9
T538 protection relays
TECSYSTEM S.r.l ®
17) HOLD FUNCTION
If you set up by programming HLD-YES, ALARM and TRIP relays will be energized until
the manual reset when the temperatur falls down below the set alarm thresholds. If you do
not want this function you have to establish
HLD-NO by !
!!
! and "
""
" push-buttons.
18) PROGRAMMING REHABILITATION IN CASE OF BLOCK (Prg no)
If the programming has been blocked, in order to enter again the programming of the unit,
it is necessary to carry out the following unblocking procedure :
enter the program vision way pushing PRG
keep TEST pushed until PRG stops to lighten. ( LED PROGRAM alight )
During the blocking, pushing PRG for more than two seconds, on the display it appears
“
noP” to indicate the impossibility to program the data.
19) ALARM RELAYS TEST
This function allows to test the relays working without any additional instrument.
To carry out the test you have to push TEST for 5 seconds: all the LED will switch on and
on the display will appear
tSt lightening.
Release it when the RELAY TEST LED will be alight.
The first relay to test will be indicated by the display and the respective LED will be alight.
The relays to test will be indicated on the display by:
“
Fan” : fan relay (if the option is present)
“
Flt” : Pt100 fault relay
“
Alr” : alarm relay
“
TrP” : trip relay
Select the relay to test by
!
!!
! and "
""
" push-buttons. Energize it pushing SET and de-
energize it pushing RESET.
In order to stop this procedure, you have to push again TEST and all the relays will be re-
stored to the starting configuration.
After 5 minutes of inactivity of the keyboard, the TEST RELAY procedure will be automati-
cally interrupted.
20) ALARM RELAY EXCLUSION
If you want to exclude the alarm signal, you have to push RESET: the relay de-energizes
and the respective LED, which was alight, starts to lighten. If the transformer temperatures
is still rising, the ALARM relay will energize again until to have a temperature value of 5°C
less than TRIP threshold. In this moment the user can exclude again the ALARM, but in
this case, it will not appear any other indication as regards ALARM relay.
The exclusion system will be automatically disconnected when the temperature falls down
the ALARM threshold.
18) PROGRAMMING REHABILITATION IN CASE OF BLOCK (Prg no)
20) ALARM RELAY EXCLUSION
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