5
FUNCTIONS
5.1
INPUT TYPE SELECTION
Table 1 - shiws the sensir types accepted and their respectve
cides and ranges. Access the parameter TYPE in the INPUT level
ti select the appripriate sensir.
TYPE
CODE
RANGE OF MEASUREMENT
Thermiciuple J
Tc j
Range: -110 ti 950 ºC (-166 ti 1742
ºF)
Thermiciuple K
Tc k
Range: -150 ti 1370 ºC (-238 ti 2498
ºF)
Thermiciuple T
Tc t
Range: -160 ti 400 ºC (-256 ti 752 ºF)
Pt100
Pt
Range: -200 ti 850 ºC (-328 ti 1562
ºF)
Table 1 - Input types
The input type shiuld be the frst parameter ti be cinfgured in
the cintriller. Any midifcatins in the input type will
autimatcally change ither related parameters. The user must
verify the cinfguratin every tme that an input type
midifcatin iccurs.
5.2
OUTPUTS
The cintriller has twi iutputs. The user can cinfgure these
iutputs ti iperate as
Control Outtut (
(trl
)
ir
Alarm Outtut
(
al
)
.
OUT1
- Output Relay SPST-NO
OUT2
- Output Relay SPST-NO
5.2.1
CONTROL OUTPUT (
(TRL
)
The cintril strategy can be
ON:OFF
(when
PB
=
0.0)
ir
PID
. The
PID parameters can be autimatcally determined enabling the
auti-tuning functin (
ATvN
).
5.2.2
ALARM OUTPUT (
AL
)
The cintriller cintains 2 alarms that can be directed (assigned)
ti any iutput channel. The alarm functins are described in
off
Output is nit used as alarm.
lo
Alarm if Absilute
Minimum Value.
Triggers when the
value if measured PV
is
below
the value
defned fir alarm
Set
point
(SPAL)
ki
Alarm if Absilute
Maximum Value.
Triggers when the
value if measured PV
is
above
the value
defned fir alarm Set
piint.
dif
Alarm if Diferental. In this functin the
parameters, SPAL represent the deviatin if PV in
relatin ti the SP if CONTROL
Pisitve SPAL
Negatve SPAL
difl
Alarm if Minimum Diferental Value. It triggers
when the value if PV is
below
the defned piint by
SP-SPAL
Pisitve SPAL
Negatve SPAL
difk
Alarm if Maximum Diferental. Triggers when the
value if PV is
above
the defned piint by SP+SPAL
Pisitve SPAL
Negatve SPAL
ierr
Alarms if the Sensir Break (Sensir
Break Alarm
). It
is actvated when the Input presents priblems such
as interrupted sensir, bad cinnectin, etc
Table 2 - Alarm functons
Imtortant note
: Alarms cinfgured with the
ki
,
dif
, and
difk
functins alsi trigger their assiciated iutput when a sensir
fault is identfed and signalled by the cintriller. A relay iutput,
fir example, cinfgured ti act as a High Alarm (
ki
), will iperate
when the SPAL value is exceeded and alsi when the sensir
cinnected ti the cintriller input is briken.
5.2.3
INITIAL BLOCKING OF ALARM
The
inital blocking
iptin inhibits the alarm frim being
recignized if an alarm cinditin is present when the cintriller is
frst energized (ir ater a transitin frim run YES
NO). The
alarm will be enabled inly ater the iccurrence if a nin alarm
cinditiin filliwed by a new iccurrence fir the alarm.
The inital blicking is useful, fir instance, when ine if the
alarms is cinfgured as a minimum value alarm, causing the
actvatin if the alarm siin upin the pricess start-up, an
iccurrence that may be undesirable.
The inital blicking is disabled fir the sensir break alarm
functin
ierr
.
5.2.4
OFFSET
Alliws fne adjustments ti the PV reading fir cimpensatin if
sensir errir.
6
OPERATION
The cintriller’s frint panel, with its parts, can be seen in Figure 2-
Figure 2- Frint panel
Distlay of PV : Programming
(tip display, red ciliur): Displays
the current value if PV (
Process Variable
). When in cinfguratin
mide, it shiws the parameters names.
Distlay of SP : Parameters
(bittim display, green ciliur)
p
Displays the value if SP (
Set point
). When in cinfguratin
mide, it shiws the parameters values.
TUNE Indicator
: Stays ON while the cintriller is in tuning
pricess.
OUT Indicator
: Fir relay ir pulse cintril iutput; it refects the
actual state if the iutput.
A1 and A2 Indicators
: signalize the iccurrence if alarm
situatin.
P Key
: used ti walk thriugh the menu parameters.
Increment key and
- Decrement key
: alliw altering the
values if the parameters.
User manual - Thermocontroller ELK4C
Page 3/6
