Capacity controller EKC 531D1
Application
The controller is used for capacity regulation of compressors or condensers in small refrigerating systems.
Introduction
Application
The controller is used for capacity regulation of compressors or condensers in small refrigerating systems.
Numbers of compressors and condensers can be connected, as required.
There are eight outputs and more can be added via an external relay module.
Advantages
* Patented neutral zone regulation
* Many possible combinations for compressor constellations
* Sequential or cyclic operation
* Possibility of suction pressure optimisation via the data commu-nication
Regulation
Regulation is based on signals from one pressure transmitter for the compressor regulation and one pressure transmitter for the condenser regulation plus one temperature sensor for the air temperature before the condenser.
The two pressure transmitters can be replaced by two temperature sensors when regulation has to be carried out on brine systems.
* Pressure regulation P0 (pack)
* Temperature regulation Sx (chiller)
* Pressure regulation Pc (pack/ chiller)
* Pressure regulation with variable reference (Sc3)
Functions
* Relays for compressor and condenser regulation
* Voltage output for capacity regulation of condenser
* Status inputs. An interrupted signal indicates that the safety circuit has been activated and the
respective circuit stopped
* Contact inputs for indication of alarms
* Contact inputs for displacement of references or for indication of alarms
* Alarm relay
* External start/stop of regulation
* Possibility of data communication
Operation
All operation takes place either via data communication or via connection of a display type EKA 164 or EKA 165.
Combinations
The controller has ten relay outputs two of which have been reserved for the alarm function and for the ”AKD start/stop” function.
For a start relays are reserved for compressor capacities starting from DO1, DO2, etc.
The remaining relays up to and including DO8 will then be available for fans. If more are required, one or more relay modules type EKC 331 with max. eight steps can be connected. The signals to these modules are to be taken from the controller’s analog output. Another solution could be that the fan speed is controlled via the analog output and a frequency converter.
If the alarm function and the ”AKD start/stop”function are left out, all ten relay outputs may be used for compressors and fans (but max. eight for compressors and max. eight fans).
