Johnson Controls P352PN-2 Bedienungsanleitung

System 350 Product Guide 930

Basic Controls Section

Product/Technical Bulletin P352P

Issue Date 0300

Part No. 24-7664-1911, Rev. — www.johnsoncontrols.com

Code No. LIT-930044

System 350TM P352PN Electronic Proportional Plus Integral

Pressure Controls for PSI Applications

The P352PN Series controls are electronic

proportional plus integral or proportional-only pressure

controls that generate a 0 to 10 VDC and a 0 to 20 mA

analog output signal based on sensed pressure.

Three models are available with setpoint ranges of

0-100 psi, 90-250 psi, and 240-600 psi.

The P352PN Series controls have a wide adjustable

throttling range (proportional band), as well as three

selectable integration constants.

The P352PN Series controls are housed in a NEMA 1

high-impact thermoplastic enclosure. The modular

design provides easy, plug-together connections for

quick installation and integration with specified power,

stage, and display modules.

Figure 1: P352PN Electronic Proportional Plus

Integral Pressure Control for PSI Applications

Features and Benefits

❑Modular Design Provides the flexibility to add a D352 Pressure

Display Module, S352 Stage Modules, and a

Y350R Power Module

❑Plug-together Connectors

and 35 mm DIN Rail

Mounting

Eliminates wiring between modules and

reduces installation costs

❑Three Models Cover Wide

Setpoint Ranges: 0-100 psi,

90-250 psi, and 240-600 psi

Reduces inventory while providing control for

most positive-pressure refrigeration and

HVAC applications, in three overlapping

pressure ranges

❑Adjustable Minimum Signal

Output

Allows the user to adjust the minimum output

between 0 and 60% of the output signal range

❑Wide Adjustable Throttling

Ranges: 5 to 50 psi and

10 to 100 psi

Enables user to match the range of pressure

control to specific application requirements

❑Reverse or Direct Acting

Modes

Works in a variety of pressure applications

❑Three Selectable

Integration Constants

Allows the user to adjust system recovery rate

to setpoint pressure at slow, medium, or fast

to meet application requirements

2 Basic Controls—P352PN Electronic Proportional Plus Integral Pressure Controls for PSI Applications

Application

A P352PN Series pressure control may be set as a

proportional-only control or as a proportional plus

integral control, to generate two standard analog

output signals (0 to 10 VDC and 4 to 20 mA).

The P352PN controls can be used as stand-alone

devices or in conjunction with plug-together power,

stage, and display modules.

A typical System 350pressure control application

includes the following:

•P352PN Pressure Control

•Y350R Power Module (or 24 VAC transformer)

•S352AA-2 Stage Module

•D352AA-2 Digital Pressure Display Module

•P399 Pressure Transducer

Typical P352PN pressure control applications include:

•Condenser fan speed control

•Damper positioning

•Flow valve positioning

Operation Overview

IMPORTANT: The P352PN controls are intended to

control equipment under normal

operating conditions. Where failure or

malfunction of the P352PN control

could lead to an abnormal operating

condition that could cause personal

injury or damage to the equipment or

other property, other devices (limit or

safety controls) or systems (alarm or

supervisory systems) intended to warn

of, or protect against, failure or

malfunction of the P352PN control

must be incorporated into and

maintained as part of the control

system.

The P352PN control operates on 24 VAC and provides

two analog output signals: 0 to 10 VDC and 0 to

20 mA. A 10-segment front panel LED bar graph

indicates percentage of output. Adjustable features

include:

•Setpoint

•Minimum output

•Throttling range (proportional band)

•Integration constant

•Reverse acting or direct acting mode of operation

Module Connector

Reverse Acting

Direct Acting

J1 Jumper

Positions

LED Indicator

(Percent of Output)

0 to 10 VDC Output

0 to 20 mA Output

Integration

DIP Switch

24V

VDC

THROT

RANGE

MI N

OUTPUT

PSI

Throttling Range

Potentiometer

Minimum Output

Potentiometer

Setpoint Potentiometer

Red wire to VDC

24 VAC Transformer

(If a Y350R Power Module

is not used)

