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Controller Catalogue_2015 04/08/2015 13:43 Page 28
Refrigeration Head Pressure Controller
The Head Pressure Controller (HPC) varies the speed of EC fans to control the head
pressure of a refrigeration circuit. The pressure sensor input and speed control output to
the EC fans are 0-10VDC, control of 24 fans maximum.
The set point may be set locally by means of a trim device on the control PCB.
An optional PC interface allows set-point configuration and data logging from a PC.
The controller allows the refrigeration system to be operated with a Floating Head Pressure,
which can provide substantial energy saving and reduced compressor workload leading to
IP Rating
Part Number
Ambient Temperature
Supply Voltage
increased service life.
• 0-10V Pressure Sensor input
• Pressure Set-point set by on board Potentiometer or from PC interface
• Microcontroller uses PID program with configurable P, I and D gains for optimum combination of response speed and stability
• Two 0-10V Fan Speed Control outputs (Open Collector output option by DIP switch setting).
• Control of 1-24 EC Fans per controller, maximum 12 EC Fans per 0-10V output.
• Fan speed offset option for the two 0-10V outputs provides Ultra Low Volume control for maximum energy saving at low ambient temperatures.
• The controller also optionally monitors Condenser and Ambient Temperatures (using two thermistors) to provide optimised energy use at high
ambient temperatures.
• For small systems (1-2 fan systems 230VAC, 13A maximum fan load) the fans may be powered via controller PCB. This avoids the need for
any additional connector blocks, wiring and associated enclosure.
• For Tachometer Output fans on small systems, 1-2 fans, the controller can monitor Fan Tachometer signals. For other systems, 1-24 Fans, the
controller can monitor Relay Alarm type fans.
• Controller relay alarm output, contacts rated 60VDC, 100mA, Fan or Thermistor Alarm.
• Optional PC Interface for Configuration and Data Logging.
• Parameters may be set from PC interface, overriding PCB controls.
Settings stored on PCB in non-volatile memory.
• 24VDC output for Pressure Sensor supply.