User Guide

System 350 P352P Electronic Proportional Plus Integral Static Pressure Controls 7
A
dd-on Modules
The D352 Digital Pressure Display Module and Y350R
Power Module are designed to connect together and plug
into the P352P, via a connector on its right side. The
preferred order of the modules is (from left to right)
control module, power module, and display module.
D352 Pressure Display Module
The D352 receives its power, pressure, and setpoint
information from the P352P. A three-digit
Liquid Crystal Display (LCD) gives continuous
read-out of the sensed pressure. Pushing the “PRESS
FOR SETPOINT” button will cause the setpoint of the
adjoining P352P to be displayed.
Y350R Power Module
The Y350R provides a convenient method of powering
System 350 Modules from a
120 or 240 VAC power source. The Y350R supplies 24
VDC unfiltered to the modules.
A
djustments
P352P
1. Remove P352P cover by loosening the
four captive cover screws.
2. Set the RA/DA jumper blocks to the desired mode of
operation. Position the jumper blocks vertically for
RA (Reverse Acting) or horizontally for DA (Direct
Acting) (see Figure 2).
3. Adjust the throttling range potentiometer to desired
setting. Clockwise rotation increases the throttling
range.
If the P352P is to be used in proportional plus
integral mode, the initial throttling range adjustment
should not be set below 3 in. W.C. for the P352PQ-
1C and 0.15 in. W.C. for the P352PQ-2C. A narrow
proportional band used in conjunction with the
integration may result in unstable control.
4. If minimum output is required, set the minimum
output potentiometer to the desired position. Output
can be read with a voltmeter or can be adjusted using
the ten segment, front panel LED.
Note: Before setting the minimum output
potentiometer, be sure the control is not
generating an analog output signal.
For each 10% increase in range, one bar will light on
the front panel LED. In a milliampere application,
each bar equals 2 mA. In a voltage application, each
bar equals 1 volt. (See
Figure 3 for an example.)
Example: To set the P352P for a minimum output of
4 mA, turn the minimum output potentiometer
clockwise until the second LED segment lights.
Slowly back off the potentiometer counter-clockwise
until the second segment just goes out.
5. Make sure the system is stable before selecting
integration. Refer to Checkout Procedure.
6. Adjust the control to the desired setpoint and replace
cover.
Note: The P352PQ-1C setpoint at mid scale is
factory calibrated to a tolerance of
+/- 0.05 in. W.C. (The P352PQ-2C has a
midscale calibration tolerance of
+/- 0.0025 in. W.C.)
The setpoint tolerance at the extreme ends
of the setpoint scale can be
+/- 0.15 in. W.C. for the
P352PQ-1C model (+/- 0.0075 in. W.C. for
the P352PQ-2C).
The D352 Display Module is unaffected by
this tolerance shift. Use the D352 to
achieve the most accurate setpoint selection.