FAQ - RTE

FREQUENTLY ASKED QUESTIONS

In what context are ISA sequence alarm announcers used?

Alarm announcers are mainly used to signal by means of analog contacts NA (Normally open ) or NC ( Normally closed ) any alarms coming from the field.

How to choose the right ISA SEQUENCE announcer?

ISA sequence alarm announcers are used in many sectors, (Industrial, Petrochemical, Naval, Railway, Metropolitan, Electrical panel construction, etc. ) .Therefore, in order to choose the right alarm control unit, you must first know the field of application.

There are multiple alarm announcers that differ substantially by type, which can be INTEGRATED LOGIC or SEPARATE LOGIC and alarm sequence, which can be ISA-01/ISA-2C / ISA-4A /ISA-2A /ISA-1A / ISA2C +FIRST OUT.

In addition, there is the possibility of customizing an alarm sequence according to the needs of the customer.

Is there a correspondence between ISA sequences and S.18 sequences?

These are 2 different methodologies for identifying the same alarm sequence.

ISA-01 = S18.1A
ISA-2C = S18.1M
ISA-4A = S18.1F1A
ISA-2A = S18.1R-8
ISA-2C + FIRST OUT = S18.1F2M + FIRST OUT

Whatis the difference between integrated logic and separate logic?

The difference between an alarm announcer with integrated logic and an alarm announcer with separate logic is the following:

INTEGRATED LOGIC. The logic that processes the alarm sequence and the alarm display system are both on board the alarm announcer and are, for example , mounted on the front door of an electrical panel.
SEPARATE LOGIC: The logic that processes the alarm sequence is on board the alarm announcer, which is positioned, for example , inside an electrical panel while the alarm display system is on the front door of the same electrical panel.

What is the purpose of the remote control contact?

The remote control contact is used to repeat the alarm signal remotely. For example, it can be used if you want to report one or all the alarms inside a place manned by operators .

What to do if an alarm announcer does not turn on

Verify that the power supply voltage is present and also make sure that it is correct and complies with the data on the plate shown on the alarm announcer.
If there are circuit breakers, make sure they are correctly positioned in the CLOSED position.
In the presence of fuses mounted on the alarm announcers, check their integrity.
Check that the connections to the alarm control unit are correct and comply with the wiring diagram that is provided together with the alarm announcer.

If at the end of the above checks, the alarm form still does not turn on, contact our technical assistance at the telephone number 0373/920659 or at the email address tecnico@rtecomponenti.it

In the presence of a display of numerous alarms, issued in rapid succession, is it possible to identify which alarm was the 1st to come out with respect to all the others?

If you need to distinguish the 1st alarm that came out with respect to all the others that came in rapid succession and especially if they are a consequence of the anomaly caused by the 1st alarm, the alarm sequence to use is ISA-2C WITH FIRST OUT.

Under what circumstances is the ISA-2C alarm sequence used WITH FIRST OUT.

The ISA-2C WITH FIRST OUT alarm sequence is used when it is necessary to distinguish which of the numerous alarms was the first to come out. This alarm sequence allows for the 1st alarm with flashing light to be displayed, whereas for all the others, the output after the 1st display will be a fixed light, thus ensuring the operator quickly identifies the 1st alarm displayed.

Example : If a transformer were to lose the cooling oil, the 1st alarm to be displayed, with flashing light, would be “TRAFO 1 OIL LEAK”. In rapid succession, other alarms would be displayed, (HIGH TEMPERATURE TRAFO 1 – FIRE RISK TRAFO 1 – Etc.) which, however, since they are anomalies resulting from the 1st cause of the alarm, that is, the oil leak, would be displayed with a fixed light.

Is it possible to change the programming of the alarm contact of an alarm annunciator, from NA to NC or vice versa, after the control unit has already been installed on an electrical panel?

Some of our alarm annunciators provide for this, as they are equipped, for each alarm point, with a deep-switch which enables, via commutation, to reprogram a contact from NA to NC or vice versa from NC to NA. See the technical data sheet alarm annunciator – Our SAMI or MA6 series.

Is it possible to keep alarms displayed, even if they have already been recognized by the acquisition button and the cause of the failure has been removed?

This functional type is managed through the use of the following alarm sequences: ISA-2A – ISA-2B – ISA-2C – ISA2C WITH FIRST OUT – ISA-2D. The alarm annunciators that manage these alarm sequences, in addition to being equipped with the 2 buttons AQ = ACQUISITION and PS = SEQUENCE TEST, provide for the use of a 3rd button, called SL = RESET, whose function is to ensure that the alarm display is not switched off automatically when the cause of the fault disappears, but only after the manual intervention of an operator, through the use of the SL = RESET button.