TECSYSTEM T538 - Power Supply

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T538 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 you are equipped with.

3) POWER SUPPLY

The T538 unit has an Universal Power Supply: it can be supplied indifferently from 24 to

240 Vac-dc without any respect of the polarities.

This particularity is obtained by the application of a tried power supplier which provides the

installer free from the worries concerning the correct Vac or Vdc power supply.

The ground cable must be fixed to the clamp 41.

When the unit is supplied directly from the secondary of the transformers to protect, it can

be fulminated by high intensity overvoltage.

This happens when the charge is connected with the locking of the master switch.

This is much more evident when the 220 Vac voltage is obtained directly from the bars of

the secondary of the transformers and there is a fixed phase adjustment condenser of the

same transformer.

In order to protect the electronic apparatus, we suggest the application of the elec-

tronic discharges of the serie PT73 –220 which have been studied by Tecsystem Srl

for this specific purpose.

Alternately, we suggest the application of a power supply by 24 Vac or better 24 Vdc.

4) ALARMS ELECTRICAL CONNECTIONS

Carry out the electrical connections on the removable terminal board after having taken

them off from the apparatus (follow the Fig.1).

ALARM and TRIP relays energize only when the prefixed temperature limits are reached

(NO Fail Safe) or deenergize when the prefixed temperature limits are reached (Fail Safe).