electronic proportional regulators news 49

electronic proportional regulators news 49
NEWS
49
COMPONENTS FOR PNEUMATIC AUTOMATION
521
FIVE TO ONE
ELECTRONIC PROPORTIONAL
REGULATORS
Air treatment
Proportional pressure regulator
1700 Series
CONTENTS:
REASONS FOR THE DEVELOPMENT
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Description
Field of application
PRODUCT PRESENTATION
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Product range
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Constructional principle
Functional diagram
Definitions
Functional
Constructional
Overall dimensions
Fixing possibilities
Installation/Operation
Product configuration
Operating parameters
Serial communication
FEATURES
CODING
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Coding key
Accessories
Con riserva di modifiche / Specifications may be subject to change without prior notice
1
1700 Series
Air treatment
Proportional pressure regulator
REASONS FOR THE DEVELOPMENT
Description
Modern industrial applications require increasingly high performances from their pneumatic components. For
example, the speed and thrust of a pneumatic cylinder, or the torque of a rotary actuator may need to be varied.
These parameters often need to be modified dynamically while an operation is running.
Traditional solutions based upon pneumatic valves supplied with different pressures often take up excessive
amounts of space. An alternative solution is a regulator that can vary pressure over time.
This type of regulator is known as an electronically controlled proportional regulator.
Three sizes have been designed, with flow rates of 7, 1,100 and 4,000 Nl/min.
Size “O” is specifically dedicated to those applications where the circuit air volume is small or for use as control
device for large size piloted pressure regulators.
Application fields.
Typical applications will include the necessity to dynamically control the force of an actuator, be it thrust or torque.
Examples include: Closing systems, painting systems, tensioning systems, packaging systems, pneumatic
braking systems, force control for welding grippers, thickness compensation systems, balancing systems, laser
cutting, pressure transducers for the control of modulating valves, test benches for system testing, force control for
buffers on polishers, etc.
2
Air treatment
Proportional pressure regulator
1700 Series
Product presentation
Product range
The supply and exhaust connections are on one side of the regulator and the working port is on the opposite side. The
two remaining sides carry G1/8 ports that are blanked off with removable plugs, these can be used to connect a
pressure gauge or as an outlet port.
The control solenoid valves, the pressure sensor, and the management electronics are placed in upper part of the
regulator.
The electronic management system is the same for all three sizes.
The new proportional regulator range has all the features that were only optional on the previous model.
When placing your order it is only necessary to specify the type of control signal, Voltage (T) or current (C), and the
pressure range required.
The new proportional regulator has these main features::
•
3 1/2 digit display
•
3-pushbutton keyboard
•
RS-232 serial port supplied as standard
•
voltage or current analog input
•
voltage analog output (values selected from keyboard)
•
current analog output (values selected from keyboard)
•
digital output
•
7 pressure values that are settable and selectable via 7 digital inputs
•
outlet pressure settable by value corresponding to the binary code of the logic statuses of 8 digital inputs
In addition to the wide range of optional features present on the previous model, we have added the ability to manage
the proportional regulator via digital input; all these functions are offered as standard on all versions of the regulator.
The three button keyboard provides easy access to view or change parameters (without the need to switch the
regulator off and on again).
The RS-232 serial connection permits the direct control of the regulator from a PLC or PC. It is possible to change
parameters, check status and also set the outlet pressure.
The range of all three analogue values: control signal, current analogue output and voltage analogue output, can be
selected using the appropriate parameters.
The 24 VDC digital output signal is protected against overloads and short circuits. It is possible to set the upper and
lower warning thresholds in a differentiated manner. The new proportional regulator can also be without using
analogue signals, by simply connecting PLC switches or outputs to the digital inputs of the regulator.
The supply voltage is 24 VDC. There are two operating modes that make use of digital inputs. The first assigns a
parameter to each digital input in which the desired output pressure has been stored. When the 24 VDC signal is
applied to an input the regulator sets the output pressure to the value stored in the corresponding parameter. The
second mode which uses digital inputs uses an 8 bit binary combination. To set the outlet pressure the value of the
pressure is calculated as a binary number and applied to the digital inputs with the same binary combination (supply
24 VDC to the reference pin).
This second operating mode is available only in voltage-controlled regulators.
SIZE 0
SIZE 1
SIZE 3
3
Air treatment
Proportional pressure regulator
1700 Series
FEATURES
Construction Principle
The Pneumax proportional regulator is based on a mechanical device with a balanced double shutter. One
shutter controls the orifice between the supply and operating connections, while the other shutter controls the
orifice between the operating and exhaust connections. The two shutters are controlled by a rod connected to a
diaphragm. The pressure in the diaphragm pilot chamber is governed by two off 2/2 10mm solenoid valves. One
valve is used to pressurise the chamber, the other to vent pressure away.
This control system allows the capacity of the valves to be controlled by varying the frequency at which the
switching voltage is applied.
The electronic part of the regulator comprises a 165-bit microprocessor with a 12-bit digital analogue converter
and a pressure transducer.
The incoming reference signal is analysed by the microprocessor, which in turn initiates switching of the
solenoid valves. At the same time, the pressure transducer sends the microprocessor an analogue signal of the
pressure value detected in the circuit downstream of the regulator. This signal is compared with the reference
signal and when the required value is reached the solenoid valves are no longer operated. If this equilibrium is
altered, either through a change in the output pressure value or a variation of the input reference signal the
microprocessor intervenes to restore the equilibrium.
If the value of the reference signal decreases, the venting solenoid valve is opened to decrease the pressure in
the pilot chamber, resulting in the opening of the of the exhaust path until the new equilibrium is achieved.
