Red Lion PCU - Manual (Page 76)

FLOW RATE PROGRAMMING EXAMPLE
A plastics manufacturer needs to maintain a constant flow rate on a feed
stock pipeline to insure their product stays within specification. A PCU is
installed to maintain the flow by controlling a proportional control valve.
The output of the flow meter is 0 to 10 VDC. The control valve is positioned
by an electric actuator that requires a 4 to 20 mA control signal.
The following is a list of the parameter values keyed-in to the controller.
Configure Input Parameters
tYPE VOLT Set input signal for voltage
dCPt 0.0 Scaled display to indicate in tenths
rnd 0.1 No rounding of the display
FLtr 1 Normal input signal filtering
dSP1 0.0 Display value for scaling point 1 is 0.0
INP1 0.00 Signal value for scaling point 1 is 0.00
dSP2 100.0 Display value for scaling point 2 is 100.0
INP2 10.00 Signal value for scaling point 2 is 10.00
SPLO 0.0 Limit min. setpoint value to 0.0 units
SPHI 110.0 Limit max. setpoint value to 110.0 units
SPrP 0.1 Setpoint ramp rate = 0.1 units/minute
INPt trnF Allow remote switching of auto/manual mode
Configure Output Parameters
CYCt 0 Main control output and indicator off
OPAC rEV Main control output is reverse acting
OPLO 0 Limit min. controller power to 0%
OPHI 100 Limit max. controller power to 100%
OPFL 0 Controller output power to 0 if input overdrive
signal is detected
OPdP 2.0 Output power dampening = 2.0
CHYS 0.1 Control hysteresis set for 0.1
tcod 0 Select fastest response
ANAS OP Linear DC output used for control
ANLO 0.0 Control valve provides full deflection for 4 to
20 mA signal range
ANHI 100.0
Andb 2.5 Impose 2.5% deadband on Linear DC output
ANut 2 Update output once every 2 seconds
Configure Alarm Parameters
Act1 A-HI Set alarm #1 for absolute high acting
rSt1 LAtC Alarm set for latching
Stb1 YES Disable alarm during power-up
AL-1 90.0 Set alarm value for 90.0
Act2 A-LO Set alarm #2 for absolute low acting
rSt2 LAtC Alarm set for latching
Stb2 YES Disable alarm during power-up
AL-2 20.0 Set alarm value for 20.0
AHYS 0.1 Alarm activation hysteresis set for 0.1
-68-
}