PXU100B0 Datasheet, PDF (15/32 Pages) Red Lion Controls. Inc – MODEL PXU - TEMPERATURE/PROCESS CONTROLLERS

OUTPUT 2 POWER LOWER LIMIT
2L  _{.0 to 0. %}
 0.
This parameter may be used to limit controller power at the lower end due to
process disturbances or setpoint changes. Enter the safe output 2 low power
limit for the process. When the controller is in USEr or OnOF Control Mode, this
limit does not apply.
OUTPUT 2 POWER UPPER LIMIT
2H  _{.0 to .0 %}
 .0
This parameter may be used to limit controller power at the upper end due to
process disturbances or setpoint changes. Enter the safe output 2 high power
limit for the process. When the controller is in USEr or OnOF Control Mode, this
limit does not apply.
 
 0
RELATIVE GAIN
1 to 99.99
This defines the gain of OP2 relative to OP1. It is generally set to balance the
effects of cooling to that of heating(r1d2) or vice versa (d1r2). This is
illustrated in the Heat/Cool Relative Gain Figures below. After completion of
Auto-Tune, this parameter will be changed.
 
2
DEADBAND/OVERLAP
 to 
This defines the deadband area between the bands (positive value) or the
overlap area in which both heating and cooling are active (negative value). If a
heat/cool overlap is specified, the percent output power is the sum of the heat
power and the cool power. The function of Deadband/Overlap is illustrated in
the Control Mode Explanations.
INPUT FAIL OP2 POWER LEVEL
IF02  .0 to 0. %
 0.
This parameter sets the power level in the event of an input failure (open TC/
RTD or shorted RTD). Manual (USEr) Control overrides the input fail preset.
ON/OFF CONTROL HYSTERESIS
 
2
2 to 
The On/Off Control Hysteresis (balanced around the setpoint) eliminates
output chatter. The control hysteresis value affects both OP1 and OP2 control.
The hysteresis band has no effect on PID Control. On/Off Control Hysteresis is
illustrated in the Control Mode explanations.
Shaded parameters are programming/model dependent.
HEAT/COOL RELATIVE GAIN FIGURES
OP1
100%
%
OUTPUT
POWER
2X PROPORTIONAL
BAND
HEAT
COOL
OP2
100%
TEMPERATURE
SETPOINT
Deadband/Overlap = 0
%
OUTPUT
POWER
DEADBAND
NEGATIVE VALUE
OP1
100%
RELATIVE GAIN
2
1
.5
HEAT
RELATIVE GAIN = .5
COOL
SETPOINT
Deadband/Overlap < 0
OP2
100%
TEMPERATURE
%
OUTPUT
POWER
OP1
100%
DEADBAND
POSITIVE VALUE
RELATIVE GAIN
2
1
.5
OP2
100%
HEAT
SETPOINT
RELATIVE GAIN = .5
COOL
Deadband/Overlap > 0
TEMPERATURE
15