4
T-154 0-240°C protection relays
TECSYSTEM S.r.l ®
2) MOUNTING
Make a hole with the dimensions of 92x92 mm in the panel plate.
Fasten firmly the unit by the fixing blocks included with each unit.
3) POWER SUPPLY
The T-154 unit has a universal power supply. It can be supplied with 24 to 240 Vac or dc
without respect to polarities.
The ground cable must be fixed to terminal # 41.
ATTENTION: the unit may be damaged by overvoltage when power is supplied directly
from the secondary of the transformer it is monitoring. This may occur when the 220V is
obtained directly from the secondary winding and there are fixed capacitors online.
4) ALARMS AND FAN CONTROL ELECTRICAL CONNECTIONS
Take the removable terminal board off the unit before wiring.
ALARM and TRIP relays energize only when the prefixed temperature limits are reached
(NO Fail Safe) or reset when the prefixed temperature limits are reached (Fail Safe).
The FAULT relay always energizes when the apparatus is powered and it resets when the
Pt100’s are damaged or when there is no power voltage.
The FAN relay can be used for fan control or else it can be included in the conditioning cir-
cuit of the transformer box.
5) THERMOMETRIC SENSORS CONNECTION
Each Pt100 sensor has three conductors : one white and two red (CEI 75.8)
Fig.1 shows the disposition in the terminal board of the connection cables to the unit.
Channel 2 must be always referred to the central column of the transformer.
Channel 4 must be always referred to the core of the transformer or else to the ambient
Pt100 sensor, if you want to monitor the temperature of the transformer box through the
T-154 unit.
In order to protect the electronic apparatus, we suggest the application of the electronic
dischargers of the series PT-73 mono or double phase.
Alternatively, we suggest the application of a 24 Vac or better 24 Vdc power supply.
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