Samson 3430 User manual

Series 430
Pneumatic Indicating Controllers
Type 3430
Fig. 1 · Controller stations
Mounting and
Operating Instructions
EB 7030 EN
Edition October 2010
Type 3432 Controller Station
– with Type 3435 Transmitter Module for Pressure
– with Type 3436 Transmitter Module for Temperature
– with Type 3438 Transmitter Module for Temperature (Pt 100)
– for standardized signals
Version shown with lockable door and integrated
Type 3436 Transmitter Module for Temperature
Type 3431 Controller Station
– for standardized signals

Contents Page
1 Application. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2.1 Settings at the controller modules . . . . . . . . . . . . . . . . . . . . 4
2.1.1 Operating action . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2.1.2 Air supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2.1.3 Proportional-action coefficient Kp . . . . . . . . . . . . . . . . . . . . 6
2.1.4 Reset time Tn . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.1.5 Rate time Tv. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.1.6 Operating point. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.2 Setting the limit switches. . . . . . . . . . . . . . . . . . . . . . . . . 7
3 Commissioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3.1 Tuning the controller . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3.1.1 Setting the operating point in P and PD controllers . . . . . . . . . . . . 9
3.2 Smooth automatic/manual mode changeover . . . . . . . . . . . . . 10
3.3 Smooth changeover between the internal and external reference variable 10
3.4 Readjusting the controller’s zero point . . . . . . . . . . . . . . . . . 10
4 Construction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
5 Principle of operation . . . . . . . . . . . . . . . . . . . . . . . . . 11
5.1 Transmitter modules . . . . . . . . . . . . . . . . . . . . . . . . . . 11
5.2 Controller station . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
5.3 Controller modules. . . . . . . . . . . . . . . . . . . . . . . . . . . 14
5.3.1 Type 3433 Controller Modules . . . . . . . . . . . . . . . . . . . . . 14
5.3.2 Type 3434 Controller Modules . . . . . . . . . . . . . . . . . . . . . 17
5.4 Additional modules . . . . . . . . . . . . . . . . . . . . . . . . . . 18
5.4.1 Type 6112 i/p Converter . . . . . . . . . . . . . . . . . . . . . . . 18
5.4.2 wint/wext selector switch . . . . . . . . . . . . . . . . . . . . . . . . 18
5.4.3 Supply pressure regulators . . . . . . . . . . . . . . . . . . . . . . . 18
5.4.4 Inductive limit switches . . . . . . . . . . . . . . . . . . . . . . . . . 19
6 Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
6.1 Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
6.1.1 Changing scales. . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
6.2 Installing the temperature sensor . . . . . . . . . . . . . . . . . . . . 22
7 Connections. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
7.1 Pneumatic connections . . . . . . . . . . . . . . . . . . . . . . . . . 24
7.1.1 Typical applications . . . . . . . . . . . . . . . . . . . . . . . . . . 24
7.1.2 Adjusting the supply air for version with supply pressure regulator. . . . 25
7.2 Electrical connection . . . . . . . . . . . . . . . . . . . . . . . . . . 26
2EB 7030 EN
Contents

8 Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
8.1 Checking the air supply . . . . . . . . . . . . . . . . . . . . . . . . 27
9 Conversion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
9.1 Changing the controller function . . . . . . . . . . . . . . . . . . . . 28
9.2 Exchanging the transmitter module . . . . . . . . . . . . . . . . . . . 30
9.3 Checking the controller function . . . . . . . . . . . . . . . . . . . . 30
10 Use in hazardous areas . . . . . . . . . . . . . . . . . . . . . . . . 31
10.1 Servicing explosion-protected devices . . . . . . . . . . . . . . . . . 31
11 Technical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Certificates . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
EB 7030 EN 3
Contents
General safety instructions
4
The device may only be assembled, started up or operated by trained and
experienced personnel familiar with the product.
According to these mounting and operating instructions, trained personnel is
referred to as individuals who are able to judge the work they are assigned
to and recognize possible dangers due to their specialized training, their
knowledge and experience as well as their knowledge of the relevant
standards.
4
Explosion-protected versions may only be operated by personnel who have
undergone special training or instructions or who are authorized to work on
explosion-protected devices in hazardous areas.
4
Any hazards that could be caused by the signal pressure are to be
prevented by means of the appropriate measures.
4
Proper shipping and appropriate storage of the device are assumed.