If the value of the reference signal increases, the pressurising solenoid valve is opened to increase the pressure
in the pilot chamber, resulting in the opening of the supply path until the new equilibrium is achieved.
Functional diagram
+24VDC
0 VDC
OUTPUT
MICROPROCESS.
E
EXH
IN
4
P
OUT
Air treatment
Proportional pressure regulator
1700 Series
FEATURES
CLOSED LOOP diagram (internal control circuit)
The proportional regulator is known as a CLOSED LOOP regulator because a pressure transducer in the circuit
transmits a continuous analog signal to the microprocessor, which compares the reference value with the
detected value and supplies the control solenoid valves accordingly.
REFERENCE SIGNAL
CONNECTOR
MICROPROCESSOR
SOLENOID VALVES
MANAGEMENT
TRANSDUCER
PRESSURE
MANAGEMENT IN
BALANCING CHAMBER
PRESSURE OUTP
REGULATOR OPERATING
PORT
5
1700 Series
Air treatment
Proportional pressure regulator
FEATURES
Definitions
This is a percentage value referring to the operating bottom scale that
defines the maximum deviation that is possible between the ideal curve and
the actual curve.
Example: As the linearity of the regulator is defined as being ±1% of the
bottom scale (FS) and the bottom scale is defined as 10 bar, maximum error
will be ±0.1 bar.
PRESSURE (bar)
Linearity
0
VOLTAGE(V)
This is the percentage value referring to the operating bottom scale that
defines the maximum deviation that is obtained on the outlet pressure with
the same reference value.
The friction is due to friction between the mechanical components that make
up the regulator and depends on whether the original values a smaller or
larger.
Example:
As the hysteresis of the regulator is ±0.5% of the bottom scale (FS) and the
bottom scale is 10 bar, maximum error will be ±0.05 bar.
PRESSURE (bar)
Hysteresis
0
VOLTAGE(V)
Repeatability
Ripetitibilità
Repeatability
2,1
Pressione
uscita ( bar
Outlet di
pressure
relativibar)
)
(relative
This is the percentage value referring to the operating bottom scale that
defines the maximum error detected during several readings taken
consecutively in the same operating conditions (this error is normally
generated by the hysteresis of the internal components).
Example:
As the hysteresis of the regulator is ±0.5% of the bottom scale (FS) and the
bottom scale is 10 bar, maximum error will be ±0.05 bar.
2,05
2
1,95
1,9
0
1
2
3
4
5
6
7
8
9
10
Cycles
Cicli
DV
0
6
Dp
Percentage value referring to the operating bottom scale that defines the
the minimum variation of the reference signal to which a variation in the
pressure value downstream corresponds.
Example:
As the regulator has sensitivity that is ±0.5% of the bottom scale (FS) and
the bottom scale is 10 bar, the pressure variation downstream will occur for
each variation in the reference signal above 0.05 Volt
PRESSURE (bar)
Sensivity
VOLTAGE(V)
Air treatment
Proportional pressure regulator
1700 Series
FEATURES
Fluid
Minimum inlet pressure
Maximum inlet pressure
Air filtered at 5 micron and dehumidified
Desired outlet pressure + 1 bar
10 bar
Order code
0009
0005
0001
Pressure value
0 ÷ 9 bar 0 ÷ 5 bar 0 ÷ 1 bar
Pneumatic
Outlet pressure
Size 0
Nominal flowrate from 1 to 2
(6 bar Δp 1 bar)
Discharge flowrate
(at 6 bar with 1 bar overpressure)
Air consumption
Supply connection
Operating connection
Exhaust connection
Maximum fitting tightening
Supply voltage
Standby current consumption
Current consumption with solenoid valves on
Voltage
Electric
Reference signal
1.100 Nl /min
4.000 Nl/min
7 Nl /min
1.300 Nl /min
4.500 Nl/min
< 1 Nl/min
M5
M5
ø1,8
3 Nm
< 1 Nl/min
G 1/4
G 1/4
G 1/8
15 Nm
< 1 Nl/min
G 1/2
G 1/2
G 3/8
15 Nm
24VDC ± 10% (stabilised with ripple <1%)
55 mA
145 mA
*0 ÷ 10 V
*0 ÷ 5 V
*1 ÷ 5 V
*4 ÷ 20 mA
*0 ÷ 20 mA
Voltage
10 KW
Current
250 W
Input impedance
Digital inputs
Digital outputs
Connector
*0 ÷ 10 V
*0 ÷ 5 V
*4 ÷ 20 mA
*0 ÷ 20 mA
24V DC ± 10%
24 V DC PNP (max. current 50 mA)
D-sub 15 poles
Linearity
Hysteresis
Repeatability
Sensitivity
Assembly position
Protection grade
Ambient temperature
< ± 0,3 % F.S.
<0,3 % F.S.
< ± 0,3 % F.S.
< ± 0,3 % F.S.
Indifferent
IP65 (with casing fitted)
-5° ÷ 50°C / 23° ÷ 122°F
Body
Shutters
Diaphragm
Seals
Cover for electrical part
Springs
Anodised aluminium
Brass with vulcanised NBR
Cloth-covered rubber
NBR
Technopolymer
AISI 302
Size 1
360 gr
Current analog output
Functional
Size 3
7 Nl /min
Current
Voltage analog output
Constructional
Size 1
Weight
Size 0
168 gr.
