Red Lion PCU - Manual (Page 88)

Second Analog Input Calibration (2CAL)
The signals applied to the Second Analog Input for calibration depend on
the type of model. Second Analog Input and Motorized Valve Positioner
represent the models for which unique calibration signals are required.
Second Analog Input (Remote Setpoint)
Connect precision DC milliampere source (0.01% accuracy) to rear
terminals labeled Second Analog Input, 4 to 20 mA+ and 4 to 20 mA-.
Display Parameter Description/Comments
StP1 0.00 mA step Apply 0.00 mA DC, press PAR.
StP2 5.00 mA step Apply 5.00 mA DC, press PAR.
StP3 10.00 mA step Apply 10.00 mA DC, press PAR.
StP4 15.00 mA step Apply 15.00 mA DC, press PAR.
StP5 20.00 mA step Apply 20.00 mA DC, press PAR.
Motorized Valve Positioner
Construct a precision resistor
divider network consisting of
f o u r 2 5 0
W 0.1% tolerance
resistors connected in series as
shown in Figure 43, Resistor
Divider. Connect one end of the
r e s i s t o r s t r i n g t o t h e r e a r
t e r m i n a l l a b e l e d S l i d e w i r e
Feedback Inputs, Comm. and the
other end to Excitation. The
connection to the Wiper terminal
comes from different points of
the resistor string.
Display Parameter Description/Comments
StP1 0.0% step Connect wiper input to 0% point of divider
(Comm.), wait 10 seconds, press PAR.
StP2 25.0% step Connect wiper input to 25% point of divider, wait
10 seconds, press PAR.
StP3 50.0% step Connect wiper input to 50% point of divider, wait
10 seconds, press PAR.
StP4 75.0% step Connect wiper input to 75% point of divider, wait
10 seconds, press PAR.
StP5 100.0% step Connect wiper input to 100% point of divider
(Excitation), wait 10 seconds press PAR.
-80-
Figure 43, Resistor Divider