1 Application
The Series 430 Pneumatic Indicating Con-
trollers are used for applications in process
automation and industrial plants.
The controllers directly measure the con-
trolled variables (pressure, temperature,
electric or pneumatic standardized signal)
and display the value. They compare the
measured variable with the set point and is-
sue a corresponding pneumatic control sig-
nal from 0.2 to 1 bar (3 to 15 psi).
A supply pressure of 1.4 bar ±0.1 bar
(20 psi ±1.5 psi) is required or an operat-
ing pressure of 2 to 12 bar (30 to 180 psi)
when a supply pressure regulator is in-
stalled.
2 Operation
2.1 Settings at the controller
modules
The controller module in the station can be
accessed after the lock (Fig. 2) has been re-
leased and the indicating unit (5) has been
opened out.
The settings for operating action (turnboard
A) and air supply (turnboard B) must be
performed prior to commissioning.
4Unscrew the mounting screw (6) on the
controller module. Pull it off its self-seal-
ing hose fittings and lift out of the con-
troller station.
2.1.1 Operating action
The operating action for the control loop is
set at the turnboard A(Fig. 2), where the
position of its arrow symbol according to the
arrow symbol on the controller module de-
termines the operation action of the control-
ler.
34Arrow tips facing opposite
directions:
Operating direction:
Increasing/decreasing =
As the controlled variable x increases,
the output signal pressure y
decreases.
44Arrow tips facing the same direction:
Operating direction:
Increasing/increasing
As the controlled variable x increases,
the output signal pressure y
increases.
4EB 7030 EN
Application

Fig. 2 · Turnboards and adjusters
1 Controller station (Type 3432)
1.1 Scale
1.3 Actual value pointer (red)
1.4 Set point adjuster
2 Transmitter module
or connecting base
3 Controller module
3.1 Comparator
3.2 Connecting plate
3.3 Hex screws
3.4 Screws (inside)
4 Lock
5 Indicating unit
6 Mounting screw
7 Restriction
8 Zero adjuster
9 Kp adjuster
10 Tn adjuster
11 Tv adjuster (only in
PD or PID controller)
12 Operating point adjuster
(only in P or PD controller)
Type 3432 Contr. Module
Side view without comparator
1
1.3
1.1
4
1.4
5
2
B
10
12
11
3.3
3
6
7
A3.2 3.4 8 9 3.1
A
8
63109
Oper. action
Type 3433-2 (PI) Controller Module Type 3434-2 (PI) Controller Module
Air supply Oper. action
Setting or modifying the operating direction:
Unfasten the screw in turnboard A(Fig. 2)
and lift it off together with the turnboard. If
necessary, lever the board at the side.
Do not lose the rubber seal.
4Turn the board by 90° so that the re-
quired arrow is aligned with the arrow
on the base plate.
4Insert board and tighten screw.
4Reassemble the controller module in the
controller station.
2.1.2 Air supply
(only with Type 3433 Controller Module)
The position of the turnboard B(Fig. 2) with
its arrow symbol determines the air supply
to the feedback bellows. It can be accessed
after the comparator (3.1) has been re-
moved.
4yA Normal air supply, approx. 1 mn³/h
per % of the system deviation
4RLarge air supply, approx. 3 mn³/h
per % of the system deviation
(not with P or PD controller modules)
EB 7030 EN 5
Operation

