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Preface
LoRaWAN mME DTZ541, it is a new innovative product that was developed for the German market. The meter has 2 communication channels "LoRaWAN" and "LoRa". With the LoRaWAN network, the meter can regularly send the defined measurement data to the server. In addition, the user can use a LoRa adapter to query all measurement data from the meter at any time and also set all parameters.
As the "modern measuring device", the meter meets all legal requirements as well as standards and normative documents. The main ones are listed in the following table:
| Norm | Explanation |
| IEC 62052-11 | AC electricity meters - General requirements, tests and test conditions - Part 11: Measuring devices |
| IEC 62053-21 | AC Electricity Meter - Special Requirements. Part 21: Electronic active consumption meters of accuracy classes 1 and 2 |
| IEC 62056-21 | Electricity metering - Data exchange for meter reading, tariff and load control - Part 21: Direct local data exchange |
| SML 1.04 | SML – Smart Message Language |
| EN 50470-1 | AC electricity meter; General requirements, tests and test conditions - measuring equipment (accuracy classes A, B andC); German version EN50470-1: 2006 Correction to DIN 50470-1 (VDE 0418-0-1): 2007-05 |
| EN 50470-3 | ALTERNating current electricity meter; Special requirements - Electronic power consumption counters (accuracy classes A, B and C); German version EN 50470-3:2006 |
| DIN 43857-2 | Electricity meter in insulating housing for direct connection up to 60 A limit current Main dimensions for three-phase meters |
| EN 60999-1 | Connection material - Electric copper conductors; Safety requirements for screw terminals and screwless terminal points - Part 1: General requirements and special requirements for terminal points for conductors from 0.2 mm2 up to and including 35 mm2 |
| Richtlinie 2014/32/EU | DIRECTIVE 2014/32 / EU OF THE EUROPEAN PARLIAMENT AND OF THE COUNCIL of February 26, 2014 on the harmonization of the laws of the member states regarding the making available of measuring instruments on the market |
| Lastenheft Funktionale Merkmale | VDE / FNN instructions, specifications for basic meter functional features, version 1.3 (11/2016) |
| Lastenheft EDL | VDE / FNN specifications EDL electronic household meters, functional features and protocol, version 1.2 (11/2016) |
General
Device versions
This chapter lists options for the DTZ541 type electricity meter. These options then map a complete type designation of the meter. The individual meter can be defined by specific, clear characteristics such as maximum electricity, the tariff or the data interface. With the additional type number you can fully define the version of the DTZ541 three-phase energy meter.
| Nr. | Norm | Explanation |
| 1 | Three-phase electricity meter | DTZ541: Design |
| 2 | Current direction | B: Reference counter with backstop L: Delivery counter with backstop Z: Bidirectional counter S: Delivery counter, balancing without backstop |
| 3 | Rates | D: Double rates E: Single rate |
| 4 | MSB- PIN | B: RS485 C: RS232 |
| 5 | Accuracy | A: class A B: class B L: LoRaWAN + class A |
The type of current direction is permanently configured as the factory setting and may no longer be changed during use. The double tariff function can be set in the same way as other functions specified in the FNN specification sheet for basic meters. The measuring device user can activate or deactivate via the LMN interface with the communication adapter "BAB-01".
