MDM3001S multifunction meter
The MDM3001S multifunction meter is a modular digital multifunction meter for panel mounting in industrial power distribution and machine-level monitoring. It measures voltage, current, neutral current, frequency, apparent, active and reactive power, power factor, and both kWh and kvarh energy. The modular design allows the unit to be configured for the interfaces a panel actually uses: RS-485 Modbus communication, analog output, digital input, and multi-tariff energy metering. The meter meets IEC61000, IEC1010 and EN61010 for EMC and safety isolation, and is stated in the manufacturer's documentation to be developed, manufactured and tested under an ISO 9001 quality assurance system.
This page is written for electrical engineers and plant buyers who need to confirm that the device fits an existing Modbus network and a metering scheme. The notes below describe what the instrument measures, how it is configured, and where it is typically applied. Final wiring, CT ratio and tariff configuration are project-specific; confirm them against the datasheet before ordering.
What it measures and does
The device is a true multifunction instrument in the sense that one unit covers the electrical quantities normally split across several single-function meters. The measured set is:
- Voltage (U) and current (I), including neutral current (In) — the neutral channel is relevant on systems with significant single-phase or non-linear load, where neutral current can approach or exceed phase current.
- Frequency (F) — useful where generators, inverters or weak grids make frequency stability part of the acceptance criteria.
- Apparent power (S), active power (P), reactive power (Q) and power factor (PF) — the quantities used to assess load composition and to size correction or transformer capacity.
- Energy: kWh and kvarh, which support consumption reporting and reactive-energy accounting.
Beyond measurement, the meter records maximum and minimum values, so transient excursions between operator rounds are retained and can be read back over the communication link. The RS-485 Modbus interface lets the MDM3001S multifunction meter act as a slave on an existing supervisory or energy-management bus rather than requiring a separate data logger. Analog output and digital input extend the interface set where the control system needs an analog signal or a status contact. Multi-tariff metering allows energy to be accumulated in separate registers, so consumption can be allocated to time-of-use or shift-based periods.
Key features
- Single device for U, I, In, F, S, P, Q, PF, kWh and kvarh — one panel cut-out instead of several meters.
- Modular design: interface and function options are selected to match the installation.
- RS-485 Modbus communication for integration with PLCs, gateways and energy-management software.
- Max/min value recording for later analysis of excursions.
- Analog output and digital input as documented interface options.
- Multi-tariff energy metering for period-based consumption allocation.
- Compliance documentation to IEC61000, IEC1010 and EN61010 covering EMC and safety isolation.
- Stated in the manufacturer's documentation: manufactured and tested under an ISO 9001 quality assurance system.
For engineers specifying by function rather than by brand, the useful check is whether the measured set and the communication interface match the point list of the panel. A digital multifunction meter that already carries the required parameters and a Modbus port avoids adding transducers and signal conditioning.
Specifications
| Model | MDM3001S |
|---|---|
| Measured parameters | U, I, In, F, S, P, Q, PF, kWh, kvarh |
| Communication | RS-485 (Modbus) |
| Recording | Max/min value recording |
| Outputs / inputs | Analog output + digital input |
| Tariff | Multi-tariff metering |
| Standards | IEC61000, IEC1010, EN61010 (EMC and safety isolation) |
Values not listed above, including accuracy class, dimensions and display details, are not documented in this catalogue extract. Request the datasheet for the complete specification before finalising a design.
Options and configuration
The MDM3001S is offered as a modular platform, with the interface and function set selected at order. When configuring the unit, confirm the following against the datasheet and the point list:
- Communication: RS-485 Modbus parameters (address, baud rate, parity) must match the supervisory network; plan the bus topology and termination as for any RS-485 segment.
- Analog output: define the signal range expected by the receiving controller and the parameter it should carry.
- Digital input: define the status signal to be monitored and its voltage level.
- Tariff scheme: define the number of tariff periods and how switching is implemented in the installation.
- CT and VT ratios: set to match the installed instrument transformers so that primary values and energy registers read correctly.
Applications
The instrument suits low-voltage distribution panels, machine control cabinets and sub-metering points where several electrical parameters must be available on a common bus. Typical uses include:
- Incoming and outgoing feeder monitoring in industrial distribution boards.
- Energy and reactive-energy accounting across departments, buildings or production lines.
- Power-quality screening: PF, Q and neutral current readings help identify poor load composition before a dedicated analyser is deployed.
- Retrofit metering where an existing Modbus network can accept another slave device.
FAQ
Does the MDM3001S measure neutral current?
Yes. Neutral current (In) is part of the measured parameter set, together with U, I, F, S, P, Q, PF, kWh and kvarh.
Can the meter be connected to an existing Modbus network?
Yes, it provides RS-485 Modbus communication. Confirm that address, baud rate and parity settings can be matched to the network, and follow standard RS-485 wiring and termination practice.
Which standards does the product documentation reference?
The documented standards are IEC61000, IEC1010 and EN61010, covering EMC and safety isolation. The meter is stated in the manufacturer's documentation to be developed, manufactured and tested under an ISO 9001 quality assurance system.
Can energy be recorded in separate tariff periods?
Yes. Multi-tariff metering is a documented function, allowing energy to be accumulated in separate registers for period-based allocation.
For the full datasheet, wiring diagrams and ordering information on the MDM3001S multifunction meter, contact the LOGGON TECH sales team through the contact page and state the interface options your project requires.