4Unfasten screws (3.3) and pull off the
connecting plate (3.2) together with nuts
and bolts from the controller module.
4Unscrew the hexagonal socket-head
screws (3.4) at the side and lift the com-
parator (3.1) out of the controller mod-
ule.
Setting or modifying the air supply:
4Unfasten screw in turnboard Band lift it
off together with the turnboard. If neces-
sary, lever the board at the side.
Do not lose the rubber seal.
4Turn the board so that the arrow is
aligned with the mark yA or Ron the
controller module. Insert board and
tighten screw.
4Reassemble the controller module in the
controller station.
2.1.3 Proportional-action
coefficient Kp
The setting of the KP(adjuster 9) determines
the controller gain and is related to the con-
trolled system that is being tuned (section
3.1).
2.1.4 Reset time Tn
Controller versions with integral-action com-
ponent require the reset time to be set at the
restriction (10). The setting depends on the
controlled system that is being tuned
(section 3.1).
2.1.5 Rate time Tv
For Type 3433 Controller versions with de-
rivative-action component, the rate time Tv
needs to be set at the restriction (11). The
setting depends on the controlled system that
is being tuned (section 3.1).
2.1.6 Operating point
Controller modules without integral-action
component such as P or PD controllers have
an operating point. In Type 3433 Controller
Module, it can be adjusted between 0 and
100 % which corresponds to 0.2 to 1 bar by
an operating point adjuster (12). The setting
depends on the manipulated variable y (sec-
tion 3.1.1).
In Type 3434 P Controller Module, the oper-
ating point is fixed at 0.6 bar.
6EB 7030 EN
Operation

2.2 Setting the limit switches
Only applies to controller stations with the
limit switch option:
To set the limit switches, first release the lock
(4, Fig. 2) and open out the indicating unit
(5). The contacts can be accessed at the
back.
Adjust proximity switches by placing a
screwdriver in the clamps between 0 and
100 % of the reference scale and move until
a contact is made over the connected switch-
ing amplifier.
EB 7030 EN 7
Operation
Fig. 3 · Limit switches
Clamps with proximity switch

3 Commissioning
Prior to commissioning the control loop,
check all devices to make sure they are con-
nected correctly, do not leak and function
properly.
Release lock (4) and open out the indicating
unit (5) to enable easy access to the operat-
ing controls at the controller.
Check the turnboard to make sure the cor-
rect operating action is set at the controller
(see section 2.1.1).
3.1 Tuning the controller
The controller needs to be tuned to the char-
acteristics of the controlled system using the
KPand Tnand/or Tvadjusters at the control-
ler module to ensure that the controller can
keep any system deviations for all set points
caused by the disturbance variables to zero
or at least to minimize them.
In case of controller stations which have a
manual/ automatic switch (1.6), the plant
must be started up manually.
We recommend to determine the settings by
using a tuning test (following the Ziegler and
Nichols method) which produces sufficient
results in most cases:
1. Apply supply air (1.4 ±0.1 bar).
2. Set the proportional-action coefficient KP
to a low value at the comparator.
3. Set Tnrestrictor to its maximum value
and Tvto its lowest value (applies only to
PI and PID controllers).
Setting in manual mode:
4. Set manual/automatic switch to Manual.
5. Operate manual adjuster (1.7) for the
control signal so that the controlled vari-
able (actual value pointer 1.3) slowly
settles on the adjusted set point (set point
pointer 1.4).
Should the differential pressure indicator
(1.8) move to zero, set the manual/auto-
matic switch (1.6) to Automatic.
Proceed as described in points 6 and 7.
Setting in automatic mode:
4. Set the set point to the required value at
the rotary knob (1.4) on the indicating
unit.
5. Set the Tnrestriction briefly to its lowest
value (completely open) to move the red
8EB 7030 EN
Commissioning
Fig. 4 · Front view
1.8
1.6
1.5
1.7
1.3
1.4
4
5
1.3 Actual value pointer (red)
1.4 Set point adjuster with green pointer
1.5 Signal pressure display
1.6 Manual/automatic switch
1.7 Adjuster for signal pressure (manual)
1.8 Differential pressure indicator
4 Lock
5 Indicating unit