Housing element
| Nr. | Explanation | Nr. | Explanation |
| 1 | LED Pulse output | 6 | Control button for switching the display and entering the PIN |
| 2 | Optional extension of the upper attachment | 7 | Sealable housing cover |
| 3 | Two-line display | 8 | User security can be secured with a wire seal |
| 4 | Housing cover protection under calibration law | 9 | Terminal cover |
| 5 | INFO customer PIN |
Nameplate
| Nr. | Explanation | Nr. | Explanation |
| 1 | LED- Pulse constant | 2 | Logo from manufacturer |
| 3 | AC electricity meter | 4 | Three-phase four-wire meter |
| 5 | Protection class III | 6 | Information on the type of measurement |
| 7 | operation manual | 8 | Temperature range |
| 9 | Circuit diagram | 10 | Construction year |
| 11 | Manufacturer's address | 12 | Unique identification number according to DIN 43863-5 |
| 13 | Server ID | 14 | Measurement accuracy |
| 15 | Connection conditions | 16 | Material number by the customer |
| 17 | Design | 18 | Number of the EC-type examination certificate |
| 19 | CE- Conformity mark | 20 | OBIS Code and register |
Technical Data
| Features | Explanation |
| Connection type | Dreiphasen-Vierleiter / Einphasen-Wechselstrom |
| frequency | 50Hz |
| Rated voltage | 3 * 230/400 V 1*230V auf L1, L2, L3 |
| Current Imin-Ib(Imax) | 0,25-5(100) A or 0,25-5(60) A |
| Starting current | 0.004*Ib=0,02 A |
| Transient current (Itr) | 10%*Ib=0,5 A |
| Surge voltage resistance | 6 kV, IEC 62052-11 |
| Short-circuit strength | 30Imax, IEC 62053-21 |
| Power consumption | Current path: <0,2VA Voltage path: <0,5W |
| Measurement accuracy | Class A (EN50470-1-3) or Class2.0 (IEC62053-21) |
| LED pulse output | 500 or 5 000 or 10 000 Imp/kWh |
| Metrology | Current direction +A: (Single rate) only 1.8.0; (Double rate) Change between1.8.1 and 1.8.2 Current direction A: 2.8.0 (Double rate) Substitution between 2.8.1 and 2.8.2 |
| External rates switching control (with double rate meters) | Clamp 13 u. 15 |
| LC-Display | Format: Two lines Viewing angle: 15° (from above) and 60° (from left, right, down) Digit dimensions in the range of values: 3,5mm * 8mm (min.) Digit dimensions in the code area: 1,9mm * 4,2mm (min.) |
| Mechanical environmental conditions | M1 |
| Electromagnetic environmental conditions | E2 |
| Protection class | IP51 |
| Relative humidity | 95% non-condensing, <75% annual mean according to IEC 62052-11, EN 50470-1 and IEC 60068-2-30 |
| Temperature range | -25°C... + 55°C (operation) -40°C... + 70°C (storage) |
| lifespan | 20 years |
| User protection | 2 security options for seal |
| Terminal block | DIN 43857 part 2 |
| Clamps ∅ | 9,5mm |
| casing material | Glass fiber reinforced polycarbonate |
| Size | 290,5 mm (L) * 170 mm (W) * 52,5 mm (H) |
| Weight | 720g |
Test-LED
The test LED of the DTZ541 illuminates the infrared light. It is used to output energy-proportional active energy pulses and to display start-up and idling. When idling, the test LED lights up continuously. If the meter measures above its start-up threshold, the energy-proportional pulses are displayed. The accuracy of the DTZ541 is determined by the LED pulse outputs.
Notes on measurement accuracy
Only the specified meter types with the associated software version numbers are permitted for use of the LMN interface in accordance with calibration law. For this purpose, the respective approved software versions must be observed. The measured value data have a resolution of 4 decimal places. All parties involved must ensure that the requirements from PTB-A 50.8, Appendix A3 for latency times and applicable tariff application cases are complied with, also taking into account several communication adapters connected to a smart meter gateway.
Assembly
Attachment and connection
Before installing and commissioning the meter, check whether the meter is damaged. please check whether the meter is damaged. If you detect any damage to the housing or a missing legal metrological fuse, the meter must not be used if the seals are missing or the housing is damaged. The DTZ541 three-phase energy meter is suitable for mounting on a meter position in accordance with DIN VDE 0603-2-1, three-point attachment DIN 43857-2 and should be connected according to the circuit diagram.
Dimension
Rates control
The rates control is carried out regulated by potential-free rates control terminals 13 and 15. With the double rates meter, the rates can be switched by activating the terminals with system voltage by a rates control device. Without control, rates 2 is active. rate T1 is activated when voltage is applied to terminal 13.
