TECSYSTEM T154-4 Instalación Y Programación página 24

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:
CH1 Alarm= 90°C, Trip= 119°C
CH4= NO, 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.
REMARK
: when the control device is directly fed from secondary winding of the transformer to be pro-
tected, it can be damaged by high-intensity overvoltages: these problems occur if the main switch is con-
nected without load. Above mentioned problems are much more evident when the voltage is 220 Vac is
directly taken from the transformer secondary bars and there is a fixed capacitor battery to phase the
transformer itself.
To protect the control device from line overvoltages, we suggest to use the electronic discharger PT73-
220, designed by TECSYSTEM S.r.l. for this specific purpose.
As alternative we suggest to use supply voltages from 24 Vac or, much better, 24 Vdc.
In case of unit replacement, to grant the correct and safe operating, you must replace the sensors,
relays, and power supply connecting terminals with the new terminals provided with the unit: this
only if the terminal blocks are of different brand.
RULES FOR WARRANTY
The Product purchased is covered by manufacturer's warranty or the seller's terms and conditions set
forth in the "General Conditions of Sale Tecsystem srl", available at www.tecsystem.it and / or pur-
chase agreement.
The warranty is considered valid only when the product will be damaged by causes attributable to
TECSYSTEM srl, such as manufacturing or components defects.
The warranty is invalid if the Product proves tampered / modified, incorrectly connected, because
voltages outside the limits, non-compliance with the technical data for use and assembly, as described
in this instruction manual.
Any action about warranty is always at our factory in Corsico-MI, Italy as stated by the " General Con-
ditions of Sale Tecsystem srl ".
RAEE: This SYMBOL, shown on the unit, indicates that the waste must be subject to
"separate collection". The end-user must send the unit to the "waste collection centers", or
return the unit to the dealer against the purchase of a new equivalent device.
24
CH2 Alarm= 90°C, Trip= 119°C
T154-4
CH3 Alarm= 90°C, Trip= 119°C