IFM PN78 Series User manual

Operating instructions
Pressure sensor
PN78xx
PY7809
704788 / 00 0 / 2020
UK

2
Contents
1 Preliminary note���������������������������������������������������������������������������������������������������3
1�1 Symbols used ������������������������������������������������������������������������������������������������3
2 Safety instructions �����������������������������������������������������������������������������������������������4
3 Functions and features ����������������������������������������������������������������������������������������5
4 Function���������������������������������������������������������������������������������������������������������������6
4�1 Processing of the measured signals��������������������������������������������������������������6
4�2 Switching function������������������������������������������������������������������������������������������6
4�3 Diagnostic function ����������������������������������������������������������������������������������������7
4�4 Differential pressure measurement����������������������������������������������������������������7
5 Mounting��������������������������������������������������������������������������������������������������������������8
5�1 Mounting accessories������������������������������������������������������������������������������������8
5�2 Pressure connections for differential pressure
measurement�������������������������������������������������������������������������������������������������8
5�3 DIN rail mounting�������������������������������������������������������������������������������������������9
5�4 Rear panel mounting �������������������������������������������������������������������������������������9
5�5 Mounting on a pressure-carrying rear panel������������������������������������������������10
5�6 Floor mounting��������������������������������������������������������������������������������������������� 11
5�7 Mounting on a maintenance unit �����������������������������������������������������������������12
6 Electrical connection������������������������������������������������������������������������������������������13
7 Operating and display elements ������������������������������������������������������������������������14
8 Menu������������������������������������������������������������������������������������������������������������������15
8�1 Menu structure���������������������������������������������������������������������������������������������15
8�2 Explanation of the menu������������������������������������������������������������������������������16
9 Parameter setting ����������������������������������������������������������������������������������������������17
9�1 General parameter setting���������������������������������������������������������������������������17
9�2 Setting of the output signals ������������������������������������������������������������������������19
9�2�1 Setting of the unit of measurement for system pressure ��������������������19
9�2�2 Setting of the output function��������������������������������������������������������������19
9�2�3 Setting of the switching limits �������������������������������������������������������������19
9�3 User settings (optional) �������������������������������������������������������������������������������19
9�3�1 Setting of a time delay for the switching signals���������������������������������19
9�3�2 Setting of the output logic for the switching outputs ���������������������������20

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1 Preliminary note
1.1 Symbols used
►Instruction
> Reaction, result
[…] Designation of keys, buttons or indications
→Cross-reference
Important note
Non-compliance may result in malfunction or interference
Information
Supplementary note
9�3�3 Setting of the damping for the switching outputs��������������������������������20
9�3�4 Configuration of the display ����������������������������������������������������������������20
9�3�5 Zero point calibration ��������������������������������������������������������������������������21
9�4 Service functions �����������������������������������������������������������������������������������������22
9�4�1 Reading of the min/max values for system pressure��������������������������22
9�4�2 Reset of all parameters to factory setting �������������������������������������������22
10 Operation���������������������������������������������������������������������������������������������������������22
10�1 Reading of the set parameters ������������������������������������������������������������������22
10�2 Fault indication ������������������������������������������������������������������������������������������22
10�3 Setting ranges �������������������������������������������������������������������������������������������23
11 Factory setting �������������������������������������������������������������������������������������������������24

4
2 Safety instructions
• The device described is a subcomponent for integration into a system�
- The manufacturer is responsible for the safety of the system�
- The system manufacturer undertakes to perform a risk assessment and to
create documentation in accordance with legal and normative requirements
to be provided to the operator and user of the system� This documentation
must contain all necessary information and safety instructions for the operator,
the user and, if applicable, for any service personnel authorised by the
manufacturer of the system�
• Read this document before setting up the product and keep it during the entire
service life�
• The product must be suitable for the corresponding applications and
environmental conditions without any restrictions�
• Only use the product for its intended purpose (→ Functions and features).
• Only use the product for permissible media (→ Technical data).
• If the operating instructions or the technical data are not adhered to, personal
injury and/or damage to property may occur�
• The manufacturer assumes no liability or warranty for any consequences
caused by tampering with the product or incorrect use by the operator�
• Installation, electrical connection, set-up, programming, configuration, operation
and maintenance of the product must be carried out by personnel qualified and
authorised for the respective activity�
• Protect units and cables against damage�

