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The power supply terminals are indicated with the abbreviation AL1-AL2 and are
also shown in table TAB 1 at the end of the manual.
ELECTRICAL CONNECTIONS
Perform the connections on the terminal board following the scheme on TAB 1 at
the end of this manual.
FAULT relay usually results excited during normal working of device (FAULT
STATUS A, TAB 1), in case of failure of probes or feeding absence, the relay
switches off (FAULT STATUS B, TAB 1).
FAN relay is dedicated to the management of the fans of cooling of the transformer
or for the conditioning of the environment where the transformer is installed.
The ALARM and PRE AL relays switch on when the temperature is higher than one
degree of set level.
Each probe type PT100 is gifted with three wires, one of them is white and the other
two are red.
Connect the white wire to the terminal board which is marked as shown as sensor,
connectors (1-4-7-10)
The twelve terminal boards relevant to the four probes are divided as follows:
Probe N. 1 connectors 1-2-3, probe N. 2 - connectors 4-5-6
Probe N. 3 connectors 7-8-9, probe N. 4 - connectors 10-11-12
Serial communication interface RS485 half duplex:
• GND: connector 25.
• Transmission/Receive positive: connector 26.
• Transmission/Receive negative: connector 27.
Analogic port 4-20 mA - 0-20 mA (CT-4/20MA):
• Positive: connector 28
• Negative: connector 29.
• Maximum permissible impedance 500 Ohm.
Temperature range (CT-4/20MA):
• Scale 4-20 mA (-10°C 4 mA - 200°C 20 mA)
• Transformation formula: Iout = (T+10)/210*16 + 4 (current in mA, temp. in °C)
• Scale 0-20 mA (-10°C 0 mA - 200°C 20 mA).
• Transformation formula: Iout = (T+10)/210*20 (current in mA, temperature in °C).
All measured signals cables must preferably be:
• Separated from the power cables
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