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The task of the Maximum Monitor is to restrict peak power with a quarter-hour measurement of the utility. The Maximum Monitor has priority-switching outputs that can control the electrical loads. By measuring the instantaneous power of energy it can control the power of the measurement period by selective dismantling or switching of the load to a predetermined power set point control. Loads which should be connected to the Maximum Monitor, for example, are Ventilation systems, boilers,compressors and thermoelectric devices, but not safety-relevant consumer loads such as the lighting.

To determine the expected trend, the calculation algorithm is used, the precise description is in chapter trend calculation algorithm of the Maximum Monitor.

 

Power set-points

Four adjustable power setpoints are available, to which the maximum controller regulates the power consumption in the measurement period. Max 1 is provided as the standard tariff, Max 2 as the low tariff, Max 3 and Max 4 as the special tariff.

 

Synchronization of measuring periods

For the correct function of the Maximum Monitor is the parallel operation of the measuring period,utility and Maximum monitor necessary. The synchronous operation is achieved by a synchronous

pulse measurement periods. This is usually available on the respective utilities. If there is no sync pulse the Maximum Monitor has the possibility of generating the internal measuring period time

itself.

 

Maximum Warning

To warn of an impending power overshoot, it is possible to establish a Maximum Warning. If the power trend (result of the trend calculation algorithm) or the cumulative power in a programmed

percentage of the power setpoint has been reached, this is indicated through a contact of the Maximum Monitor. This can, for example, be used to start a generator.

 

Emergency operation

In emergency operation, the outputs are dropped, where the emergency mode is activated. Each Output can be included in the emergency operation. A threat of a set-point overshoot is prevented by

shutting down the outputs in the emergency operation located in the consuming devices.

 

Faults

In a breakdown of operation the Maximum Monitor goes into emergency operation. A malfunction may be triggered, by lack of the sync pulse or failure of the calculated largest working pulse of the

instantaneous power, working value or Instantaneous power value.

 

Message store

Status messages are displayed on the operating status of a message output and additionally stored in a log file of the maximum monitor.

 

Switching outputs

The number of outputs of the maximum monitor can be adjusted as desired. To optimise switching operations, system-specific values can be assigned to each output.

 

Low tariff switching

The Maximum Controller offers the possibility to switch between different tariffs of the electricity supply company. These can be low, high and special tariffs. Switching can be done either directly via a contact of the EVU (data point input Max 2 setpoint switching) or via a defined daily period. When switching tariffs, it is possible to switch between different adjustable power setpoints (Max 1 setpoint and Max 2 setpoint). For special tariffs, "Max 3 setpoint" and "Max 4 setpoint" can be used.