- 8
- Voltage detection inputs
- 280 VAC
- Maximum input voltage
- 5000 V
- Isolation from supply and bus
- RS485
- Modbus RTU
Overview
Where it works
SMU-3 is a DIN-rail controller that detects AC voltage from 70 to 280 VAC on eight inputs. It reports the state of every input over Modbus RTU on RS485 and shows it on an LED for that input. It runs on 9 to 36 VDC.
Mounting: 35 mm DIN rail (IEC 60715)
- Detecting voltage at different points in electrical cabinets
- Real-time monitoring that the required voltages are present in different parts of the circuit
- Remote monitoring of voltages in smart and SCADA systems
Datasheet
Technical data
Power supply
- Supply voltage
- 9 to 36 VDC
- Consumption
- max. 50 mA
Voltage detection inputs
- Number
- 8
- Maximum input voltage
- 280 VAC
- Minimum voltage for reliable detection of voltage present
- 70 VAC
- Maximum voltage for reliable detection of no voltage
- 30 VAC
- Input impedance
- 200 kΩ
- Maximum isolation voltage between inputs
- 1000 V
- Maximum isolation voltage between the inputs and the power supply and communication buses
- 5000 V
- Modbus scan period
- 800 ms
Communication
- Interface
- RS485
- Protocol
- Modbus RTU
Environment
- Operating temperature
- -20 to 60 °C
- Storage temperature
- -20 to 80 °C
- Relative humidity
- below 95 %, non-condensing
Status LEDs
- GreenOnInput voltage present for the module
- RedOnVoltage present on the corresponding input, above 70 VAC
- RedOffNo voltage on the corresponding input, below 30 VAC
Integration
Modbus registers
The full register map of the module. Filter by address, name or description.
Input registers
| Register | Name | Type | Description | Values | Default |
|---|---|---|---|---|---|
| 301 | Device type | uint16_t | Device type code, SMU-3 reads 1004 | 1004 | |
| 302 | HW version | uint16_t | Hardware version of the device | 010 = HW version 3.0 | |
| 303 | SW version | uint16_t | Software version of the device | 010 = SW version 3.0 | |
| 304 | Serial number high byte | uint16_t | Serial number of the device, high byte | ||
| 305 | Serial number low byte | uint16_t | Serial number of the device, low byte |
No register matches the filter.
Holding registers
| Register | Name | Type | Description | Values | Default |
|---|---|---|---|---|---|
| 401 | Device slave address | uint16_t | Modbus device address | 1 to 127 | 2 |
| 402 | MODBUS baud rate | uint16_t | Modbus communication baud rate | 0 = 9600 1 = 19200 2 = 57600 3 = 115200 | 0 |
| 403 | MODBUS parity | uint16_t | Parity check mode | 0 = 8N1 1 = 8E1 2 = 8O1 3 = 8N2 | 0 |
No register matches the filter.
Discrete inputs
| Register | Name | Type | Description | Values | Default |
|---|---|---|---|---|---|
| 100 | Input 1 | bit | Input 1, high voltage or low voltage | 0 = Low voltage 1 = High voltage | |
| 101 | Input 2 | bit | Input 2, high voltage or low voltage | 0 = Low voltage 1 = High voltage | |
| 102 | Input 3 | bit | Input 3, high voltage or low voltage | 0 = Low voltage 1 = High voltage | |
| 103 | Input 4 | bit | Input 4, high voltage or low voltage | 0 = Low voltage 1 = High voltage | |
| 104 | Input 5 | bit | Input 5, high voltage or low voltage | 0 = Low voltage 1 = High voltage | |
| 105 | Input 6 | bit | Input 6, high voltage or low voltage | 0 = Low voltage 1 = High voltage | |
| 106 | Input 7 | bit | Input 7, high voltage or low voltage | 0 = Low voltage 1 = High voltage | |
| 107 | Input 8 | bit | Input 8, high voltage or low voltage | 0 = Low voltage 1 = High voltage |
No register matches the filter.
Installation
Dimensions and connection
Systems
Used in
Street lighting
Street lighting management
Control and monitor street lighting cabinets from one system, with schedules that follow sunrise and sunset, measurements per phase and alarms for every cabinet.
Learn more
EIM
Electrical infrastructure monitoring
Sensors, analysers and a gateway turn a secondary substation into a monitored asset. The platform shows the transformer and the low-voltage board in real time, with alarms and reports for the grid operator.
Learn more
Transport, warranty and maintenance
- Transport and storage
- Protect the module from shocks and avoid extreme conditions. Store it in the original packaging.
- Warranty
- Two years from the date of manufacture against manufacturing defects. Modifications to the product after the publication date of its documentation release the manufacturer from liability. The manufacturer is not responsible for typographical or other errors in the documentation.
- Maintenance
- Under normal conditions the module needs no maintenance. Light dirt comes off with a dry or slightly damp cloth; for heavier dirt use non-aggressive cleaning products. Always disconnect the power supply first, keep liquids out of the housing and reconnect the power only when the module is completely dry.
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