Terminal block
In order to ensure a secure electrical connection between connecting cables and terminals, the clamping screws must be tightened with a corresponding torque in accordance with DIN EN 60999-1. Tighten the terminal screws with a corresponding torque in accordance with DIN EN 60999-1 to ensure a safe electrical connection between the connecting cables and to ensure the terminals. The meter has tinned copper shunts and can be contacted directly on copper or aluminum lines. The suitability of the meter for connection is indicated on the meter.
Variant 60A (cage terminal block)
Variant 100A
| Variant 60A/100A | Phase Clamps 1, 3, 4, 6, 7, 9, 10, 12 | Voltage / N tap 2, 11 | Additive - Clamps 13, 15, 27, 28 |
Clamps  (mm) | 9,5 | 3,0 | 3,0 |
| Min. Connection cross-sections (mm²) | 6 | 1,5 | 1,5 |
| Max. Connection cross-sections (mm²) | 35 | 2,5 | 2,5 |
| Prescribed tightening torque (Nm) | 1,5...2,5 | 0,5 | 0,5 |
| Kopf | PZ2 | Kreuzschlitz | Kreuzschlitz |
| Thread size | M6 | M3 | M3 |
LC-Display
LCD- Segments
The meter has an LC display with additional symbols to identify measured values and working conditions.
| Nr. | Explanation |
| 1 | Active tariff display |
| 2 | OBIS code of the labor value |
| 3 | Display of meter reading |
| 4 | Unit for meter reading |
| 5 | Phase control |
| 6 | Energy direction |
| 7 | Direction of flow of the measured energy |
| 8 | simulates carrier |
| 9 | Unit for voltage, current or apparent power |
| 10 | Symbol for communication via the electrical data interface |
| 11 | Unit for performance or historical values |
| 12 | Display of current performance or info |
| 13 | Abbreviation of "Day" for historical values |
| 14 | Information content icon |
| 15 | Info display icon |
Display of operation
The display test for 15 seconds when the voltage is restored. Upper display line segments and lower display line segments alternately fade in and out 3 times.
The software version number of the metrological part is shown on the display with the associated checksum. The software version is indicated with index 1.
If a communication adapter "BAB-01" is connected, the display then shows its software version number and the associated checksum. The software version is indicated with index 2.
Rolling display of billing-relevant values. The display of the instantaneous power in the second line must be enabled by entering a PIN:
Variant of single tariff for current direction + A: only register 1.8.0
Double tariff variant for current direction + A: alternating display between registers 1.8.1 and 1.8.2
Variant of individual tariff for current direction -A: only register 2.8.0
Double tariff variant for current direction -A: alternating display between registers 2.8.1 and 2.8.2
The 6 register values 1.8.0, 1.8.1, 1.8.2, 2.8.0, 2.8.1 and 2.8.2 are relevant for billing. They are always shown in the same way as the variant in the first line of the display and only kWh without decimal places.
After entering the PIN, all the values shown in the second line are for customer information only and may not be used for billing-related purposes. This applies in particular to the instantaneous power, the historical consumption values (1d, 7d, 30d, 365d), as well as consumption values since zero setting.
If an error is detected which means that the measured values can no longer be used for accounting, the display shows this message for 2 seconds after each partial step of the information to be displayed on a rolling basis.
PIN
INFO PIN
An optical data interface on the front is available for the end user. Its constant data rate is 9600 baud and the character encoding is 8-N-1. The transmission protocol is according to SML specification version 1.04. The interfaces work in
"PUSH" mode and send out one data record every second. The data has 3 variants. If you do not enter a PIN for the "INFO OFF" setting, it is the "Reduced data record", otherwise it is the "Complete data record". The "manufacturer specific data record" can also be activated or deactivated via the rear interface.
Record to the INFO-PIN
| Reduced data set | Complete data set | Manufacturer-specific data record |
|
|
|
MSB PIN
DTZ541 has an MSB interface from terminals 27 and 28. Its constant data rate is 9600 baud and the character coding is 8-N-1. The transmission protocol is RS485 according to SML specification version 1.04. The interfaces work in "PUSH" mode and send out a manufacturer-specific data record every second.
