Maximum Demand Predictive Control

  • Demand management by disconnecting up to 6 non-priority local loads
  • Expandable until 54 loads with 12 LM4I/4O units through the RS-485 port
  • Modbus RTU communications or the impulse input
  • Synchronizing impulse input
  • Ethernet connection
  • Feedback load status control through the logic status of the inputs
  • Centralizing consumption by impulses
  • Disabling load management according to schedule
  • Simulation tool for verifying system operations

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Data Sheets & Downloads

MDC-20 (Maximum Demand Controller) Brochure (1.7 Mb) [PDF]
MDC-20 (Maximum Demand Controller) Brochure (1.9 Mb) [PDF]
MDC-4 (Maximum Demand Controller) Brochure (643.3 Kb) [PDF]
LM Series (Pulse Modules) Brochure (2 Mb) [PDF]

Product Description

The MDC-20 is a unit designed to control the maximum demand of an installation. It means that the unit connects and disconnects the installation’s electrical loads (non-priority loads) to ensure that the maximum power contracted is not exceeded. Management of the loads is done in accordance with the power rating of the loads, the maximum configured power, and the current energy measured. This system optimises the consumption of energy in the installation because it allows the maximum number of loads to be used simultaneously but does not exceed the contracted power, which would result in high penalties.


  • Local control of 6 electrical loads
  • Remote control expandable with LM4 (12 LM4 x 4= 48 loads)
  • Connection/disconnection of loads according to programmed priority
  • Versatile maximum demand control depending on conditions, using calendars, profiles, etc.
  • Simulation of system performance according to unit programming
  • Allows manual management of loads regardless of programming
  • System compatible with any XML communication master.
  • Archive of over one year with a log of up to 4,500 electrical variables, averaged every 15 minutes, maximum and minimum values over the period (Period can be modified. Ring buffer).
  • RS-485 BUS for connecting up to 12 LM4 i/o.
  • Internet connection systems with dynamic IPs that avoid the need for static IPs in the MDC-20 units.
  • Generate and record your own variables using the data obtained from the units. (EnPi,%,Kg,CO2, Euros, etc.).
  • Programming to send e-mails to distribution lists with personalized messages, including the information of any variable from the metering units.
  • 100…240 V a.c. power supply
  • Compatible with MC transformers (…/250mA)
  • Load operating times
  • Connection with measuring units via Modbus RTU in RS-485 and TCP (Modbus via IP on an Ethernet network)
  • The device can display any calculus or variable of any configured unit.
  • The Ethernet network can be configured through the device’s keyboard (without the need a computer).
  • Time synchronisation via NTP servers (network time provider)
  • 8 digital inputs for logical states, or counting impulse signals (electric energy meters, water meters, gas meters, etc.) or load status feedback (inputs/outputs). Expandable via auxiliary LM range units.
  • 6 relay outputs controllable via alarm configurations, maximum demand time controls. Expandable via auxiliary LM range units.
  • Programming of alarms by any parameter to control the relays of the unit itself or of other auxiliary LM range units.


RS-485 Channel

Type RS-485 (A-B-S)
Protocol Modbus RTU
Speed (bps) Configurable 4800, 9600,19,200, 34,800, 57,600, 115,200
Data bits 8
Parity No parity, even, odd
Stop bits 1 or 2

Environmental Features

Operating temperature -10…+60ºC
Storage temperature -10…+70ºC
Maximum operating altitude 2,000 m
Humidity (without condensation) 5 – 95%

Mechanical Features

Box material UL94–V0 self-extinguishing plastic
Protection degree IP 20
Weight 250 g
Outer dimensions (mm) 105 x 90 x 65 mm (6 modules)


Box / Flammability UL 94
Electrical safety EN61010-1
Electromagnetic compatibility (EMC) EN 61000-6-1, EN 61000-6-2 , EN 61000-6-3, EN 61000-6-4

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