actual value pointer to the green set
point pointer. Close the Tnrestriction
again.
6. Starting from a low value, increase the
proportional-action coefficient KPuntil
the actual value pointer displays an har-
monic oscillation pattern (uniform oscil-
lation amplitudes as shown in Fig. 5) of
the controlled variable.
If oscillations do not arise with a large
KPsetting, turn the rotary knob to
change the set point slightly and then re-
turn it to its former setting. It may be
necessary to increase the gain (KP)
slightly until an harmonic oscillation pat-
tern arises.
7. Write down the adjusted value of the KP
scale you have just adjusted as the criti-
cal proportional-action coefficient KPkrit.
Use a stopwatch to time the oscillation
time for one entire oscillation as Tkrit (PI
and PID controller only).
Multiply both values with the values in
the table (Fig. 5) and set as the favor-
able settings for KP, Tn, and Tvat the
controller.
Should oscillations still occur despite these
settings, slightly reduce KPand increase Tn.
Repeat these steps, if necessary, until the
control loop shows a satisfactory perfor-
mance. Leave enough time in between set-
ting to allow the controller to stabilize.
3.1.1 Setting the operating point in
P and PD controllers
(Type 3433 Controller Module only)
After setting the proportion-action coefficient
KPas described previously, set the operating
point for P and PD controllers instead of the
reset time Tn.
4Read off the controlled variable yA of the
controller at the display (1.5) when the
plant is in a steady-state condition and
set this value directly at the operating
point adjuster (12, Fig. 2). (Setting 0.2 to
1 bar = 0 to 100 %).
4Recorrect slightly until the system devia-
tion is zero. In case the signal pressure
display deviates, average the value.
Note!
On changing set point or reference variable,
the operating point must be set again as de-
scribed above.
If the reference variable is changed more of-
ten, set the operating point to 0.6 bar =
50 % (average value).
EB 7030 EN 9
Commissioning
Fig. 5 · Harmonic oscillation, settings
Cntr. KPTnTv
P 0.50 · KP,krit
PI 0.45 · KP,krit 0.85 · Tkrit
PID 0.59 · KP,krit 0.50 · Tkrit 0.12 · Tkrit
Controlled variable
(actual value)
Tkrit
Tkrit
–
+

Note!
The T
n
restriction must be completely opened
with a P/PI controller is switched over to P
action to allow the operating point adjuster
to work without delay.
Version with w-dependent operating point
This version does not need to be adjusted
since the operating point automatically fol-
lows the set point w.
3.2 Smooth automatic/manual
mode changeover
(only for controller station with manual/au-
tomatic changeover, Fig. 4)
The smooth switchover ensures that no pres-
sure surges can reach the valve when the
manual/automatic switch is activated as fol-
lows:
Changeover from automatic to manual
Use the manual adjuster (1.7) to adjust
signal pressure manual yH until the differen-
tial pressure indicator (1.8) is zero. Switch
over to manual at the switch.
Changeover from manual to automatic
If the plant is to be controlled manually to
the required value, the automatic signal
pressure yA must be matched to the manual
signal pressure yH by adjusting the set point
adjuster (1.4).
The switch (1.6) can only be set to automatic
after the differential pressure indicator (1.8)
is at zero.
Set the set point again to the required value.
3.3 Smooth changeover between
the internal and external re-
ference variable
When combining the fixed set point control
and follower control, the Type 3432 Con-
troller Station is equipped with a wint/wext
switch, a pressure adjuster and a differential
pressure indicator (Fig. 10).
The differential pressure indicator must first
be brought to zero by activating the pres-
sure adjuster in order to switch between the
reference variables.
3.4 Readjusting the controller’s
zero point
Should deviations arise between the actual
value and set point during operation, the
zero point adjustment can be readjusted by
turning the zero screw at the back of the dis-
play unit (5) until the actual value and set
point on the front display are the same
again.
Deviations between the actual value and set
point can also be corrected at the zero point
adjuster (8, Fig. 2) of the controller module.
10 EB 7030 EN
Commissioning
Differential pressure indicator
With Without deviation