LMN PIN
The MSB interface can be expanded as the LMN interface with the Holley communication adapter BAB-01. Its constant data rate is 1Mbit and the character encoding is 8-N-1. The LMN interface meets the requirements of the FNN specification sheet for basic meters, the PTB requirements for communication adapters PTB-A50.8 and the requirements of BSI TR03109. This LMN interface can communicate directly with SMGw.
Tariff control
For the DTZ541 with double tariff function, the tariffs may be activated and controlled via terminals 13 and 15 or via the LMN interface. Control via the LMN interface has priority over the control signal supplied to the control terminals. If the activation via the LMN interface is recognized and there is no further activation for a period of more than 90s, the priority status is canceled again and activation via control terminals is used. If the DTZ541 is in the operating mode "Operation in a secure SMGw environment", the dual tariff function must be set to the "suppressed" state for all energy directions.
Configuration of the dual tariff function
Another register with data type "Unsigned8" and class "Data" must be included under the code numbers (01 00 5E 31 01 0D). This can be written as well as read. Writing automatically deactivates the dual tariff function. Writing with impermissible bit combinations must be answered with the attention "81 81 C7 C7 FE 05". The permitted bit coding and corresponding functions are described in the following table.
| Task | Bit7 MS B | Bit6 | Bit5 | Bit4 | Bit3 | Bit2 | Bit1 | Bit0 LSB |
| DTF prepared in energy direction "1.8..." | 1 | |||||||
| DTF "1.8..." suppressed in energy direction | 0 | |||||||
| DTF prepared in energy direction "2.8..." | 1 | |||||||
| DTF suppressed in energy direction "2.8..." | 0 | |||||||
| Assignment "LMN tariff control ON" Or Register "... 8.1" is active | 1 | |||||||
| Assignment "LMN tariff control ON" Or Register "... 8.2" is engaged | 0 | |||||||
| reserved | 0 | 0 | 0 | 0 | 0 |
LMN command for tariff switching
Another register with data type "Boolean" and class "Data" must be included under the code numbers (01 00 5E 31 01 0C). This can be written as well as read. Writing (TRUE or FALSE) automatically activates the dual tariff function. The letter is to be ignored (and answered with the attention "81 81 C7 C7 FE 05") if at least one double tariff function is not in the "prepared" state. If the double tariff function is "prepared" and has been activated, the double tariff function remains in the "prepared and activated" state even after the operational readiness has been lost (loss of mains voltage) and can only be reset in accordance with Configuration of the dual tariff function Section.
Operation of the counter with the key
DTZ541 has a physical button and, optionally, an optical button in the position of the INFO interface. By entering a "short key press" and a "long key press (5s)" additional information is shown in the second line of the display. The corresponding functions can be set here. The different key commands are:
short key press (<2s)
repeated short keystrokes
long press (>5s)
The following explanation describes the operating processes of a complete counter. Some steps are not possible with some meters due to different variants. For example, a reference meter does not have historical values of "-A".
When the historical values are displayed, the scrolling mode is interrupted in the first line and the corresponding OBIS code for the historical values is displayed. This enables the historical values to be clearly assigned to the respective type of energy.
Operating status from the display
Displaytest
PIN- input
Enter the 4 digit of the pin
If the PIN is correct, the display then shows the performance
If the PIN is not correct, the display shows the operating mode
historical value "+ A" since the last reset
historical value "- A" since the last reset
Setting of the deletion of the historical value "+ A" and "-A" since the last reset
historical daily value "+ A"
or Activation of the delete function
delete historical value "+ A" and "-A" since the last reset
historical daily value "+ A"
historical weekly value "+ A" to call up 730 individual daily values "+ A"
Or
second historical daily value "+ A"
display all 730 daily values "+ A"
Deactivating the inspection of the daily value "+ A"
historical weekly value "+ A"
historical monthly value "+ A" or 
104 historical weekly values "+ A" can be viewed
historical annual value "+ A" or 
24 historical monthly values "+ A" can be viewed
historical daily value "-A" or 2 historical annual values "+ A" can be viewed
historical weekly value "-A"
Or 730 historical daily values "-A" can be viewed
second historical historical daily value "-A"
all 730 daily values "-A" can be viewed
Deactivating the inspection of the daily value "-A"
historical weekly value "-A"
historical monthly value "-A" or 
104 historical weekly values "-A" can be viewed
historical annual value "-A" or 
24 historical monthly values "-A" can be viewed
Setting the deletion of historical values "+ A" and "-A" or 2 historical annual values "-A" can be viewed
State of the INFO PIN
or 
Activation of the delete function
historical value "+ A" and "-A" to be deleted
State of the INFO PIN
State of the PIN input
or Activation of the setting of the INFO-PIN
Status of the PIN input
to stop displaying the additional information
or 
to set the PIN entry as "off" in order to call up the additional information again
to stop displaying the additional information
to call up the additional information again
LoRaWAN Function
This chapter describes the payload from the Holley LoRaWAN electricity meter. There are two messages in the log, "Meter Reading Message" (MRM) is sent regularly by the meter and "Meter Control Messages" (MCM) is sent by the LoRaWAN server.