Size 3
850 gr
* Selectable by keyboard or by RS-232
7
Air treatment
Proportional pressure regulator
1700 Series
FEATURES
Overall dimension
8
M5
5
5
5
6
55
59
SIZE 0
26
M5 (*)
M4X8 (4 Threads)
3.8
3.8
45
* = External feedback input connection
(available only on the external feedback version)
M5
45
SIZE 1
G1/4"
M4X8 (4 Threads)
G1/8"
12
28.5
13.5
20
96
101
M5 (*)
26
45
G1/4"
* = External feedback input connection
(available only on the external feedback version)
45
SIZE 3
124
G3/8"
M4X8 (4 Threads )
16
18
27
41
128
M5 (*)
26
G1/2"
62
G1/2"
* = External feedback input connection
(available only on the external feedback version)
62
8
Air treatment
Proportional pressure regulator
1700 Series
FEATURES
Mounting options
16
34
18
77.4
In addition to mounting direcly using the M4 tappings on the body,
the 170M5 bracket may also be used, as show below:
70
R2.25
R2.25
16
26
9.5
110
80
70
R2.25
16
34
5
134
80
87
97
9
Air treatment
Proportional pressure regulator
1700 Series
FEATURES
Installation/Operation
PNEUMATIC CONNECTION
The compressed air is connected by means of M5 threaded holes (for size 0 regulator), G ¼” threaded
holes (for size 1 regulators) and G ½” threaded holes (for size 3 regulators) on the body.
Before making the connections, eliminate any impurities in the connecting pipes to prevent chippings
or dust entering the unit. Do not supply the circuit with more than 10 bar pressure and make sure that
the compressed air is dried (excessive condensate could cause the appliance to malfunction) and
filtered at 5 micron. The supply pressure to the regulator must always be at least 1 bar greater than the
desired outlet pressure.
If a silencer is applied to the discharge path the unit’s response time may change; periodically check
that the silencer is not blocked and replace it if necessary.
ELECTRICAL CONNECTION
For the electrical connection a SUB-D 15-pole female connector is used (to be ordered separately).
Wire in accordance with the wiring diagram shown below.
Warning: INCORRECT CONNECTIONS MAY DAMAGE THE DEVICE
NOTES ON OPERATION
If the electric supply is interrupted, the outlet pressure is maintained at the set value. However,
maintaining the exact value cannot be ensured as it is impossible to operate the solenoid valves.
In order to discharge the circuit downstream, zero the reference, make sure that the display shows a
pressure value equal to zero and then disconnect the electric power supply.
A version of the device is available that exhausts the downstream circuit when the power supply is
removed. (Option “A” at the end of the ordering code).
If the compressed-air supply is suspended and the electric power supply is maintained a whirring will
be heard that is due to the solenoid valves; an operating parameter can be activated (P18) that
triggers the regulator protection whenever the requested pressure is not reached within 4 seconds of
the reference signal being sent. In this case the system will intervene to interrupt the control of the
solenoid valves. Every twenty seconds, the unit will start the reset procedure until standard operating
conditions have been restored.
TOP VIEW
OF THE REGULATOR
CONNECTOR
1
8
9
15
CONNECTOR PIN:
1 = DIGITAL INPUT 1
2 = DIGITAL INPUT 2
3 = DIGITAL INPUT 3
4 = DIGITAL INPUT 4
5 = DIGITAL INPUT 5
6 = DIGITAL INPUT 6
7 = DIGITAL INPUT 7
8 = ANALOG INPUT / DIGITAL INPUT
9 = SUPPLY (24 VDC)
10 = DIGITAL OUTPUT (24 VDC PNP)
11 = ANALOG OUTPUT (CURRENT)
12 = ANALOG OUTPUT (VOLTAGE)
13 = Rx RS-232
14 = Tx RS-232
15 = GND
10
Air treatment
Proportional pressure regulator
1700 Series
FEATURES
Display features
The proportional regulator has a 3 1/2 digit display and a three-pushbutton touchpad by
means of which information on regulator status can be displayed and the functional and
operating parameters can be set.
Using the display in “standard” mode
When the regulator is switched on, the display shows the outlet pressure value detected
by the internal transducer. This value can be displayed in 3 different measuring units (Bar
- PSI - MPa) that can be selected by the user.
If the right-hand key (▲) is pressed during normal operation of the regulator, the desired pressure value appears.
This value is expressed in the unit of measurement that has been set by the user. As the pressure regulator has 5
different modes for managing the reference signal, if during normal operation the left-hand key (◄) is kept pressed
the display will show a letter and a number alternately. The letter indicates the reference source that the regulator is
using whilst the number indicates the reference value
Display letter
Meaning
Value
Analog input
Volt/mA
RS-232
Bar hundredths(e.g. 122)
Keyboard
Bar (e.g. 1.22)
Digital input
0 to 7
Binary input(1)
0 to 255
Levels set by
0 to 7
binary codification
(1) N.B. This option is available only for regulators with voltage analog input (letter T in seventh digit of
order code).
Setting desired pressure value from display
If the regulator is configured to use the keyboard of the display as the reference source, press the central key (SET)
for 2 seconds to set the desired pressure directly. In particular, the display shows the currently set pressure value,
with the last digit on the right flashing (modifiable digit).
Press the right-hand key (▲) to increase the value of the flashing digit and press the left-hand key (◄) to move to
the following digit. Repeat the operation for all the characters (the selected character will be recognisable by the
flashing). Once the desired value has been set, press key (SET) to save it permanently to the memory.
If the entered value is acceptable (it belongs to the preset use range and is not in conflict with the value of other
parameters), the display confirms that the value has been entered by flashing twice (it switches off and lights up
again twice to indicate the set value).
If the entered value is not acceptable (outside limits set by manufacturer or in conflict with other parameters) the
display shows an error signal.