White wire to SN

Black wire to C

24 VAC

Common for Analog

Outputs

120/240 VAC

WHA-P399

Wiring Harness

Connect Cable

Shield to C

P399

Transducer

Figure 2: Interior View and Typical Wiring of P352PN Control

Basic Controls—P352PN Electronic Proportional Plus Integral Pressure Controls for PSI Applications 3

Proportional-Only Controls

Proportional-only controls work by continuously

adjusting the magnitude of the control’s output signal in

proportion to the difference (input-error) between the

control’s setpoint value and the actual value sensed in

the controlled system. As load on a system increases,

the input-error to the control increases. The control

reacts by increasing the magnitude of the output

signal, driving the controlled device to respond to the

increased load. (See Figure 3.)

The advantages of proportional-only controls are that

they are easy to set up and adjust, and they provide

good stability and rapid response to changing load

conditions.

A disadvantage of proportional-only controls is they

can not maintain a system process at the exact control

setpoint. A proportional offset (or droop) is always

present when there is a steady load on the controlled

system. (See Figure 3.)

The result is that a proportional-only control maintains

a system process at a control-point instead of the

desired setpoint. Control-point is setpoint plus the

proportional offset. The greater the load on the system,

the greater the proportional offset and the further the

control-point is from the system setpoint. A

proportional-only control can not adjust the output

signal to drive a system process from the control-point

to the desired setpoint. (See Figure 3.)

Systems with proportional-only controls and large

loads or highly variable load conditions may operate at

control-points that vary significantly from the desired

setpoint.

Proportional Plus Integral Controls

The P352PN proportional plus integral (PI) pressure

control incorporates integral (or reset) control action

along with proportional-only control action. The

advantage to this is that the PI design effectively

eliminates proportional offset, and the PI control can

adjust the output signal to not only match a steady load

on the system, but also drive the system process

towards setpoint. On a properly sized system with

steady load conditions, a PI control can maintain the

system process very close to the system setpoint. (See

Figure 3.)

The speed at which the PI control drives the system

process to setpoint (recovery rate) is determined by

the system’s capacity, the size of the load, and the

integration constant set on the PI control.

The integration constant establishes the rate at which

the control re-adjusts to the load as it drives the

process towards setpoint. The faster the integration

constant, the faster the control re-adjusts the

magnitude of the output signal, and the faster the

recovery rate of a properly sized and setup system.

On traditional PI controls, the rate of re-adjustment can

become too large if the process load exceeds the

capacity of the equipment. When the controlled

equipment is at full capacity and the setpoint still

cannot be reached, traditional PI controls continue to

readjust the magnitude of the output signal. The result

is called integral windup.

The P352PN Series proportional plus integral controls

avoid integral windup with a patented circuit that puts a

dynamic ceiling on the integrator, which allows the

process to recover from an out-of-range condition

without experiencing a long period of overshoot.

It should be noted that PI controls might not be suitable

for all applications. Improperly applied PI controls may

be unstable and overshoot setpoint.

Also, PI controls require two separate adjustments that

are dependent on each other. The system must be

properly sized to handle the maximum process load,

and close observation is necessary when the PI

controls are initially set up and checked out. But on the

proper applications PI controls provide superior

accuracy and continuous setpoint control.

4 Basic Controls—P352PN Electronic Proportional Plus Integral Pressure Controls for PSI Applications

Proportional

Offset

Setpoint

Load Change

System Load

Control Point

Follows the Load

Temperature

Time

Throttling

Range

Error

Proportional Only Control

Temperature

Proportional

Offset = 0

Setpoint

Load Change

System Load

Integration adjusts the

proportional output to

bring the process to

setpoint regardless of load.

Time

Error

Proportional Plus Integral Control

Figure 3: Operation of Proportional Only vs. Proportional Plus Integral Control

Minimum Output Adjustment and LED Bar

Graph Output Indicator

The minimum output adjustment sets the minimum

signal output (in VDC or mA) that the P352PN control

provides to the controlled device. The minimum output

can be set between 0 and 60% of the output range

(up to 6 VDC or 12 mA).

