Inhibition at power-up:
Alarm blocking at power-up inhibits the relay alarm from
activating when the unit is first energized. The alarm will only trip after the process
variable reaches a new alarm situation.
5.4 CYCLE 4 – CALIBRATION LEVEL:
NOTE: All input and output types are factory calibrated. This cycle
should only be accessed by experienced personnel. If in doubt do
not press the
or
keys in this cycle.
Alarm Hysteresis:
Defines the differential range between the PV value at which
the alarm is turned on and the value at which it is turned off.
Inl(
Input Low
Calibration
SENSOR OFFSET CALIBRATION. Sets the temperature sensor
low calibration (offset). The display shows only the corrected
temperature and not the offset added. A signal simulator should be
used to inject a low value signal to properly adjust the offset.
InK(
Input High
Calibration
INPUT HIGH CALIBRATION. Sets the sensor input circuit gain or
high calibration. A signal simulator should be used to inject a high
value signal to properly adjust the offset.
(j L
C
old
J
unction
L
ow
C
alibration
COLD JUNCTION OFFSET CALIBRATION: Sets the cold junction
°C offset calibration. A good thermometer or a temperature simulator
should be used to properly adjust this parameter.
Alarm Functions (Graphic):
SV
SV
+
(
SPAL
-
)
AL
on
AL
on
time
Process
SV
SV
+
(
SPAL
+)
AL
on
AL
on
time
Process
Dif-Low SPAL - (a) Dif-Low SPAL+
PID AUTO-TUNE OPERATION:
During auto tune the temperature is controlled in ON/OFF mode until is reaches
the programmed Set Point (SV). Depending on process characteristics large
oscillations above and below SV may occur and auto tuning may take several
minutes to be concluded.
SV
SV
+
(
SPAL
+
)
AL
on
time
Process
SV
SV
+
(
SPAL
-
)
AL
on
time
Process
The standard procedure is as follows:
• Disable all outputs at the
rvn
prompt in the Operation Cycle (Cycle-1) by
selecting 0
.
• Disable the
rate
and
t sp
in Cycle-1 by selecting
0
for each.
• Enable auto-tuning at the
atun
prompt in the Tuning Cycle (Cycle-2) by
selecting 1
.
Dif-High SPAL+ (b) Dif-High SPAL-
• Enable all outputs at the
rvn
prompt in Cycle-1 by selecting
1
.
SV
SV
+
(
SPAL
+
)
AL
on
time
SV
+
(
SPAL
+
)
AL
on
Process
SV
SV
+
(
SPAL
-
)
AL
on
time
SV
+
(
SPAL
-
)
Process
17
During auto-tune the AT LED is ON. Once auto-tune is complete, the AT LED
turns OFF.
The recommended procedure is as follows:
• Follow the procedure above except, program a setpoint 10 – 15% below the
final desired value.
• After auto-tune is complete (the “AT” LED is off), change the setpoint to the
final desired value.
If auto-tuning results are not satisfactory, refer to section 6.5 and Table 2 for
manual fine tuning procedure.
Dif SPAL+ (c) Dif SPAL-
NOTE: Certain processes behave in very irregular manners. In these cases,
(Figure 9)
control type “On/Off with hysteresis adjust” is recommended.
16
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