If the entered value is less than the lower limit the message ELo appears and the device proposes the minimum
permitted value.
If the entered value is greater than the upper limit the message EHi appears and the device proposes the
maximum permitted value.
11
1700 Series
Air treatment
Proportional pressure regulator
FEATURES
Using the display in “modify parameters” mode
To enter “modify parameters” mode, press the left-hand (◄) and right-hand (▲ ) keys simultaneously for 2
seconds.
If the password is not enabled, the user accesses the first parameter directly. If the password is enabled the
message PSv appears on the display followed by the request to enter the value of the password:
To enter the value of the password, proceed in this manner: press the right-hand key (▲ ) to increase the value of
the flashing digit and then press the left-hand key (◄) to move to the next digit. Repeat the operation for all the
characters (the selected character flashes).
N.B.: the fourth character can have only the values 0 and 1. 0 is displayed when the point at the bottom on the left is
switched on:
Once the desired value has been set, press the key (SET). If this is correct, you will enter the parameter
configuration menu directly. If the password has not been entered correctly the message EEE will appear on the
display and it will not be possible to access the parameter configuration menu. The device will thus return to
“standard” mode.
Defining parameters
The proportional regulator can be fully customised to meet the needs of the end user.
In particular, the device associates with its operating configuration variable details that can be accessed directly
via the display or RS-232 serial port. These are from now on defined as PARAMETERS.
By varying the parameters it is possible to intervene on the following regulator features:
insensitivity
unit of measurement of the pressure displayed on the display
pressure values corresponding to the minimum and maximum value of the analog signal
defining the range of the outlet analog signal
defining the intervention thresholds of the digital output
Choosing the reference source
setting the pressures corresponding to the digital inputs
activating the protection for the solenoid valves
enabling password and corresponding value
speed of convergence on the desired pressure.
12
Air treatment
Proportional pressure regulator
1700 Series
Modifying parameters
Once the user has entered the parameters configuration menu (with the previously described procedure), the
display is as follows:
P identifies the parameter selection mode whilst the number displayed on the right indicates the parameter
number.
Press the right-hand key (▲) to change the parameter number from (P0) to (P22). Each time the key is pressed the
number increases by 1; if the key is kept pressed the parameter number increases automatically.
Once you have identified the parameter that you wish to display or modify, press the key (SET) to access it.
After the key (SET) has been pressed the display shows the current value of the selected parameter and enables it
to be modified. Depending on the type of parameter, 1 or more characters may be displayed.
The procedure for modifying the values is the same as for entering the password: it is possible to modify just one
character at a time (the flashing character) by pressing the right-hand key (▲). On the other hand, if the left-hand
key (◄) is pressed, the active character is changed (for those parameters that have more than one character).
Once the value to be assigned to the parameter has been set, press the key (SET) to confirm the selection made.
If the entered value is acceptable (it belongs to the preset use range and is not in conflict with the value of other
parameters) the display confirms that the value has been entered by flashing twice (it switches off and switches on
again twice to indicate the set value). A parameter that has been modified in this way is said to have been
CONFIRMED.
When flashing stops the regulator returns to the parameter selection (it again displays the message “P X”, X being
the last parameter to have been modified).
If the entered value is not acceptable (outside the limits set by the manufacturer or in conflict with other
parameters) the display shows an error message.
If the entered value is less than the lower limit the message ELo appears and the device proposes the minimum
permitted value.
If the entered value is greater than the upper limit the message EHi appears and the device proposes the
maximum permitted value.
N.B.: the proposed values are not automatically confirmed. To confirm, press the key (SET).
By proceeding in this way (parameter selection, subsequent modification and confirmation) it is possible to modify
the value of all the parameters.
Once all the values have been modified, in order to enable all the modified values to be saved and to return to the
standard operating mode, press the right-hand (▲) and left-hand (◄) keys simultaneously for about two seconds.
The regulator confirms the change of operating mode by showing this symbol on the display for about half a
second.
Warning
 Whilst the regulator is in “modify parameters” mode outlet pressure is not adjusted, so it cannot be
guaranteed that desired pressure corresponds to the outlet pressure.
Whilst the regulator is in “modify parameters” mode RS-232 communication is disabled.
Press the two keys (◄) (▲) to leave “modify parameters” mode:
all the CONFIRMED parameters are saved to the permanent memory and are thus maintained even
after switch-off.
Analogue and digital output are not updated therefore it is not possible to ensure they are correct;
 In order to leave “modify parameters” mode without saving any modified parameter (not even
confirmed parameters) wait for two minutes to elapse without pressing any key. Alternatively, switch off
the regulator and switch it on again.
 If the regulator is switched off whilst it is in “modify parameters” mode no modified parameter is
saved to the permanent memory even if it has already been confirmed.
13
Air treatment
Proportional pressure regulator
1700 Series
List of parameters
PARAMETER 0
Desired pressure from keyboard
Defines the desired regulator outlet pressure value
Default value
0
Unit of measurement
Bar
Range
From minimum pressure (P3) to maximum pressure (P4)
Warning: This parameter becomes active only if the parameter (P10) is set at 2.
Minimum pressure (P3) and maximum pressure (P4) are the operating range. If these values are
subsequently modified and the desired pressure value is outside this new range, the device will set the
desired pressure (P0) automatically at the nearest permitted value
PARAMETER 1
Insensitivity
Defines the minimum deviation between desired pressure and outlet pressure beyond which the regulator
intervenes.