Meter Reading Message (MRM)
| Size (Byte) | 1 | [0..30] |
| Part | MRMHDR | content |
Meter Reading Message Header (MRMHDR) is defined as
| Bit# | 7..6 | 5..1 | 0 |
| part | execution | Identifier | State |
Execution
| execution Bits | description |
| 00 | LoRaWAN Meter Protocol V1 |
| 01..11 | RFU |
Identifier
| Qualifier Bits | Counter types | description |
| 00000 | None (if only the status is send) | |
| 00111 | mME-DTZ541 | Data record-1 from the mME counter |
| 01000 | Data record-2 from the mME counter | |
| 01001... 11111 | RFU | |
Data record-1 from the mME counter
| Bytelength | 14 | 3 | 2 | 4 | 2 |
| Content | Conter number | Counter firmware version | Counter firmware checksum | Adapter firmware version | LoRaModulfirmware-Version |
Data record-2 from the mME counter
| Bytelength | 5 | 5 | 5 | 5 | 5 | 5 | 3 | 3 | 3 | 3 | 4 | 4 |
| Content | 1. 8. 0 | 1.8.1 | 1.8.2 | 2.8.0 | 2.8.1 | 2.8.2 | Psum | PL1 | PL2 | PL3 | Status word | Second index |
RFU: Reserved for future use
Status
| Status-Bits | description |
| 0 | Not OK, so serious errors within the metrological part of the measuring device |
| 1 | Meter operation OK |
"Not Ok" can only be sent whenever a counter reading can be send, but is not accessible.
HEX-Code conversion
5 byte consumption value ( unit 0,1Wh):
E.g. 000000FFFF interprets 65,535 * 0.1 * Wh = 6553.5 Wh = 6.5535 kWh
3 byte consumption value ( unit 0,1W):
e.g. 0000FF interprets 255 * 0.1 * W = 25.5 W.
example
Payload from the counter:
1100000623CD00000623CD000000000000000000000000000000000000000000006100000000006
10000000008010400483A68
Explanation from the payload:
Consumption value _1.8.0: "40.2381 kWh",
Consumption value _1.8.1: "40.2381 kWh",
Consumption value _1.8.2: "0 kWh",
Consumption value _2.8.0: "0 kWh",
Consumption value _2.8.1: "0 kWh",
Consumption value _2.8.2: "0 kWh", p
ower _PSum: "9.7 W",
power _PL1: "0 W",
power _PL2: "9.7 W",
power _PL3: "0 W",
Second index: 4733544,
Staus word: "00080104",
- "S08_ Measuring mechanism ": " Start-up ",
- "S09_ Magnetic_manipulation ": "No",
- "S10_ Terminal cover_Manipulation ": "NO",
- "S11_ Energy direction ": "+A",
- "S12_ Energy direction _L1": "+A",
- "S13_ Energy direction _L2": "+A",
- "S14_ Energy direction _L3": "+A",
- "S15_ Rotating field _L1_L2_L3": "Ja",
- "S16_ Backstop ": " inactive ",
- "S17_ Error_curification-relevant ": "No",
- "S18_ voltage _L1": " unavailable ",
- "S19_ voltage _L2": " available ",
- "S20_ voltage _L3": " unavailable "
Meter Control Message (MCM)
| Size(Byte) | 1 | [4] | [4] | [1] |
| Part | MCMHDR | Unconfirmed interval | Interval confirmed | Max Retries |
Meter Control Message (MCMHDR) defined as
| Bit# | 7 | 6 | 5 | 4 |
| Part | Version, Highbit | Version, LowBit | Send Readings | Send Now |
| Bit# | 3 | 2 | 1 | 0 |
| Part | RFU | RFU | RFU | RFU |
Execution
| Version Bits | description |
| 00 | LoRaWAN Meter Protocol V1 |
| 01..11 | RFU |
Send Readings
| Send Readings Bit | description |
| 0 | Off, do not send any uplink packets at the defined intervals until the bit is set to 1 again. No messages (neither confirmed nor unconfirmed) will be sent. The meter just keeps listening to new commands. |
| 1 | On, send readings at the defined intervals |
Send Now (To a single read, regardless of the sending interval)
| Send Now bit | description |
| 0 | Off, no need to send an additional meter reading in response to this message. |
| 1 | On, regardless of the other parameters, the electricity meter as soon as the duty cycle allows reading. Even if the "Send Reading Bit" is 0. |