4 Construction
The controllers designed according to the
modular principle form an entire automation
unit consisting of a controller station, a con-
troller module tuned to the local conditions,
and, where applicable, a transmitter as well
as other additional modules.
Controllers with Type 3432 Controller Sta-
tion are mainly designed for installation of a
Type 3435 Transmitter Module for Pressure
or a Type 3436 Transmitter Module for
Temperature with direct process fluid con-
nection.
The Type 3431 Controller Station receives
the controlled variable as a standardized
signal from 0.2 to 1 bar or 3 to 15 psi. The
controlled variable can also be supplied as
a current signal from 4 or 0 to 20 mA or
1 to 5 mA over an integrated i/p converter.
The controller station can be equipped with
the Type 3433 or Type 3434 Controller
Module.
For special control applications, the Type
3433 Controller Module can be combined
with Type 3437 Additional Modules for
pressure limitation, control mode switchover
or smooth manual/automatic transfer.
The controller station can also be upgraded,
if required, with a manual/automatic trans-
fer, consisting of a selector switch, adjuster
for manual mode, and differential pressure
indicator.
The controller station must be equipped with
an additional module for wint/wext change-
over when used for applications as a com-
bined fixed set point controller and follower
controller. An additional pneumatic or elec-
tric output for the external reference variable
wext (e.g. 0.2 to 1 bar or 4 (0) to 20 mA)
is likewise required when used as a follower
controller. Additionally, inductive limit
switches, that are adjustable at a scale, can
be mounted on the indicating units 1 or 2.
Note! Refer to the corresponding Data
Sheets for details about the controller sta-
tions and their controller modules.
T 7030 EN · Pneumatic Indicating
Controllers - Information Sheet with product
overview.
T 7032 EN · Pneumatic Indicating
Controllers for Pressure
T 7034 EN · Pneumatic Indicating
Controllers for Temperature with Capillary
Sensor
T 7036 EN · Pneumatic Indicating
Controllers for Temperature with Pt 100
Resistance Thermometer
T 7038 EN · Pneumatic Indicating
Controllers for Standardized Signals
T 7040 EN · Type 3433 Pneumatic
Controller Modules and Type
3437Additional Modules
T 7041 EN · Type 3434 Pneumatic
Controller Modules
T 7045 EN · Type 6112 i/p Converter
Module
5 Principle of operation
5.1 Transmitter modules
Type 3435 for Pressure
The process fluid pressure p is transmitted to
the transmitter module (2) where it causes a
deflection at the Bourdon tube measuring
EB 7030 EN 11
Construction

system (2.1). The deflection is converted by
the pneumatic servo system (2.2) into a
pneumatic signal (controlled variable x)
which is proportional to the pressure p. The
signal is transferred to the bellows measur-
ing system of the actual value display (1.3)
as well as to the controller module (3).
Type 3436 for Temperature with capillary
sensor
The temperature of the medium produces a
pressure in the gas-filled sensor (2.3) of the
transmitter module which is proportional to
the temperature. This pressure is offset by a
force on the beam (2.4) and converted into
the output pressure pAat the feedback bel-
lows (2.6).
The supply air flows over the restriction (2.9)
and nozzle (2.8) and hits the flapper (2.7).
As the temperature rises, the flapper moves
closer to the nozzle. This results in an in-
crease in output air pressure pAsupplied to
the bellows (2.6) until a new state of equilib-
rium is reached, i.e. until the output signal is
proportional to the temperature measured.
This signal is transmitted as the actual value
signal (controlled variable x) to the bellows
measuring system of the actual value display
(1.3) and the controller module (3).
Type 3438 for Temperature with Pt 100 re-
sistance thermometer
The Type 3438 Transmitter Module consists
of an electric transmitter and a downstream
i/p converter to connect a Pt 100 sensor.
The resistance value of the Pt 100 sensor is
converted into a 4 to 20 mA current signal
in the electric transmitter. Its output signal (4
to 20 mA) is converted into a pneumatic sig-
nal between 0.2 and 1 bar by the i/p con-
verter. The output pressure, which is propor-
tional to the temperature, is supplied to the
bellows measuring system of the controlled
variable display and the controller module
as a pneumatic controlled variable signal
(controlled variable x).
5.2 Controller station
The actual value signal x causes a deflection
at the bellows measuring system of the ac-
tual value display (1.3) which is transmitted
to the pointer over a gear mechanism.
The set point (reference variable w) can be
adjusted at the scale (1.2) on the front. The
position of the set point adjuster (1.4) is
transmitted to the set point transmitter over a
gear mechanism. This pneumatic servo sys-
tem (1.41) converts the adjusted set point
into a pneumatic set point signal (w) which
is transmitted to the controller module.
The controller module compares the actual
value signal (x) with the set point signal (w)
and controls using the control signal yA de-
pending on the system deviation and the ad-
justed control parameters. The control signal
is connected to the signal pressure display
(1.5) and the output port y.
The controller station with manual/auto-
matic switchover (Figs. 2 and 4) additionally
features a manual/automatic switch (1.6),
an adjuster for manual mode (1.7), and a
differential pressure indicator (1.8).
Signal pressure display (1.5) and output
port y are connected to the automatic output
signal yAwith a switch position at “Auto-
matic” and to the manual output signal yH
set at the adjuster (1.7) with a switch posi-
tion at “Manual”.
A smooth switchover from manual to auto-
matic mode is possible when the differential
pressure indicator (1.8) shows that yAand
yHare identical.
12 EB 7030 EN
Principle of operation

