Maximum demand control devices

Description

The MDC-20 is a unit designed to predictive 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.

The unit is equipped with relay outputs that enable the management of up to 6* electric loads without expanding.
*(It is possible to use the output for some alarms conditions. In this case, the number of free relays to control local loads is 4).

• Peripheral communications fault alarm
• Insufficient loads for the power control
• It is possible to expand the number of controlled loads by the MDC-20 with up to 12 LM4I/4O operated by RS-485 communications.

Its main features are:

• 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.
• Instantaneous energy value reading through Modbus/RTU
  communications or the impulse input.
• Synchronising impulse input.
• Ethernet connection to centralize it in other applications or communicating with remote peripherals on the ethernet network.
• Feedback load status control through the logic status of the inputs
• Centralising consumptions by impulses.
• Disabling load management according to schedule.
• Simulation tool for verifying system behaviour.

AC power supply

Digital relay outputs

Digital inputs

Serial communication

Mechanical characteristics