Default value
Unit of measurement
0.03
Bar
Range
From 0.02 to 0.20 with Parameter 22 at 0 - 1 - 2
From 0.01 to 0.20 with Parameter 22 at 3
If the difference between outlet pressure and desired pressure exceeds or falls below the (P1) parameter value the
regulator intervenes to increase or decrease the outlet pressure until the set value is reached.
Warning: the smaller the set insensitivity value, the smaller the tolerated deviation will be. In this way,
the regulator intervenes much more frequently to control the solenoid valves, generating small
variations in outlet pressure.
PARAMETER 2
Display unit of measurement
Defines the unit of measurement that will be used on the display to show outlet pressure and desired pressure
during operation in “standard” mode.
Default value
0
Unit of measurement
/
Value
0
1
2
Range
From 0 to 2
Displayed value
0.00
000
00.0
Meaning
Bar
PSI
MPa
Warning: All the other parameters linked to pressure (P0), (P1), (P3), (P4), (P8), (P9), from (P11) to
(P17) are measured in bar.
PARAMETER 3
Minimum pressure
Defines the (minimum) outlet pressure value corresponding to the minimum value of the reference signal. The
range varies according to the model of transducer used.
Minimum pressure must be at least 1 bar less than maximum pressure
Product code
17#E2N.#D.0009.#
17#E2N.#D.0005.#
17#E2N.#D.0001.#
PARAMETER 4
Default value
0.00
0.00
0.00
Unit of measurement
Bar
Bar
Bar
Range
From 0.00 to 8.90
From 0.00 to 4.90
0.90
Maximum pressure
Defines the (maximum) outlet pressure value corresponding to the maximum value of the reference signal.
The default value and the range vary according to the model of transducer used.
Maximum pressure must be at least 1 bar greater than minimum pressure
Product code
17#E2N.#D.0009.#
17#E2N.#D.0005.#
17#E2N.#D.0001.#
14
Default value
9.00
5.00
1.00
Unit of measurement
Bar
Bar
Bar
Range
From 0.10 to 9.00
From 0.10 to 5.00
From 0.10 to 1.00
Air treatment
Proportional pressure regulator
PARAMETER 5
1700 Series
Selecting analog input value
Defines the range of the analogue input signal managed by the proportional regulator (pin 8 of the 15-pole connector
Default value
0
Unit of measurement
/
Range
From 0 to 3
The meaning of the parameter changes according to the model's type of analogue reference. The model can easily
be identified by the letter T or C of the order code, and indicates that the analogue reference is a voltage (T) or current
(C) controlled signal.
C Current
Valore
T Voltage
4-20 mA
0
0-10 V
0-20 mA
1
0-5 V
0-20 mA
2
1-5 V
User set
3
User set
PARAMETER 6
Voltage analog output
Defines the range of the voltage analogue output (pin 12 of the 15-pole connector). The two limits of the range are the
value of the voltage-controlled analogue output corresponding to minimum and maximum outlet pressure. The
output will assume all intermediate values in proportion to the outlet pressure.
Default value
0
Unit of measurement
/
Value
0
1
2
3
PARAMETER 7
Range
From 0 to 3
Meaning
0-10 V (9 V at 9 bar)
0-5 V (4.5 V at 9 bar)
0-10 V (10 V at 9 bar)
1-5 V (5 V at 9 bar)
Current analog output
Defines the range of the current analogue output (pin 11 of the 15-pole connector). The two limits of the range are
the value of the current-controlled analogue output corresponding to minimum and maximum outlet pressure. The
output will assume all intermediate values in proportion to the outlet pressure.
Default value
0
Unit of measurement
/
Value
0
1
PARAMETER 8
Range
From 0 to 1
Meaning
4-20 mA
0-20 mA
Lower threshold for digital output
The digital output provides an indication that the outlet pressure corresponds to the desired pressure. It is activated
when outlet pressure falls within a range defined by a lower threshold and an upper threshold, both of which can be
modified by the user.
The digital output is active if the outlet pressure is greater than the desired pressure less the lower threshold and is
less than the desired pressure plus the upper threshold.
Example: Desired pressure: 3 bar, lower threshold: 0.5 bar, upper threshold: 0.8 bar
The digital output is active if the outlet pressure is between 2.5 bar (3 - 0.5) and 3.8 bar. (3 + 0.8) (pin 10 of the 15-pole
connector)
Default value
0.50
PARAMETER 9
Unit of measurement
Bar
Range
From 0.10 to 1.00
Upper threshold for digital output
See description of parameter (P8) (pin 10 of the 15-pole connector)
Default value
0.50
Unit of measurement
Bar
Range
From 0.10 to 1.00
15
Air treatment
Proportional pressure regulator
1700 Series
PARAMETER 10
Reference source
Defines the reference source that the regulator has to use to set outlet pressure. Option 4 is available only for voltagecontrolled regulators (letter T in seventh digit of order code).
Default value
0
Unit of measurement
/
Range
From 0 to 5
Meaning
Analogue input
RS-232
Keyboard
Digital-level inputs
Binary-code inputs
Digital-level inputs with Binary code
Value
0
1
2
3
4
5
0 The regulator sets outlet pressure using the analogue signal (voltage or current) coming from the 15-pole supply
connector at pin 8.
1 The regulator sets outlet pressure using the command coming from the serial port RS-232
2 The regulator sets outlet pressure directly from the keyboard. The parameter (P0) is used to set pressure.
3 The regulator sets outlet pressure via the digital inputs (pin from 1 to 7 of the 15-pole connector). Each of the 7 inputs
is
matched by a parameter (e.g. Input 1 Parameter P11 - Input 2 Parameter P12 etc.). By default, all the parameters from
P11 to P17 are set at 0, if input 3 is activated (+24 VDC) and parameter P13 is 0, outlet pressure will be set at 0. If 2 or
more inputs are simultaneously active, the outlet pressure will correspond to that of the input with a lower number.