EB 7030 EN 13
Principle of operation
Fig. 6 · Principle of operation of controllers
Type 3431 and 3432 for pneumatic standardized signals
1 Controller station
1.2 Scale
1.3 Actual value display with pointer,
gear mechanism and bellows
measuring system
1.4 Set point adjuster with pointer,
gear mechanism and set point (1.41),
set point display only for follower
controllers
1.5 Signal pressure display
2.7 Flapper
2.8 Nozzle
2.9 Restriction
3 Controller module
4 Type 6112 i/p Converter
Z = Supply pressure 1.4 bar
PA= Output pressure
PB= Compressed air network
Type 3432 with manual/automatic switch (1.6),
supply pressure regulator (1.9) and i/p converter
Type 3432 with Type 3435 Transmitter for Pressure Type 3432 with Type 3436 Transmitter for Temperature
1.8 Differential pressure indicator
for smooth manual/automatic
switchover
1.9 Supply pressure regulator
2 Transmitter module
2.1 Bourdon tube meas. system
2.2 Pneumatic servo system
2.3 Temperature sensor
2.4 Beam
2.6 Feedback bellows
1.5
yw
yww
Zx
1.2 1.4 1.3 3
PI
P
PPI
PID
/
PI
P
PPI
PID
/
PI
P
PPI
PID
/
w
1.8
yH
S
yH
yAxwx
wxwx
w
PB
Z
Z
y
y
Zy
x
x
1.21.41 1.4 1.3 3
R
w
z
yA
S
x
R
w
z
yA
S
x
R
w
z
yA
S
x
R
w
z
yA
S
x
PI
P
PPI
PID
/
1.6
1.5
1.7
4
1.9
1.5 31.2
2.2 2.3 2.9 2.8
1.4 1.31.41 1.5 31.2 1.4 1.31.41
2.1
1
1
1
1
2.7
2.4
2.6
2

5.3 Controller modules
The controller modules are designed as
plug-in units. They are inserted into the
self-sealing hose fittings of the controller sta-
tion and fastened in place by mounting
screw.
5.3.1 Type 3433 Controller
Modules
The controller modules consist of the com-
parator equipped with four metal bellows
arranged in a square and the base plate
with plug-in connections. The base plate
contains the components necessary for the
corresponding function such as relays and
restrictors. The components can be ex-
changed or retrofitted to upgrade a device
(refer to section 9.1 for more details).
Type 3433-2 PI Controller (Fig. 7, top)
The controlled variable x (actual value) and
the reference variable w (set point) are
transmitted as pneumatic signals between
0.2 and 1 bar to metal bellows w und x
over the turnboard A. When x is greater
than w, the actual value bellows tilts the
swashplate at its pivot towards the set point
bellows. This causes the pressure to rise
downstream of the nozzle which is con-
nected to the swashplate over a pin and, as
a result, the comparator increases the output
pressure yA. The output pressure is fed back
over turnboard Bto the bellows R2 on the
swashplate.
The pressure and the position of the
swashplate continue changing until the dis-
tance between the nozzle and flapper
achieve the initial value and the output pres-
sure yAreaches the value related to the con-
trolled variable x and the proportional-ac-
tion coefficient Kpset at the screw.
Outside of the controller module, yAis con-
nected to R, meaning that the output pres-
sure yAis also fed back to bellows R1 over
port R and the adjustable Tnrestriction. As a
result, the effect caused by the pressures in
bellows R1 and R2 is balanced and system
deviation is eliminated.
Should a switching pressure exist at port S
after switching the controller station to man-
ual mode, the Tnrestriction is bypassed by
the Tnstart-up relay.
Turnboard A determines the operating
action of the controller which can be
changed by turning the board. Refer to sec-
tion 2.1.1.
Turnboard B determines the air supply to
the feedback bellows.
In delivered state, it is set to yA, i.e., the
output pressure is directly fed back to bel-
lows R2, whereas, it is fed to bellows R1
over the manual control unit to port R. This
arrangement provides the controller with a
normal air supply and a damping of the out-
put pressure.
Setting it to Rresults in the output pressure
yAbeing fed back to bellows R1 and R2
over port R which provides a higher air sup-
ply.
This type of turnboard setting is suitable for
applications where the distance to the final
control element is long and the connected
volume is large as well as where controlled
systems react quickly. Refer to section 2.1.2
to set or change the air supply by turning
the turnboard B.
14 EB 7030 EN
Principle of operation

