13
FO 935
CFO 521 CONCENTRATOR OPERATION
1)
FO IN Input
5)
Dip-switch (not used)
2)
FO OUT output not used
(Provision for future developments)
6)
CH3 fibre optic input
3)
CH4 2/3-wire Pt100 input
7)
CH2 fibre optic input
4)
L1-L2-L3 LED
8)
CH1 fibre optic input
2
1
3
4
5
6
7
8
The CFO 521 device electronically acquires and converts the temperatures detected by the FO sensors CH1-CH2-CH3 and
CH4 (Pt100) and sends the detected data to the FO 935 monitoring unit via the TEC digital communication bus.
The FO (fibre optic) temperature sensors must be connected to the CH1-CH2-CH3 inputs arranged in the three phases of
the U-V-W transformer. For a correct interpretation of the measured values it is advisable to combine the CH2 probe with
the central phase V.
The CFO 521 concentrator has a Pt100 input, RTD class A 2/3-wire probe, for the possible connection of a probe on the
core of the transformer or application of an ambient probe (CH4).
The connection of the Pt100 probe must be 13- White - 14 Red - 15 Red.
The dip-switch must be 000
The LEDs indicate the operating status of the concentrator and of the connected sensors:
• all LEDs OFF signal the lack of power supply on the CFO 521 device.
• Single or multiple LEDs flashing: L1-L2-L3, single flashing every 2 seconds, indicates the correct functioning of channel
CH1-CH2-CH3.
• Single or multiple flashing LEDs: L1-L2-L3, double flashing every 2 seconds, indicates incorrect operation of the reference
channel of channel CH1-CH2-CH3.
1MN0226 REV.0