Example: For a controlled device that responds to a

4 to 20 mA output signal, the minimum output must be

4 mA or 20% of the 0 to 20 mA range. (See Figure 4.)

Adjust the MIN OUTPUT potentiometer located in the

center of the circuit board. The LED bar graph will

advance one LED segment for each 10% increase in

output range. The first segment lights at 10%, the

second segment at 20% and so on, until the tenth

segment lights at 100%.

Minimum

Output

Setting (20%)

Throttling Range (psi)

Setpoint

Pressure

(Range for

P352PN-2)

(Range for

P352PN-3 or

P352PN-4)

Minimum Output Set to 20% (4 mA) and

Throttling Range Set to 50 psi for P352PN-2

or 100 psi for P352PN-3 and P352PN-4.

Output

Range

(in mAs)

100

Figure 4: Minimum Output and Throttling Ranges for

the P352PN Controls

Throttling Range (Proportional Band)

On controls set for proportional only, the throttling

range or proportional band setting establishes how far

the system pressure must deviate from the P352PN

control setpoint to generate a 100% output signal from

the control.

Thus, on a proportional only control with a throttling

range setting of 25 psi, the output signal (VDC or mA)

is 0% when the system pressure equals the setpoint

pressure. The output signal increases to 100%

(10 VDC or 20 mA) when the system pressure rises

25 psi above the setpoint in DA mode, or drops 25 psi

below the setpoint in RA mode.

When setting up controls for proportional plus integral

operation, start with the integration constant OFF (in

the proportional only mode), and set the throttling

range (or proportional band) to a wide setting (60% or

more of the total range) to assure a stable control loop.

Then set the integration constant as slow as possible.

(Refer to Integration Constant DIP Switch Settings.)

Adjust the throttling range by turning the THROT

RANGE potentiometer located under the control cover

on the center of the circuit board.

The throttling range can be adjusted from 5-50 psi on

the P352PN-2 model and 10-100 psi on the P352PN-3

and P352PN-4 models. (See Figures 4 and 5.)

Basic Controls—P352PN Electronic Proportional Plus Integral Pressure Controls for PSI Applications 5

Integration Constant DIP Switch Settings

Depending on the application, the P352PN control can

be set to operate as a proportional-only control or as a

proportional plus integral control. Refer to sections

Proportional-Only Controls and Proportional Plus

Integral Controls.

The control has three different integration constants to

choose from, which allow you to setup the control for

the optimum recovery rate for your application. Use the

Integration DIP switch shown in Figures 2 and 5, and

the guidelines below to set the control for

proportional-only or set to the integration constant rate

for proportional plus integral control.

•OFF: Switch 1 On and all others Off provide

proportional only operation. In open-loop

applications, (without feedback) select

proportional-only operation. (See Figure 5.)

•Slow: Switch 2 On and all others Off is the

slowest integration constant and is suitable for

most proportional plus integral applications. Slow

is the recommended initial setting.

•Medium: Switch 3 On and all others Off

provides a faster integration constant. If the rate of

system recovery to setpoint is sluggish when the

control is set to Slow, and the system has enough

capacity to drive the process to setpoint at a faster

rate, the Medium setting may be used.

•Fast: Switch 4 On and all others Off is the

fastest integration constant. This should be used

only in instances where the rate of change at the

transducer is extremely rapid and system capacity

is sufficient to compensate for rapid load changes.

FAST

MEDIUM

SLOW

OFF

(Proportional

Only)

Figure 5: DIP Switch for Setting Integration

Constant or Proportional Only Control

(Switch shown is set for Proportional Only Control)

Direct Acting or Reverse Acting Mode

In Direct Acting (DA) mode, the analog output signal

magnitude increases as the pressure rises. In Reverse

Acting (RA) mode, the analog output signal magnitude

increases as the pressure drops. (See Figure 5.)

Select the desired mode of operation by positioning the

two jumpers on the J1 jumper block. Position the

jumpers vertically for Reverse Acting, or horizontally for

Direct Acting. (See Figure 2.)