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UK
3 Functions and features
The unit monitors the system pressure in pneumatic and compressed air networks
of machines and plants�
Applications
Compressed air (other media on request)
Type of pressure: relative pressure
Order no. Measuring range Permissible
overpressure Bursting pressure
bar PSI bar PSI bar PSI
PN7834 -1���10 -14�5���145 20 290 30 435
mbar PSI mbar PSI mbar PSI
PN7809
PY7809 -1 000���1 000 -14�5���14�5 20 000 290 30 000 435
MPa = bar ÷ 10 / kPa = bar × 100
Avoid static and dynamic overpressure exceeding the given overload
pressure by taking appropriate measures�
The indicated bursting pressure must not be exceeded�
Even if the bursting pressure is exceeded only for a short time, the unit
may be destroyed� NOTE: Risk of injury!
If pressures might occur which are higher than the permissible overpressure, you
should use other units of the PN70xx series� If you have any questions, please
contact ifm electronic's sales specialists�

6
4 Function
4.1 Processing of the measured signals
• The unit displays the current system pressure�
• It generates 2 output signals according to the parameter setting�
OUT1 • Switching signal for system pressure limit value�
OUT2
2 options
• Switching signal for system pressure limit value�
• Diagnostic signal (output 1 is inactive in case of a fault)�
4.2 Switching function
OUTx changes its switching state if it is above or below the set switching limits
(SPx, rPx)� The following switching functions can be selected:
• Hysteresis function / normally open: [OUx] = [Hno] (→ fig. 1).
• Hysteresis function / normally closed: [OUx] = [Hnc] (→ fig. 1).
First the set point (SPx) is set, then the reset point (rPx) with the requested
difference�
• Window function / normally open: [OUx] = [Fno] (→ fig. 2).
• Window function / normally closed: [OUx] = [Fnc] (→ fig. 2).
The width of the window can be set by means of the difference between SPx and
rPx� SPx = upper value, rPx = lower value�
1 2
P = system pressure; HY = hysteresis; FE = window

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4.3 Diagnostic function
Output 2 is used as diagnostic output based on the DESINA specification if
[OU2] = [dESI]�
• If there is no fault, the output is switched and carries UB+ (if P-n = PnP)
or UB- (if P-n = nPn)�
• In case of malfunctions in the following areas, the output is inactive:
- short circuit in output 1�
- EPROM function�
- RAM function�
- parameter setting�
- processor function�
4.4 Differential pressure measurement
Besides the main pressure connection
(1) the unit provides a ventilation
connection (2)� If both connections are
connected to the pressure system, the
unit can work as a differential pressure
sensor�
For proper function the following conditions must be met:
• The pressure at the main connection must always be greater than the
pressure at the ventilation connection�
• However, the pressure at the ventilation connection must not exceed
10 bar�
Note:
For differential pressure measurement the measurement accuracy deviates from
the specified accuracy (→ 12 Technical data). The deviation depends on the
amount of system pressure� It is 3�5 to 8�3 mbar per 1 bar system pressure�
The deviation can be minimised by setting an offset value (→ 9.3.5 Zero point
calibration)�

8
5 Mounting
Before installing and removing the unit: make sure that no pressure is
applied to the system�
►Screw the pressure connection or
adapter G⅛ to the main pressure
connection (1) and tighten�
Maximum tightening torque: 8 Nm�
Further possibilities: → the following sections.
5.1 Mounting accessories
The following components are available as accessories: Order no�
Mounting set for DIN rail mounting (DIN rail TH 35-7�5 to EN 60715) E37340
Adapter R⅛ to R⅛, can be aligned E37350
T pipe mounting set, includes:
• T pipe with 3 connections G½
• Reducer G½ to G⅛
• Adapter R⅛ to R⅛
E37360
Thread extension 1/8“ for flange mounting E30075
Push-in air fitting for tube Ø 6 mm E30076
Push-in air fitting for tube Ø 8 mm E30077
5.2 Pressure connections for differential pressure
measurement
►Remove the label from the
ventilation connection M5 (2),
connect to the pressure system�
Maximum tightening torque:
2�5 Nm�
►Connect the main pressure
connection G⅛ (1) to the pressure
system�
Maximum tightening torque: 8 Nm�

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5.3 DIN rail mounting
DIN rail TH 35-7�5 to EN 60715
►Fix the mounting clip (1) with the screws M4 x 40 (2) to the flange� Maximum
tightening torque: 2�5 Nm�
►Hook the unit into the DIN rail and clip it into place�
Removal:
►Lever out the mounting clip with a screwdriver at the top or at the bottom and
remove the unit�
5.4 Rear panel mounting
►Fix the unit with 2 screws M4 x 40 (1) (not included) to the rear panel�
Maximum tightening torque: 2�5 Nm�

10
5.5 Mounting on a pressure-carrying rear panel
1: main pressure connection
2: gland for pressure connection 2 mm
3: adapter plug (not included)
4: O-ring (not included)
5: fixing screws (not included)
► Cover the main pressure connection with an adapter plug G⅛ . Maximum
tightening torque: 8 Nm�
►Remove the gland for pressure connection�
►Insert the O-ring 3 x 2 and connect the connection to the medium-carrying
channel (diameter 2 mm)�
►Fix the unit with 2 screws M4 x 40 to the rear panel� Maximum tightening
torque: 2�5 Nm�

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5.6 Floor mounting
1: main pressure connection
2: fixing holes (4 threaded holes M3 or 4 bore holes with 4�5 mm diameter for fixing screws
M4)
3: bore hole for G⅛ adapter
4: bore hole for ventilation connection
5: fixing screws M3 (not included)
6: fixing screws M4 (not included)
►Arrange for bore holes for fixing screws and pressure connections in the floor
plate�
► Screw the pressure connection or adapter G⅛ to the main pressure
connection (1) and tighten� Maximum tightening torque: 8 Nm�
►For mounting in a pressure-carrying floor plate: insert an O-ring for sealing (not
included)�
►Place the unit on the floor plate� Screw 4 screws M3 from the top through the
flange into the floor plate� Maximum tightening torque: 1�5 Nm�
As an alternative:
►Place the unit on the floor plate� Screw 4 screws M4 from below through the
floor plate into the flange� Maximum tightening torque: 2�5 Nm�
The ventilation connection must not be obstructed by mounting or soiling�

12
5.7 Mounting on a maintenance unit
The unit can be integrated in maintenance units by means of an adapter R⅛
to R⅛ (order no. E37350) or by means of the T pipe mounting set (order no.
E37360)� When using the indicated accessories the pressure sensor can be
aligned�
Mounting with adapter
Mounting with T pipe mounting set

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6 Electrical connection
The unit must be connected by a qualified electrician�
The national and international regulations for the installation of electrical
equipment must be adhered to�
Voltage supply to EN 50178, SELV, PELV�
►Disconnect power�
►Connect the unit as follows:
2 x p-switching 2 x n-switching
Pin 1 Ub+
Pin 3 Ub-
Pin 4 (OUT1) • binary switching output pressure monitoring
Pin 2 (OUT2) • binary switching output if [OU2] = [Hno], [Hnc], [Fno] or [Fnc]
• diagnostic output if [OU2] = [dESI]
Core colours of ifm sockets:
1 = BN (brown), 2 = WH (white), 3 = BU (blue), 4 = BK (black)

