ALARM SET POINT
SET POINT VALUE
SV
RAMP RATE
OFFSET
DISPLAY SHIFT
PROPORTIONAL BAND
INTEGRAL
DERIVATIVE
LOCK OUT
SELECT
CONTROL
NO.
PARAMETER
E
T
A
D
CYCLE TIME
INPUT TYPE
ALARM TYPE
ALARM HYSTERESIS
RESOLUTION
DEGREES C OR F
CONTROL ACTION
ERROR PROTECTION
CONTROL HYSTERESIS
LOW RANGE
HIGH RANGE
Table 5.4 Parameter Chart
Long Scroll
PARAMETER DEFINITIONS:
PV - Process Value - This is the temperature (or other
process variable) as measured at the sensor. This will indi-
cate a value within the range between the low scale value
(LLiE) and High scale value (HLiE). This indication will read
an error code if the temperature (process variable) goes out
of the preset span. Note items 4 and 5 of the troubleshoot-
ing guide on page 21 for the error code descriptions.
SV - Set Point Value - This parameter is the desired set
point of the process. It can be adjusted within the range
defined by the low scale (LLiE) and high scale value (HLiE).
The span adjustments can be used to limit the set point set-
ting of the controller.
ASP1 - Alarm Set Point Value or Dwell Time - This sets
the point at which the alarm will energize if ALAI (alarm
mode selection) is set for an alarm function. If ALAI is
selected for the dwell timer function (setting 11 or 12), then
this becomes the timer setting in minutes. The dwell timer
starts counting when the process value reaches the set
point value. Note page 17 for more information.
rr - Ramp Rate - This controls the heat-up and cool-down
rate of the process. This setting is in degrees per minute.
Note page 15 for more information.
oFST - Offset Value - This parameter is only functional if
the integral time (Ti) is set to zero. The oFST than func-
tions the same as manual reset to correct the process tem-
perature to the set point temperature. If the process tem-
perature stabilizes below the set point, set a positive
amount of oFST. If the process temperature stabilizes
above the set point, set a negative amount of oFST. Wait
for the system to stabilize and make further adjustments as
required. The number observed in this parameter can be
ignored if you have a number greater than 1 entered in the
integral setting (Ti).
ShiF - Display Shift - A value entered here will be added to
or subtracted from the Process Value. This offset can be
used as a correction factor if the sensor does not read the
same temperature as the item being sensed. It can also be
used to correct for calibration. Note page 18 for more infor-
mation.
Pb, Ti and Td - PID Values - Proportional band (Pb),
Integral (Ti) and Derivative (Td) time constants. These
must be set as close as possible to the process application
requirements. During auto-tuning, these parameters will be
adjusted. Note pages 13, 14 and 15 for more information.
LoCL - Local Mode - Used to disable the up and down but-
tons to prevent tampering.
SEL - Select - Used to upgrade commonly used parame-
ters to Level 1.
CT - Proportional Cycle Time - This sets the proportional
cycle time for the control output. This should be set accord-
ing to the type of output device used. For mechanical
relays, cycle times of 15 to 20 seconds are used. For solid-
state relays, set this adjustment to 1 or 0. For 4-20mA or
other linear outputs, adjust to 0.
in - Input Mode Selection - This parameter is used to pro-
gram the control to the type of input sensor used.
ALAI - Alarm Mode Selection - This adjustment sets the
type of alarm (or dwell timer) to be used: deviation alarm,
band alarm or process alarm. Refer to page 16 for more
information.
(Continued on next page.)