The Reverse Acting/Direct Acting jumpers are installed

in the Reverse Acting position at the factory.

Note: Dashed areas show throttling range possibilities

from minimum to maximum.

VDC

Throttling Range

(psi)

Setpoint

Throttling Range

(psi)

VDC

(+)

(-)

10100

Reverse Acting Direct Acting

10 100

Figure 6: Reverse and Direct Acting Throttling

Ranges (Proportional Bands) Shown in

Proportional Only Mode

(Model Depicted has 10-100 psi Throttling Range)

6 Basic Controls—P352PN Electronic Proportional Plus Integral Pressure Controls for PSI Applications

Dimensions

DIN Rail Mounts

P352P

Mounting Slots

for No. 6 Screws

3/16 (4)

1/2 (13)

2-15/16

(75)

7/16 (11)

1-9/16

(40)

5 (127)

2-3/8 (61)

1-3/16

(31)

7/8 (22)

2-3/8 (61)

1/2 in. Tradesize

Conduit Opening

Figure 7: P352PN Control Dimensions, in. (mm)

Installation and Wiring

The P352PN control is housed in a compact NEMA 1

plastic enclosure designed for standard 35 mm DIN rail

mounting. The control is not position sensitive but

should be mounted for convenient wiring and

adjustment. Four key-slot mounting holes on the back

of the control case are provided should surface

mounting be required.

Note: When mounting the P352PN control (or any

System 350 Module) to rigid conduit, attach

the hub to the conduit before securing the hub

to the control enclosure.

WARNING: Risk of Electrical Shock.

This control, and any modules

connected to it, may have more

than one power supply.

Disconnect all power supplies

before making electrical

connections to avoid possible

electrical shock or equipment

damage.

•All wiring must be installed to conform to the

National Electrical Code and local regulations. For

maximum electrical rating of control, see label

inside the control cover. Use copper conductors

only.

•The P352PN control can output a variable signal

from 0 to10 VDC or 0 to 20 mA. Connections are

made to the terminal block located in the wiring

compartment at the bottom of the case.

•Both the voltage and milliampere outputs can be

used at the same time, allowing the P352PN

control to drive two independent devices

simultaneously (off the same RA or DA ramp).

This feature may be used to drive different types of

motor actuators or variable speed drives.

Table 1: P352PN Control Wiring Terminal

Designations

Terminal

Designation Terminal Description

V0 to 10 VDC output signal

I0 to 20 mA output signal

SN 0.5 to 4.5 VDC input signal from the

pressure transducer

VDC 5 VDC power supply to the

pressure transducer

CCommon for the pressure transducer

and output signals

24V 24 volts AC

Wiring the Transducer

The P352PN controls use a P399 Pressure

Transducer to generate the 0.5 to 4.5 VDC input

signal. The transducer is wired to the control at the

terminal block at the bottom of the circuit board. Refer

to Table 2 and Figure 2 for proper wiring configuration.

Connect the cable shield to C on the terminal block.

The maximum recommended length of 22 AWG

shielded transducer cable is 250 ft (76 m). Refer to the

P399 Electronic Pressure Transducer

Product/Technical Bulletin (LIT-125515) for more

information about the pressure transducer.

Table 2: P399 Transducer Connections

Terminal and Wire Designations

P352PN Control

Terminals Transducer Cable

SN White

VDC Red

CBlack

Basic Controls—P352PN Electronic Proportional Plus Integral Pressure Controls for PSI Applications 7

Add-on System 350 Modules

The D352 Digital Pressure Display Module, S352AA-2

Stage Module, and Y350R Power Module are designed

to connect together and plug into the P352PN control.

The power module connects to the control via a

connector on the control’s right side. The display

module and stage module connects to the right side of

the power module.

D352 Pressure Display Module

The D352 display module receives its power, pressure,

and setpoint information from the P352PN control. A

3-digit Liquid Crystal Display (LCD) gives continuous

read-out of the sensed pressure. Pushing the PRESS

FOR SETPOINT button on the display module displays

the P352PN control setpoint. Refer to System 350

D350 Display Modules Product/Technical Bulletin,

LIT-930070 for more information.

