect the lead wire
to the corresponding
wiring port of the
SDT13.
N
N
L2
N
L2L1 L3

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4
Tighten the puncture
knobs until the red
power indicator lights
on L2 transformer are
lit.
Note: In the field installation, it is recommended to use insulating gloves to operate to
prevent electric shock
If the cable diameter is small, the cable can be fixed with a tie.
5.2.3 Communication module assembly:
To ensure proper operation of the device, please avoid placing it near high-powered
electrical equipment or equipment that can produce strong EMF signals, as this
equipment may decrease the transmission power or transmit a poor quality signal.
35mm standard DIN-rail
N
L2L1 L3

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Diagram connexion:
*RS485/USB interface available for connection to PC

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6. CONFIGURATION
Once the device is installed, the application is downloaded and the communication is
made, the device has to be configured according to its installation:
1º Connect to the device.
To communicate with the instrument through the ModBus protocol it is necessary that
the instrument has an identity (by default all the instruments have the identity 1)
When connected to the RS485 model, it can be connected via a COM port or via
TCP/IP. In this case you must enter the IP address and port.
Once connected, just press the close button and enter the configuration menu
2º Basic Configuration.
In the configuration menu we enter the basic configuration menu and introduce the
network parameters. Here we can change the identity of the equipment (max 247)*,
the freezing data refresh time and the voltage and current input value.

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The equipment does not have RCT (Real Clock Time), but the time can be introduced.
By pressing the synchronize button, the device will take the date and time from the
computer to which it is connected (as it does not have RCT, the time can be delayed, it
is advisable to synchronize the device from time to time for its correct operation,
mainly in tariff mode).
For the demand side configuration, the energy demand is calculated using the
arithmetic integration of the power values over a period of time divided by the length
of the period. The result is equivalent to the energy accumulated during the period of
time divided by the length of the period.
The current demand is calculated using the arithmetic integration of the rms current
values over a period of time divided by the period length.
The duration of the intervals for calculating the demand is taken care of by the
equipment. Several methods can be implemented:
Fixed block interval (fix): the intervals are consecutive, the power meter calculates and
updates the demand at the end of each interval.
Note: 15min is only an example.
Sliding block interval (slip): the intervals are sliding. The equipment calculates and
updates the demand at the slip rate.
Note: 15min is only an example.
Relative time parameters are set as t (slip time, unit: minutes) and T (slip block
interval, unit: minute)

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Fixed interval mode means that the average demand value in T minutes is calculated
for each T block, and then the value is recorded. A month's demand is automatically
recorded at a fixed time.
Sliding interval mode means that the average demand value of the last T minutes is
calculated, and then the value is recorded. The demand of a month is automatically
recorded at a fixed time.
*RS485 version:
For the RS485 version, the MTA36R, the modbus identity is configured differently. A
table with the different identities according to the position of the tab at the top is
shown below:
TAB POSITION
MODBUS IDENTITY
0
User-defined
1
2
2
1
3
3
4
8
5
10
6
9
7
11
8
4
9
6
A
5
B
7
C
12
D
14
E
13
F
0
To change the identity of the 0 position it is necessary to write it from position F. To do
this:
1. The tab is positioned in position F.
2. Using the software, the device is connected with the identity 0.
3. Enter the Configuration->Basic configuration menu.
4. Enter the desired identity and press the save button.
5. In the software, the communication with the device is cut off.
6. The tab is changed to position 0.
7. Using the software you connect the device with the desired identity.
3º Configuration of the tariffs.
It is possible to configure two different tariff days with time intervals and up to 4
different tariffs.
It is also possible to configure which day of the tariff is each month.