Unconfirmed Interval
4 byte integer denotes the multiple of 1 minute long interval in which the meter readings are sent as an unconfirmed message (no confirmation expected). The default value is "F" (every 15 minutes) and the minimum value is "5" (every 5 minutes).
If "Send Readings" is switched off, the meter readings still send the message, omitting only readings (that is, only the header with the status bits). The unacknowledged message will only send if no acknowledged message is scheduled at the same time.
If an unacknowledged message and an acknowledged message are sent at the same time, then no unacknowledged message is sent because both intervals end.
A value of "0" means: does not send unacknowledged messages. A value "FFFF FFFF" has the special meaning of: no current setting changes for interval unconfirmed.
The interval begins when the meter is connected (request 4) and again when a meter control message with a value other than "FFFF FFFF" for unacknowledged interval is received. The first message is sent at the beginning of the first interval.
Confirmed Interval
The default value is 0 (once a week).
Max Wiederholungen
4-byte integer denotes the multiple of 15-minute intervals in which the meter readings are sent as a confirmed message (awaiting confirmation and retry if no confirmation is received). If "Send Readings" is switched off, the Meter Readings Message can still be sent, only with the omission of Reading.
1 byte integer specifies the maximum number of repetitions if no acknowledgment is received for a confirmed message. 0xFF means: no change. The default is 3.
Example
08000000050000000003: Change the interval of data record-2 as 5 minutes.
080000000F0000000003: Change the interval of data record-2 as 15 minutes.
07000000050000000003: Change the interval of data record-1 as 5 minutes.
LoRa Function
With the Holley LoRa adapter and super password, all parameters of the LoRaWAN function can be configured and the meter data can be read at any time.
Safety Instructions
Notice
The installation, installation and uninstallation of the meter may only be carried out by a certified electrician. For your own safety and to avoid damage to the device, please observe the following safety information. The information in the manual is important for your own safety in order to avoid damage. Please also comply with the generally applicable local safety regulations for electrical installations
Improper handling of live parts can lead to life-threatening injuries and accidents. Before starting the installation, the power must be switched off for the main circuit breaker. Incorrect labeling of fuses or circuit breakers can lead to the inadvertent shutdown of the wrong system. This would mean that the system being worked on would continue to be live. A suitable measuring device is used to check that there is no voltage.
Guarantee Notice
Damage to the meter may only be repaired by the manufacturer. The meter may not be repaired yourself if it is damaged. Claims under the guarantee can only be asserted if the prerequisite is that the meter is not opened and / or the seal is undamaged. All guarantee and warranty rights expire when the device is opened. The same applies to damage caused by external influences
The meter is maintenance-free.
Documents / ResourcesDownload manual
Here you can download full pdf version of manual, it may contain additional safety instructions, warranty information, FCC rules, etc.
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