Y350R Power Module

The Y350R power module provides a convenient

method of powering System 350 Modules from a

120 or 240 VAC power source. The power module

supplies power to all of the modules. Refer to

System 350 Y350R Power Module Product/Technical

Bulletin, LIT-930090, for more information.

S352AA-2 ON/OFF Stage Module

The S352AA-2 stage module provides ON/OFF

pressure control based on the P5352PN control

setpoint and the stage module offset. Refer to

System 350 S350A Temperature, S351A Humidity,

and S352A Pressure Stage Modules

Product/Technical Bulletin, LIT-930080, for more

information.

Adjustments

Use the following procedure to set up and adjust the

P352PN pressure control.

1. Remove its cover by loosening the four captive

cover screws.

2. Set the RA/DA jumper blocks to the desired mode.

Position the jumper blocks vertically for RA or

horizontally for DA mode. See Reverse or Direct

Acting Mode section and Figure 2.

3. Adjust the throttling range potentiometer to desired

setting. Rotate clockwise to increase the throttling

range. Refer to Throttling Range (Proportional

Band) section and Figure 2.

Note: If the P352PN control is to be used in

proportional plus integral mode, the initial

throttling range adjustment should not be set

below 30 psi for the P352PN-2 model or 60 psi

for the P352PN-3 and P352PN-4 models. 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. The

10-segment LED bar graph or a voltmeter can be

used to read the minimum output. See Minimum

Output Adjustment section and Figure 2.

Note: Before setting the minimum output, verify

that the minimum output potentiometer is

set to zero (turned fully counterclockwise),

and that no LEDs are lit on the LED bar

graph.

For each 10% increase in output, the LED bar

graph will advance one LED segment

(only one bar is lit at anytime). In a milliampere

application, each bar equals 2 mA. In a voltage

application, each bar equals 1 VDC.

Example: To set the control for a minimum output

of 4 mA, slowly turn the minimum output

potentiometer clockwise until the second LED

segment just lights.

5. Adjust the P352PN control to the desired setpoint,

replace cover, and place the system in operation.

Table 3 gives the tolerances for setpoint readings

at mid scale and scale-end.

Note: The D352 Display Module is unaffected by

these tolerance shifts. Use the display module

to achieve the most accurate setpoint

selection.

Table 3: Setpoint Mid-scale and Scale-end

Tolerance Values

Control

Model

Mid-scale

Tolerance

Scale-end

Tolerance

P352PN-2 ±1.5 psi ±2.5 psi

P352PN-3 ±1.5 psi ±3.5 psi

P352PN-4 ±3.5 psi ±8 psi

6. Make sure the operating system is stable before

setting the integration constant (if necessary).

Refer to the Checkout Procedure section and

Integration Constant DIP Switch Settings when

setting the integration constant.

8 Basic Controls—P352PN Electronic Proportional Plus Integral Pressure Controls for PSI Applications

Checkout Procedure

Proportional-only and proportional plus integral

controls should be carefully set up and then check out

during system operation. Use the following guidelines

to check out the P352PN controls:

1. Before applying power, make sure installation and

wiring connections are according to job

specifications.

2. After all electrical connections have been checked,

and any necessary adjustments have been made,

put the system in operation and observe at least

three complete operating cycles to determine that

the system is stable.

3. If integration is required, select slow, medium, or

fast. The slow integration constant is the

recommended initial setting. (Refer to the

Integration Constant DIP Switch Settings section.)

4. Put the system back into operation. Observe system

operation and make any additional adjustments

necessary to obtain stable process control.

Troubleshooting

If the System 350 control modules do not appear to

function properly, verify that the proper mode

(RA or DA) has been selected on each control module.

Then perform the following procedures (in the listed

order) to determine the problem.

IMPORTANT: The control and the controlled

equipment must be powered, and

operating at a stable pressure to

perform many of the following

procedures.

WARNING: Risk of Electrical Shock.

