Figure 10. Typical Lag Processes
Parameter
Descriptions
Setting Rate (Derivative) or Reset (Integral) to [ 00 ] disables that aspect of PID control. The ratio
for non-zero settings 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 Hysteresis 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.
- Adequate power and excellent load/sensor coupling.
nL = Normal recovery with no overshoot. For two-lag processes.
- Properly sized heaters or components and good load/sensor coupling.
Hi = Slow recovery with no overshoot. For three-lag processes.
- Overpowered with multiple lags. Poor load/sensor coupling.
Off = Autotune disabled; manual output control.
Display Parameter Available Selections
Gn.o1
Gain Output 1 (PID heat
gain)
0 to 400 - value may exceed 400 during autotuning
Gr.o2
Gain Ratio Output 2 (PID
cool gain ratio)
0 to 20
H.HYS
Heat Hysteresis
01 to100 - degrees
C.HYS
Cool Hysteresis
0 to100 - degrees
HYS1
Output 1 Hysteresis
0 to100 units
HYS2
Output 2 Hysteresis
0 to100 units
SPr.2
Spread Adjustment,
Output 2
0 to100 units
C.SPr
Cool Spread
0 to100 - degrees
rAtE
PID rate
0 to 900 seconds
rSEt
PID reset
0 to 3600 seconds
dPnG
Damping
Lo , nL , Hi , Off
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