Dr.Heron

TEMPERATURE - CONTROLLER

• Controls temperature with great accuracy due to unique PID controlling-technique
• Phase-cut control of fans. Can stop fans at low temperature
• Control signal for motors controlling dampers and inlet valves
• Control-signal for central heating and electric heating. Can control 2 heat-sources in sequence.
• Alarm-relay signals high or low temperature, either fixed or relatively to set-temperature
• RS485-interface for communication-network
• Easy setup for back-up during power failure. Works on 12 V DC

Using Unique Controlling-technique

Based on considerable practically experience a unique PID controlling-technique has been evaluated. The controller is able to maintain the desired temperature with least possible fluctuation.

The controller also handles disturbances in an intelligent way.

Analog Output

A 0-10 V DC control signal is available for motors controlling dampers and valves for in- and outlet of air. Operating range - normally 1.5-9.5 V - can be adjusted.

Built-in Fan-Speed-Control

A built-in phasecut-device controls the speed of the fans. The fanmotor can be shut off automatic when not required.

Heating

The supply of heat can be on/off controlled (heat fan). A 0-10 V control signal is available for motorshuntvalve or other variable heat source supply.
It is possible to setup the two heat outputs so that they will work in a sequence, i.e. when the 1st heat source is inadequate the next starts to supply, both working from 0-100 % supply.

Alarm Function

The alarm-relay has potential-free switches for both on and off in case of alarm.
The alarm can be activated by too high and too low temperature.
High and low temperature limit can be setup to be either fixed or relatively to set-temperature.

Back-up by Power Failure

The controller can be powered by 12 V DC and consequently it can continue monitoring temperature and control dampers and valves.

Communication

RS 485-interface opens up for many possibilities.

• Interface with PC could provide you with a nice survey of a number of units. General operation can also be carried out.
• By means of an optional Speech Processor inquiries and operation can be done through telephone.

Heron (abt. 100 BC)

Heron was one of the great scientist during the Greek Golden Age. His numerous descriptions of hydraulic constructions, mostly bases on the siphon-principle, have survived till time. This includes the description of a system for automatic opening and closing doors controlled be temperature. This is the oldest known description of a mechanical air-conditioning system.