Type 3433-2 PI Controller Module
The following versions of the controller mod-
ules are similar in most aspects to the
Type 3433-2 PI Controller Module, how-
ever, they are fitted with, for example, an
operating point adjuster, derivative element,
or a selector switch, depending on the
application.
Type 3433-1 P Controller Module
corresponds to Type 3433-2.
An operating point adjuster is used in place
of the integral element.
Type 3433-3 PID Controller Module
corresponds to Type 3433-2.
Additionally, it contains a derivative element
which produces the rate action with approx-
imately ten times the gain in the input
branch of the controlled variable x. The rate
time can be adjusted at the TVrestriction.
EB 7030 EN 15
Principle of operation
Fig. 7 · Type 3433 Controller Modules
0.2
Kp
20
0.2
Kp
20
R Feedback
R1/R2 Feedback bellows
Z = Supply air 1.4 bar
YAOutput pressure
S Switching pressure
Turnboards
A Operating action
B Air supply
0.2
Kp
20

Type 3433-4 PD Controller Module
corresponds to Type 3433-1.
Additionally, it contains a derivative element
which produces the rate action with approx-
imately ten times the gain in the input
branch of the controlled variable x. The rate
time can be adjusted at the TVrestriction.
Type 3433-5 P/PI Controller Module
with P/PI selector switch can optionally be
used as a P controller with operating point
adjustment or as a PI controller.
The structure is the same as that of the PI
and P controller module.
Type 3433-6 PD/PID Controller Module
with PD/PID selector switch can optionally
be used as a PD or PID controller.
Type 3433-9 P Controller Module
with set point-dependent operating point
corresponds to Type 3433-1 P Controller
Module, except that the operating point
shifts proportional to the set point w.
16 EB 7030 EN
Principle of operation
Fig. 8 · Type 3433 Controller Modules
0.2
Kp
20
0.2
Kp
20
0.2
Kp
20