E.g. If input 2 and input 5 are active, outlet pressure will be that set by parameter P12
4 The regulator sets outlet pressure via the binary code from 0 to 255 consisting of the logic status of the digital inputs (pin
from 1 to 8 of the 15-pole connector) Pin 8 of the connector thus has a dual function: it can be used as an analogue input
(e.g. 0-10V) or as a digital input (most significant digit of the binary code).
Warning: this option is available for regulators with voltage analogue inputs (letter “T” in seventh digit of order
code).
- Verify and ensure that to pin n.8 has been connected only the analogue signal or the digital signal
5 Value 5 has been added as an alternative to value 3. When value 3 is selected up to 7 command signals are needed,
which correspond to the 7 parameters (P11 - P17). When value 5 is selected only 3 electric signals are needed, because
there is correspondence between Parameters P11 - P17 and the binary coding consisting of the logic state of the signals.
The regulator sets outlet pressure via the binary coding from 0 to 7 consisting of the logic state of the first digital inputs
(pin from 1 to 3 of the 15 pole connector). Combination 0 corresponds to 10 bar pressure.
Pin n. 1
0
1
0
1
0
1
0
1
Pin n. 2
0
0
1
1
0
0
1
1
Pin n. 3
0
0
0
0
1
1
1
1
Desidered pressure
0 bar
Parameter P11
Parameter P12
Parameter P13
Parameter P14
Parameter P15
Parameter P16
Parameter P17
Method for calculating status of inputs
This formula is used to calculate the binary number to be coded with the logic status of the inputs:
255 x
(
Desired pressure - Minimum pressure
Maximum pressure - Minimum pressure
)
E.g.: maximum pressure= 5.25 bar; minimum pressure= 3.46 bar; desired pressure= 4.12 bar
Decimal number = 255 x (4.12 - 3.46) / (5.25 - 3.46) = 94
The decimal number then has to be converted into a binary number: 94(decimal) = 01011110(binary)
The status of the 8 inputs must thus be as follows:
Input number
8
7
6
5
4
3
2
1
Logic status
0
1
0
1
1
1
1
0
128
64
32
16
8
4
2
1
Decimal equivalent
In this case the user thus has to raise inputs 2,3,4,5, 7 and has to lower inputs 1,6 and 8
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Air treatment
Proportional pressure regulator
1700 Series
PARAMETER 11 to 17
Define the regulator outlet pressure desired when the corresponding input is active (pin from 1 to 7 of the 15-pole
connector)
Default value
0.00
Unit of measurement
Bar
1
8
9
15
CONNECTOR PIN:
1 = INPUT 1
2 = INPUT 2
3 = INPUT 3
4 = INPUT 4
5 = INPUT 5
6 = INPUT 6
7 = INPUT 7
Range
From minimum pressure (P3) to maximum pressure (P4)
Input
1
2
3
4
5
6
7
Parameter
11
12
13
14
15
16
17
Warning: These parameters become active only if the parameter (P10) is set at 3 (reference source
via digital-level inputs).
Minimum pressure (P3) and maximum pressure (P4) are the operating range. If this range is
subsequently modified and some pressure values assigned to a level are outside this new range the
device will automatically set the pressure at the nearest permitted value.
PARAMETER 18
Protection mode
If during operation in “standard” mode the desired pressure cannot be reached (for example, there is no
compressed-air supply or it is insufficient) or the discharge conduit is blocked or closed, the regulator continues to
work on the solenoid valves to try to reach the desired pressure. This parameter allows the automatic switch-off of
the control solenoid valves for up to 20 seconds to be enabled.
This function is used to safeguard the solenoid valves over time.
The protection is triggered if the desired pressure is not reached and the outlet pressure does not undergo
significant variations within a 4-second control of the solenoid valves.
A significant variation is defined as a variation that is greater than the defined insensitivity value, parameter P1.
After the 4 seconds have elapsed in which the regulator attempts to reach the desired pressure, the protection is
triggered. This protection switches off the solenoid valves for a maximum of 20 seconds.
If the 20 seconds have elapsed or if during the 20 seconds during which the solenoid valves are switched off the
required pressure (reference) varies or the outlet pressure varies the regulator will again start to control the
solenoid valves for another 4 seconds, trying to reach the desired pressure.
If this does not occur, the protection is reactivated.
From this point on 4 seconds of controlling the solenoid valves and 20 seconds of switch-off alternate cyclically.
When the protection is activated, the message P18 appears on the display alternating with the messages EHi or
ELo indicating that the regulator is not reaching the desired pressure due to filling (ELo lack of air) or pressure
discharge difficulties (EHi discharge conduit blocked).
Default value
0
Unit of measurement
/
Value
0
1
Range
From 0 to 1
Meaning
Deactivated
Activated
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Air treatment
Proportional pressure regulator
1700 Series
PARAMETER 19
Enabling password request
Set this parameter at 1 to enable the password request: this will be requested whenever an attempt is made to
access “modify parameters” mode.
Default value
0
Unit of measurement
/
Value
0
1
Range
From 0 to 1
Meaning
Password deactivated
Password activated
By setting this parameter to 1 the protective password will be switched on, the password will be requested every
time that the user will try to access the “SET UP” menue.
Attention: before enabling the password verify and , if necessary, modify parameter P20
PARAMETER 20
Password value
This parameter is the password. If the password request (parameter P19) is enabled, this value must be entered
whenever an attempt is made to access “modify parameters” mode.