To perform many of the following

procedures it is necessary to

power the control and the

controlled equipment while the

control cover is removed. Do not

touch any exposed metal control

components with anything other

than properly insulated tools or

insulated probes of the digital

voltage meter. Failure to use

properly insulated tools and

probes can result in severe

electrical shock.

Equipment Needed:

•reliable pressure gauge connected near the

transducer

•reliable and accurate Digital Voltmeter (DVM)

capable of measuring AC voltage and DC voltages

down to + or – 0.1 VDC in the 0 to 10 VDC range

1. Check for proper supply voltage to the P352

Control.

a. Before powering control and equipment, check

to assure that all of the wiring is correct and all

of the connections are tight.

b. With the DVM, check the voltage between the

24V and the COM terminals on the terminal

block on the upper left side of the control.

If an external 24 VAC transformer powers

the P352 control, select AC volts on the DVM.

The voltage should be between 20 and 30 VAC.

If a Y350R Power Module powers the P352

control, select DC volts on the DVM. The

voltage should be between 16 and 38 VDC.

c. If the DVM reading is within the indicated

voltage range, proceed to Step 2.

d. If the DVM reading is not within the indicated

voltage ranges, replace the external

transformer or the Y350R Power Module, and

recheck for proper supply voltage.

2. Check the for proper supply voltage to the

pressure transducer.

a. Select DC volts on the DVM and measure the

voltage between VDC and the COM terminals

on the terminal block on the upper left side of

the control.

The voltage should be 5.0 VDC

(+ or – 0.1 VDC). If the voltage is in this range

proceed to Step 3.

b. If the voltage is out of this range, power down

the controlled equipment and disconnect it

from the control. Disconnect the transducer

from the control. With the control powered,

measure the voltage between VDC and the

COM terminals on the terminal block on the

upper left side of the control.

The voltage should be 5.0 VDC

(+ or – 0.1 VDC). If the voltage is in this range,

replace the transducer.

c. If the voltage is out of range, replace the

control.

Basic Controls—P352PN Electronic Proportional Plus Integral Pressure Controls for PSI Applications 9

3. Check pressure transducer for proper output

signal voltage.

a. Measure and record the voltage between the

SEN and the COM terminals on the control

terminal block. Vo= _______

b. At the same time observe and record the

pressure reading. psiT= _______

c. The transducer output signal voltage (Vo)

increases proportionally to an increase in the

pressure at the transducer (psiT). Use the

graph in Figure 8 to compare the measured

signal voltage to the measured pressure. Or

use the formula below to compare the voltage

and pressure values.

psi

(V - 0.5V) x 4V

max

psiT= Pressure measured at transducer

Vo= Transducer output signal voltage (VDC)

Pmax = Transducer pressure range maximum

100 psi 500 psi 750 psi

(10%)

(90%)

(50%)

Pressure Range

Signal Output Voltage

(% of Supply VDC)

4.5 VDC

2.5 VDC

0.5 VDC

Control Model Number

Figure 8: Transducer Pressure vs.

Output Signal Voltage

Example:

The measured pressure at the gauge is

approximately 245 psi, the measured voltage

is 2.5 VDC (Vo), and the transducer’s rated

range is 0 to 500 psi (Pmax). Use the formula

above to calculate the pressure you would

expect from the measured voltage.

(2.5V - 0.5V) x 4V

500

psi

= 250

psi

Since the measured pressure of 245 psi is

close to the pressure calculated from the

measured voltage (250 psi), the transducer

output voltage should be considered within the

desired range.

4. Check the P352PN control for proper operation.

Perform Steps 1-3 first.

a. Record the current setpoint, integration

constant, and throttling range in Table 4 below.

Table 4: Record of Current Settings

Current P352PN Control Settings

Setpoint

Integration Constant

Throttling Range

b. Set integration constant to OFF (proportional

only). See Integration Constant section.

c. Disconnect all power to the system and

control.

d. Disconnect the equipment from the control.

e. Reconnect power to the control.

f. Verify that the power supply and transducer

are connected properly.

g. Use an accurate gauge to take an independent

pressure reading at the transducer. (This

procedure requires a minimum of 30 psi static

pressure at the transducer.)

h. Set the P352PN control to Direct Acting mode.

