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.