N.B.: the fourth character can have only the values 0 and 1.
0 is displayed when the point at the bottom on the left is switched on:
Default value
000
PARAMETER 21
Unit of measurement
/
Range
From 000 to 1999
Default value
Restores all user configuration parameters to default values.
In order to activate the command that restores parameters to values set by manufacturer, enter the
value “333” on the display and confirm the entry.
Warning: all changes made previously will be lost (except for parameters P19 and P20)
PARAMETER 22
Intervention mode
Defines the mode for converging on the desired pressure that the regulator should use
Default value
0
Value
0
1
2
3
4
Unit of measurement
/
Meaning
Standard mode
Efficient mode
Accurate mode
Sensitive mode
Fast mode*
Range
From 0 to 4
*Fast mode was specifically designed
for size 0 regulators, in order to have the
maximum speed in filling the circuit.
We suggest to use this mode only with
size 0 regulators.
Every intervention mode characterises in a particular way the proportional regulator behaviour.
In particular:
- Standard mode is trade-off between speed and accuracy.
- Efficient mode controls solenoid valves to allow a bigger change of outlet pressure. This grants
A lower time to fill / empty a volume. It is a specially suitable if there is a big volume to manage or if
The inlet airflow is low. As a result of the high fill/empty speed the desired pressure can
occasionally be exceeded for a short time.
- Accurate mode controls solenoid valves to manage outlet pressure more softly. It is particularly
Suitable if there is a little volume to manage or if the inlet airflow is high. This mode is slower than others.
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Proportional pressure regulator
1700 Series
- Sensitive mode tracks the desired pressure with more frequent changes. It is particularly suitable if a
constant outlet pressure is required when the downstream pressure varies due to the application (e.g. working
with an inconsistent flow rerquirement).

N.B. Each mode may be better suited to an application than the others. The parameters to consider
are: Inlet airflow, the volume to be managed, speed and accuracy. We suggest testing each mode on
an application to establish which is the most suitable.
PARAMETER 23
Reference value of minimum pressure
Defines the analogue signal corresponding to minimum pressure.
Attention: Used only when Parameter 5 is set at 3
Default value
Unit of
measurement
Range
0
0
V
mA
From 0 to 9 for voltage control
From 0 to 19.9 for current control
PARAMETER 24
Reference value of maximum pressure
Defines the value of the analogue signal corresponding to maximum pressure.
Attention: Used only when Parameters 5 is set at 3
Default value
Unit of
measurement
Range
9
0.9
V
mA
From 1 to 10 for voltage control
From 0.1 to 20 for current control
PARAMETER 25
Linear progression time
Inserts a linear progression during the transition between two outlet pressures when the digital
inputs state changes. This value represents the time occurred to make this change.
Attention: Used only with Parameter 10 set at 3 or at 5
Attention: To activate this time it’s needed to activate digital input 8.
Default value
1
Unit of
measurement
100ms
Range
From 1 to 100 (From 0.1 to 10 seconds)
AUTOMATIC RESOLUTION OF POSSIBLE CONFLICTS BETWEEN SET PARAMETERS
The regulator does not permit desired pressures - parameters (P0), (P11), (P12), (P13), (P14), (P15), (P16),
(P17) and the desired serial pressure to be set outside the operating range (pressure range) defined by the
parameters (P3) and (P4).
Warning: make sure that the parameters (P3) and (P4) have been entered correctly as the
regulator will automatically modify any desired pressure that is outside the operating range.
The value assigned will correspond to the nearest permitted value
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Proportional pressure regulator
1700 Series
RS-232 serial communication
General description
All models of the proportional regulator feature the RS-232 serial port that enables a direct connection between the
regulator and a computer or a PLC (provided with a serial port) to be established.
The regulator has a set of commands that enable all the previously described parameters to be read and modified
(except for parameters P0, P19, P20 and P21).
In addition to this, serial communication can be used to send a reset command to the regulator, read and set the
desired pressure and read the outlet pressure
Warning: to use the serial port as a reference, set parameter P10 at 1
When the proportional regulator is in “standard” mode it is in receiving status: it does not send any message
independently because it is waiting for a command to arrive. As soon as the regulator receives a message on the
RS-232 port this message is decoded, the required command is run and a reply is sent.
Warning: “modify parameters” mode disables the RS-232 communication
How to set the serial port
The following set of communication parameters must be used for the RS-232 transmission:
Baud Rate:
Parity:
Data bit :
Stop bit :
4,8 Kb
none
8
1
Communication protocol
The communication protocol Pneumax uses only hexadecimal notation.
N.B.: all the numbers used in this section are hexadecimally coded.
In order to indicate that this notation is being used the suffix (h) will be added to all the numbers.

In order to interact with the proportional regulator, commands defined by the parent company must be sent.
The command has this structure:
LE OC PP D1 D2
Key:
LE (always sent) = length of message: number of bytes sent, including LE
OC (always sent)= operating code: defines the operation that the regulator has to perform
PP (not always sent)= parameter: defines which parameter is read or written
D1-D2 (not always sent)= Data : define the value of the parameter

N.B.: the regulator always sends a reply to each command.
The structure of the reply is the same as the command, with the sole difference that the proportional
regulator adds 80(h) to the corresponding operating code to indicate that the command has been
understood.
