Functions; Serial Option - Carel FCM series Manual

5

Functions

The output of the FCM* controller provides a continuous voltage signal ranging between 0 V and 10 V; the exact value depends on the
measurement made by the connected probes, according to the selected operating mode and the programmed control parameters.
Alternatively, the control output can be used to carry out On/Off regulation. The voltage signal is connected to an actuating device which
regulates the system; as a consequence it keeps the controlled value within the set limits.
The types of probes which can be used depend on the model of control:
•
NTC-type probes automatically range of measurement and connections are identified.
÷
•
NTC probes and 4 20mA current probes
•
probes with voltage or current output
as well as the minimum and maximum measurable values.
In the specific case of condensation temperature control based on the use of pressure probes, it is possible to convert automatically
the measurements into temperature, thus simplifying the condenser operating mode. To make automatic conversion possible, it is
necessary to select the exact type of refrigerant to be used.
Note: If the refrigerant used is not R22, R404A, R407, R134A, R410A, R290 or NH 3 (ammonia), conversion will not be possible
and all values will be expressed in bar.
5.1

Serial option

To make connection possible, a serial interface board for 2-lead RS-485 standard serial communication must be inserted inside the
control.
This board (code FCSER00000) can be used both for connection to supervisory network and for pLAN network.
The parameters concerning serial connection (P52,...,P56) must be set according to the type of connection selected.
The board may also be ordered and installed at a later time.
To insert the board inside the control:
1. disconnect power supply;
2. lift the front panel by levering it with a suitably-sized screwdriver;
3. insert the board into the relative connector inside the control, making sure that the polarity key corresponds to the guide slot beside
the connector;
4. replace the front panel to its original position.
FCSER0000 card mounting
FCM electronic regulator
Ü
disconnection is automatically identified and the relative alarm generated.
Ü
the type of value measured must be selected, that is (temperature/humidity or pressure),
Fig.2
5
Cod. +302235300 - Rel. 2.0 del 30/11/98