TECSYSTEM T154 Montage Und Programmierung Seite 20

TECSYSTEM S.r.l ®
Notes on FCD function
T154 device series have an innovatory control function combined with the Pt100 probes dynamic state.
If a thermometric probe should by chance break down, the defect is highlighted with a fast increase of its own
resistance and therefore of the temperature recorded by the monitoring device.
It's obvious that this increase is not directly resulting from the power increase of the machine to be protected,
whether it is a motor or a dry or encapsulated transformer.
Therefore it is necessary to know the state of the probe and send a Fault signal instead of an Alarm signal or,
worse still, a Trip signal.
In case of temperature control on electrical motors, the fast rise in temperature could be caused by the working
with a stalled rotor and not by a defective probe; in this case Fault relay, once energised, makes clear this anoma-
lous condition for motor working.
Activating FCD function it is possible to have, on contacts 7-8-9, a Fault signal when temperature recorded by a
Pt100 rises with a speed higher than "n" °C/sec (loadable from 1 to 30).
According to the loaded value, you can have a different sensitivity which can be useful for different applications:
from 1 to 10: high sensitivity, for instance useful to immediately detect stalled of a motor rotor.
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From 10 to 20: average sensitivity, useful to get information relevant to possible noises which affect probe
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reading, connection problems or defective probes.
From 20 to 30: low sensitivity, useful for applications where a higher sensitivity could cause a fault for un-
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wanted FCD's.
- With "no" FCD function is disabled.
When a channel is in Fault for FCD, relevant Alarm and Trip signalling are inhibited in order to report just the
anomaly for the too fast rise in temperature.
Press Reset to cancel FCD signalling for all the channels and to reset relays fault.
PROGRAMMED DATA DIAGNOSTIC
In case of breaking of the internal storage or corruption of programmed data, just after
switching on it appears Ech indication with the relevant reporting of the Fault contact.
In this case, for safety reasons, the default parameters: Alarm Ch1-2-3= 90°C, Trip Ch1-2-3=
119°C, Ch4= Yes, Alarm Ch4= 120°C, Trip Ch4= 140°C, Ch-Fan= 1-2-3, Fan-on= 70°, Fan-
off= 60°, HFn= 000 are automatically reloaded.
Eliminate Ech indication by pressing RESET and run programming to insert desired values.
Finally turn off and turn on again the unit to verify the correct memory working; in case it is
damaged and Ech still appears, please return the monitoring unit to TECSYSTEM for repair.
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T154 TEST DESCRIPTION
PC board test
Input test
Test of relay contacts and outputs
Key test
Lamp test
Calibration at 0 and 200°C
Software test
Burn-in minimum 24h
T154 protection relays