TECSYSTEM T538 - Important Notice

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T538 protection relays

TECSYSTEM S.r.l ®

12) OVER TEMPERATURE ( AUTO and MAN WORKING )

When one or more Pt100 sensors survey higher temperatures than the prefixed ones

switch on:

the GREEN led/s referred to the channel/s

the led referred to ALARM is YELLOW

the led referred to TRIP is RED and the ALARM-TRIP relays commute

When the temperature is 1°C under the prefixed limit, the led switches off and the relay re-

sets.

The over temperature alarm signal is intentionally delayed in order to avoid false alarms

caused by temperature transistors.

The max. temperatures are any way memorized even if their performance time is not

enough long to cause any alarm.

IMPORTANT NOTICE

Before making the insulation test on the electrical panel on which the unit is installed, you

must take it off from the power supply in order to keep it out of damage.

13) FAULT

The T538 monitoring unit is provided with a self-diagnostic program with alarm relay and

visualization of the kind of fault of the sensors.

An additional program allows to distinguish a high temperature signal given by an eventual

defective sensor. In this case the FAULT relays commutes and on the display appears Fcd

with the relative defective sensor.

This particular program avoids the signalization of accidental alarms due to defective sen-

sors which indicate wrong temperature values.

14) DATA STORED DIAGNOSTIC

If the internal memory is corrupted, at the start up on display it appears the message Ech

with the FAULT alarm. In this case the unit uploads the default parameters; press RESET

to delete the FAULT alarm and the

Ech message; start a new programming cycle with the

desired parameters.Turn off and turn on the unit to check if memory work properly. If it is

damaged or broken, on display it appears

Ech message again. In this case, send the unit

to Tecsystem for reparation.

15) THERMOMETRIC SENSORS DIAGNOSTIC

In the event one of the thermometric sensors installed on the machine to protect is dam-

aged, the

FAULT relay energizes immediately, the ALARM and TRIP LED’s of the dam-

aged channel (Ch

n) lighten and the FAULT LED is lightening.

The screen will automatically display a message showing the fault condition:

· Fcc sensor is short circuited

· Foc sensor is open

· Fcd sensor is fault