Refer to Figure 2.

i. Adjust the throttling range potentiometer to

approximately 25 psi.

j. Observe the LED display while adjusting the

setpoint for each of the settings listed in

Table 5. If the display varies substantially from

these values, replace the control.

Table 5: Output at Select Setpoint Settings

Setpoint Setting Approximate Output

Expected

At or Above Transducer

Reading No LED bars lit

12 to 13 psi Below

Transducer Reading 4 or 5 LED bars lit

25 psi Below Transducer

Reading All LED bars lit

k. Reconnect the equipment to the control. Reset

the control to the original settings (Table 4),

and reconnect power to the system.

l. Observe the system for a minimum of three

operating cycles. If the system still does not

perform properly, check application settings,

and replace the control if it does not operate

as expected for those settings.

10 Basic Controls—P352PN Electronic Proportional Plus Integral Pressure Controls for PSI Applications

5. Check the stage modules for proper operation.

If stage modules are not used, skip this step.

Perform Steps 1-4 first.

a. Determine and record if the control is

in the DA or RA mode of operation.

b. Determine the differential setting.

c. Observe and record the offset setting.

d. Observe and record the system

pressure at the gauge.

e. If the stage module is in the DA mode,

adjust the setpoint setting to a value lower than

the observed gauge pressure. If the stage

module LED is not lit, turn the control setpoint

adjustment knob counterclockwise until the

LED lights.

f. With the stage module LED lit, slowly turn the

control setpoint adjustment knob clockwise

(to increase the setpoint setting) until the LED

goes off. Observe the control setpoint, which

should be the same as the gauge pressure

minus the offset setting when the stage

module LED goes off.

g. Next turn the setpoint adjustment slowly

counterclockwise until the stage module LED

lights again. Observe the control setpoint,

which should be equal to the gauge pressure

minus the differential setting and offset setting

when the LED is lit.

h. If the control is in the RA mode, adjust the

setpoint setting to a value higher than the

observed gauge pressure. If the stage module

LED is not lit, turn the setpoint adjustment

knob clockwise until the LED lights.

i. With the stage module LED lit, slowly turn the

setpoint adjustment knob counterclockwise

(to decrease the setpoint setting) until the LED

goes off. Observe the control setpoint, which

should be equal to the gauge pressure plus

the offset setting when the LED went off.

j. Next turn the setpoint adjustment slowly

clockwise until the stage module LED lights

again. Observe the control setpoint, which

should be equal to the gauge pressure plus

the offset and differential settings.

6. Check the display module for proper operation.

If a display module is not used, skip this step.

Perform Steps 1-5 first.

a. Check the gauge pressure at the transducer

(psi).

b. If the display module does not display the

(approximate) pressure measured at the

gauge, replace the display module.

c. Pressing the button on the display module

should display the current setpoint setting.

d. If the displayed setpoint is out of the control’s

setpoint pressure range (check scale-plate at

the setpoint knob for control’s pressure range)

replace the control.

e. If pressing the SETPOINT button results in a

reading other than the expected setpoint

value, check the setpoint setting and correct if

necessary. If the display continues to read an

incorrect value, replace the display module.

Note: If the control and add-on modules all appear to

be operating properly, but the field device still

does not turn on and off as expected, check

the wiring from the control or stage module to

the field device.

Table 6: S352AA-2 Stage Module Output Relay Troubleshooting

Operating Mode LED N.O. Contact Position Setpoint Setting equals approximately…

Reverse Acting (RA) ON Closed (gauge pressure) +offset +differential

Reverse Acting (RA) OFF Open (gauge pressure) +offset

Direct Acting (DA) ON Closed (gauge pressure) -offset -differential

Direct Acting (DA) OFF Open (gauge pressure) -offset

Repairs and Replacement

Do not make field repairs or perform calibration. The

P352PN Pressure Controls and the P399 Transducer

are available through local Johnson Controls

representatives.

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