Instruction manual

2726
P a r a m e t e r
D e s c r i p t i o n s
Menu “02”
Display Parameter Allowable Values
Gn.o1 Gain Output 1 00 to 400
(PID heat gain)
Gr.o2 Gain Ratio Output 2 0.0 to 2.0
(PID cool gain ratio)
H.HYS Heat Hysteresis 01 to 100°
C.HYS Cool Hysteresis 01 to 100°
HYS1 Output 1 Hysteresis 1 to 100 units
HYS2 Output 2 Hysteresis 1 to 100 units
SPr.2 Spread Adjustment, Output 2 0 to 100 units
C.SPr Cool Spread 0 to 100°
rAtE PID rate 00 to 900 seconds
rSEt PID reset 00 to 3600 seconds
dPnG Damping (see notes) Lo, nL, Hi, Off
Setting Rate (Derivative)
or Reset (Integral) to
[ 00 ] disables that
aspect of PID control.
The ratio of rate-to-reset
is limited to a minimum
of 1:4, i.e., Reset value
cannot be set any lower
than four times Rate.
The parameters of Heat
Hysteresis, Cool Hys-
teresis and Cool Spread
are only available when
Output 1 and/or Output
2 are set to on/off mode
[Ht.O] or [CL.O]. They
replace Gain Output 1
and
Gain Ratio Output 2,
respectively.
Notes on Damping: The damping parameter is an autotune feature that
enables more precise control of setpoint overshoot during recovery from
process upsets in which thermal or transfer lag is a factor. See Figure 12.
Use the correct setting prior to autotuning to compensate for power and
load/sensor coupling characteristics.
Lo = Fast recovery with slight overshoot. For single-lag processes.
Ex. Adequate power and excellent load/sensor coupling.
nL = Normal recovery with no overshoot. For two-lag processes.
Ex. Properly sized heaters or components and good load/sensor
coupling.
Hi = Slow recovery with no overshoot. For three-lag processes.
Ex. Overpowered with multiple lags. Poor load/sensor
coupling.
OFF = Autotune disabled; manual output control enabled.
(This value may
exceed 400 as
a result of auto-
tuning.)
P a r a m e t e r
D e s c r i p t i o n s
Menu “03”
Display Parameter Allowable Values
ALr1 Alarm 1 setting Dependent on sensor range
ALr2 Alarm 2 setting Dependent on sensor range
(if ordered)
CY.t1 Cycle time output 1 00 to 120 seconds
CY.t2 Cycle time output 2 00 to 120 seconds
SP.tt Setpoint target time Off/1 to 100 minutes
(ramp-to-setpoint)
L.SP.L Lower setpoint limit Dependent on sensor range
U.SP.L Upper setpoint limit Dependent on sensor range
L.SCL Low scale setting -1999 to 9999
H.SCL High scale setting -1999 to 9999
Output Type Recommended Setting (seconds)
B (5A/3A) 15 to 120
E (0-20 mA) 00
F (4-20 mA) “00”
S (pulsed 20 Vdc) 00 to 120
T (S.S. relay) 15 to 120*
Setting output cycle
time to “00” initiates
a 200 ms timebase. A
cycle time setting is
required for smooth
proportional action.
Too long a setting may
cause proportional
ripple; too short may
decrease relay contac-
tor life.
When changing
thermocouple types,
be sure to check/adjust
upper and lower set-
point limit values.
Notes on Setpoint Target Time: The [ SP.tt ] parameter allows the operator to enter a time delay for the
process to reach setpoint temperature (ramp to setpoint), from disabled [ OFF ] or 1 to 100 minutes. When
enabled, the ramp sequence starts on power-up. The ramp-to-setpoint feature will also be initiated whenever
a new setpoint target time is entered AND the Setpoint Value is 5° F or more from the current process tem-
perature. In operation, the controller’s lower window display will flash or to indicate that it is
“ramping” up or down to setpoint. The Setpoint Value cannot be
changed during this procedure. After it is finished, the operator can adjust the setpoint temperature to the
desired value.
While in ramp startup, the ramp-to-setpoint mode can be aborted and the controller returned to regular
operation by pressing the Parameter/Access key until parameters are displayed and then pressing the
*Note: Shorter cycle times may be used
when driving heater loads directly.