5.3.2 Type 3434 Controller
Modules
The controller modules have a round com-
parator which operates according to the
force-balance principle.
The proportional-action coefficient Kpcan
be adjusted in the range between 1 and 25.
Type 3434-2 PI Controller Module (Fig. 9)
Controlled variable x and reference variable
w are transmitted as pneumatic excess pres-
sures between 0.2 and 1 bar or 3 and
15 psi to the diaphragm chambers (R1 and
R2) over the turnboard A. When x is greater
than w, the force switch (23) lowers and the
plug opens. Supply air flows into the dia-
phragm chamber R2 and the output pres-
sure yAincreases. This pressure is transmit-
ted over the Tnrestriction (10) to the volume
of the 1:1 booster (24). Its output pressure is
fed back to the diaphragm chamber R1.
The effect caused by the pressures in the di-
aphragm chambers R1 and R2 is balanced.
The position of the force switch continues to
change until the controller output pressure
reaches a value which is related to the con-
trolled variable x and the adjusted propor-
tional-action coefficient Kp, i.e. until the sys-
tem deviation is eliminated.
The proportional-action coefficient Kpis ad-
justed at the restriction (9) and the reset time
Tnat the restriction (10). The zero point ad-
juster (8) is used to tune the device.
The turnboard Adetermines the controller’s
operating action which can be changed by
turning the board (section 2.1.1).
Type 3434-1 P Controller Module
The design and principle of operation are
the same in most aspects to Type 3434-2 PI
Controller Module.
However, a spring for an operating point
fixed at 0.6 bar is used instead of the feed-
back with Tnrestriction.
EB 7030 EN 17
Principle of operation
Fig. 9 · Type 3434-2 Controller Module
8 Zero point adjuster
9K
Padjuster
10 Tnadjuster
21 Diaphragms
23 Force switch
24 Booster
R1 Diaphragm chamber
R2 Diaphragm chamber
A Turnboard for operating
action
R
24
w
Z
y
A
K
p
T
n
S
A
x
9 8
R1
10
21
R2
23

5.4 Additional modules
5.4.1 Type 6112 i/p Converter
External reference variable wext and/or con-
trolled variable x can be issued as a current
signal of 4(0) to 20 mA or 1 to 5 mA and
converted by the i/p converter into a pneu-
matic standardized signal of 0.2 to 1 bar.
The i/p additional module with one or two
converters is integrated into the controller
station and can only be used in conjunction
with the Type 3433 Controller Modules.
5.4.2 wint/wext selector switch
When used as a combination of fixed set
point controller and follower controller, the
controller is fitted with a wint/wext selector
switch.
The associated set point adjuster and differ-
ential pressure indicator allow a smooth
switchover when the indicator is at zero. Re-
fer to section 3.3.
5.4.3 Supply pressure regulators
When a supply pressure regulator is
mounted onto the Type 3432 Controller Sta-
tion, it is suitable for the connection to an
operating pressure of 2.0 to 12 bar.
The Type 3708-5003 Supply Pressure Regu-
lator (Var.-ID 1023317) reduces and con-
trols the operating pressure to the required
supply pressure of 1.4 bar.
18 EB 7030 EN
Principle of operation
Fig. 10 · Additional modules
Connecting plate with two i/p converters
for controlled variable x and external set point
Supply pressure regulator
Adjuster for internal set point
wint/wext selector switch

5.4.4 Inductive limit switches
The inductive limit switches indicate when
the controlled variable x exceeds and/or
falls below an adjustable limit value.
Two metal tags are mounted to the pointer
shaft of the controlled variable x which acti-
vate associated proximity switches.
When the metal tag moves into the field of
the inductive pick-up, it is highly resistive
and when the metal tag moves outside of the
field, it is low resistive.
The proximity switches are located in adjust-
able brackets. The required switching point
can be adjusted by turning the brackets. Re-
fer to section 2.2 for more details.
EB 7030 EN 19
Principle of operation

6 Installation
6.1 Mounting
The controller station is designed for mount-
ing onto pipes, walls or in panels.
Refer to Figs. 11 and 12 for the correspond-
ing dimensions.
Pipe mounting
Mounting to vertical or horizontal 2" pipes
using a mounting part with bracket.
Required mounting kit:
Order no. 1400-6302.
Protective roof (accessories):
Order no. 1400-6311
20 EB 7030 EN
Installation
Fig. 11 · Installation dimensions of Type 3432 Controller Station
160
10
10
124
Ø7
28 13
16069 2845
40
13
228 8 228 8
241
29
26 27 8/938
26 27 8/938
536
192
30
31 30 30 16
Ø19.5
G¾
300
400
300
425
Ø12
Mounting plate
Pipe 2”
Process fluid connection
Cable gland M 20x1.5
Bracket
Air connections
Tapped ports ISO 228/1-G 1/8
Protective roof
Active sensor length
Air sensor
Type 3432 with Type 3436 Temperature Transmitter
Type 3432 with Type 3435 Pressure Transmitter
Ports:
26 x Controlled variable
27 wext Ext. set point
8/9 Supply air Z
38 y Manipulated variable