Operating codes
The following table indicates the managed operating codes
Operating code
01(h)
0D(h)
61(h)
21(h)
22(h)
2F(h)
3F(h)
4F(h)
20
Operation
Reset
Reading a parameter
Writing a parameter
Writing the desired pressure (hundredths of a bar)
Setting the desired pressure (hundredths of bar)
Reading desired pressure (hundredths of a bar)
Reading outlet pressure value (hundredths of a bar)
Desired pressure and reference source reading
Air treatment
Proportional pressure regulator
1700 Series
Commands list
After declaring all the operating codes, in order to create a command it is sufficient to structure the sent packet
according to the rules defined previously (just include the length of the packet, choose the action to perform on a
particular parameter and choose the parameter).
There follows the complete list of the messages managed by the regulator with the corresponding replies.
Note that, as mentioned previously, the operating code of the reply is the same as that of the command with the
addition of 80(h)
Operation
From PLC to regulator
Reply of regulator
Reset
02(h) 01(h)
02(h) 81(h)
Reading parameter
03(h) 0D(h) PP(h)
05(h) 8D(h) PP(h) NN(h) NN(h)
Writing parameter
05(h) 61(h) PP(h) NN(h) NN(h)
05(h) E1(h) PP(h) NN(h) NN(h)
Writing desired pressure
04(h) 21(h) NN(h) NN(h)
04(h) A1(h) NN(h) NN(h)
Setting desired pressure
04(h) 22(h) DD(h) DD(h)
04(h) A2(h) DD(h) DD(h)
Reading desired pressure
02(h) 2F(h)
04(h) AF(h) NN(h) NN(h)
Reading outlet pressure
02(h) 3F(h)
04(h) BF(h) NN(h) NN(h)
Desired pressure and
reference source reading
02(h) 4F(h)
05(h) CF(h) RR(h) VV(h) VV(h)
Key:
PP
NN NN
RR
DD DD
VV VV
= parameter number - from 0(h) to 16(h)
= parameter contents
= reference source (Parameter P10)
= desired pressure
= reference value
When the regulator receives a correct writing command the contents of the NN NN parameter is saved
automatically to the permanent memory (EEPROM).
Warning: the manufacturer of the microcontroller declares that in extremely critical operating conditions
the number of writings guaranteed in EEPROM for the technical features of your product is equal to
100.000. When constant changes in pressure are required, it is possible to use command 22(h), which
sets the desired pressure but does not write it in the EEPROM.
The parameters are the same as those defined in the previous pages, see the section “List of Parameters” for
explanations of their contents, default values, ranges etc..

N.B.: the Reset command (operating code 01) is the equivalent of the regulator hardware switching off.
Warning: the reading and writing value of the pressure is always expressed in hundredths of a bar (in
hexadecimal notation).
Example 1: Writing desired pressure
Regulator outlet pressure of 4.25 bar is desired. The command to be sent to the regulator must be:
4,25 bar = 425 hundredths of a bar = 01A9(h)
Command
Reply
= 04(h) 21(h)
01(h) A9(h)
= 04(h) A1(h) ( 21(h) + 80(h) ) 01(h) A9(h)
Example 2: Writing desired pressure
Let it be assumed, for example, that outlet pressure from the regulator is 6.35 bar.
The command for reading its value must be:
Command
= 02(h) 3F(h)
Reply
= 04(h) BF(h) ( 3F(h) + 80(h) ) 02(h) 7B(h)
027B(h) = 635 hundredths of a bar = 6,35 bar
Warning: Minimum pressure (P3) and maximum pressure (P4) are the operating range. If these values
are subsequently modified and the desired pressure value is outside this new range, the device will set
the desired pressure automatically at the nearest permitted value.
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Proportional pressure regulator
1700 Series
Error messages
If the regulator receives a command that it recognises and which does not contain errors it responds with a
message in which the operating code is increased by 80(h).
If, on the other hand, the regulator receives a command that it does not recognise or which contains errors, it
responds with a message in this form:
03 94 EC
Key:
03 = Length of message
94 = Operating code of error message.
EC = Error message code
Error code (EC)
Description
01
Regulator in “modify parameters” mode: command ignored
02
Operating code unknown
03
Value outside range
04
Limit value in conflict with reference
05
Maximum pressure and minimum pressure in conflict
07
Parameter inexistent
N.B.: controls for entering parameters from keyboard are also implemented for serial communication; if,
for example, an attempt is made to write a minimum pressure value that is greater than the maximum
pressure value, a message will be received in response containing the relative error code (05).
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Proportional pressure regulator
1700 Series
ORDER CODES
Code structure
17_E2N. _ . D . ____ . _
VARIANT :
= Standard version
E
= External pressure feedback
A
= Exhaust downstream pressure
when power supply is removed
PRESSURE RANGE :
0001= Range 0 - 1 bar
0005= Range 0 - 5 bar
0009= Range 0 - 9 bar
MANAGEMENT :
C= Current signal (4-20 mA / 0-20 mA)
T= Voltage signal (0-10 V / 0-5 V / 1-5 V)
SIZE :
0= Size 0
1= Size 1
3= Size 3
Electric connectors order code
5300.F15. _ . _
VARIANTS :
00= Only connector + casing IP65
03= Connector + cable, 3 metres
05= Connector + cable, 5 metres
VERSION :
00= straight
90= output 90°
Order code: fixing bracket
170M5
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1700 Series
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Air treatment
Proportional pressure regulator
S.p.A.
24050 LURANO (BG) - Italy
Via Cascina Barbellina, 10
Tel. 035/4192777
Fax 035/4192740
035/4192741
http://www.pneumaxspa.com
pneumax@pneumaxspa.com
D. NW. 49/GB - 12/2008
PRINTED IN ITALY - 02/2010
A
S.p.A.
LURANO (BG) - ITALY
Certified
Quality System
ISO 9001:2008
ISO 14001:2004
OHSAS 18001:2007
Reg. No. 10677
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