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7 Operating and display elements
1 to 8: Indicator LEDs
- LED 1 to LED 3 = system pressure in the unit of measurement which is indicated on the
label�
- LEDs 4 to 6: not used,
- LED 7, LED 8 = switching state of the corresponding output�
9: Alphanumeric display, 4 digits
- Indication of the current system pressure�
- Indication of the parameters and parameter values�
10: Set button
- Setting of the parameter values (scrolling by holding pressed; incrementally by pressing
once)�
11: Mode/Enter button
- Selection of the parameters and acknowledgement of the parameter values

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8 Menu
8.1 Menu structure

16
8.2 Explanation of the menu
SP1/rP1 Upper / lower limit value for system pressure at which OUT1 switches�
SP2/rP2 Upper / lower limit value for system pressure at which OUT2 switches�
OU1 Output function for OUT1:
• Switching signal for the pressure limit values: hysteresis function [H ��] or
window function [F ��], either normally open [� no] or normally closed [� nc]�
OU2 Output function for OUT2:
• Switching signal for the pressure limit values: hysteresis function [H ��] or
window function [F ��], either normally open [� no] or normally closed [� nc]�
• Diagnostic signal [OU2] = dESI�
EF Extended functions / opening of menu level 2�
Uni Standard unit of measurement for system pressure�
HI Maximum value memory for system pressure�
LO Minimum value memory for system pressure�
tCOF Teach zero-point calibration�
COF Manually enter the zero point calibration�
dS1/dS2 Switch-on delay for OUT1 / OUT2�
dr1/dr2 Switch-off delay for OUT1 / OUT2�
P-n Output logic: pnp / npn�
dAP Damping for the switching outputs�
diS Update rate and orientation of the display�
rES Restore factory settings�

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9 Parameter setting
During parameter setting the unit remains in the operating mode� It continues its
monitoring function with the existing parameters until the parameter setting has
been completed�
9.1 General parameter setting
3 steps must be taken for each parameter setting:
1Parameter selection
►Press [Mode/Enter] until the
requested parameter is displayed�
2Setting of the parameter value
►Press [Set] and keep it pressed�
> Current setting value of the
parameter flashes for 5 s�
> After 5 s: setting value is changed:
incrementally by pressing the button
once or continuously by keeping the
button pressed�
Numerical values are incremented continuously� To reduce the value: let the display
move to the maximum setting value� Then the cycle starts again at the minimum
setting value�
3Acknowledgement of the parameter
value
►Press [Mode/Enter] briefly�
> The parameter is displayed again�
The new setting value is stored�
Setting of other parameters:
►Start again with step 1�
Finishing the parameter setting:
►Press [Mode/Enter] several times until the current measured value is displayed or wait
for 15
s�
> The unit returns to the operating mode�

18
• Change from menu level 1 to menu level 2:
►Press [Mode/Enter] until [EF] is
displayed�
If the submenu is protected with an
access code,"Cod1" flashes in the
display�
►Press [Set] and keep it pressed until
the valid code no� is displayed�
►Press [Mode/Enter] briefly�
On delivery by ifm electronic: no access
restriction�
►Press [Set] briefly�
> The first parameter of the sub-menu
is displayed (here: [Uni])�
• Locking / unlocking
The unit can be locked electronically to prevent unintentional settings�
►Make sure that the unit is in the
normal operating mode�
►Press [Mode/Enter] + [Set] for 10 s�
> [Loc] is displayed�
During operation: [Loc] is briefly displayed if you try to change parameter values�
For unlocking:
►Press [Mode/Enter ] + [Set] for 10 s�
> [uLoc] is displayed�
On delivery: unlocked�
• Timeout:
If no button is pressed for 15 s during parameter setting, the unit returns to the
operating mode with unchanged values�

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9.2 Setting of the output signals
9.2.1 Setting of the unit of measurement for system pressure
►Select [Uni] and set the unit of measurement:
[bAr], [mbar], [MPa], [kPa], [PSI]�
9.2.2 Setting of the output function
►Select [OU1] and set the function:
- [Hno] = hysteresis function / normally open
- [Hnc] = hysteresis function / normally closed,
- [Fno] = window function / normally open,
- [Fnc] = window function / normally closed�
►Select [OU2] and set the function:
- [Hno] = hysteresis function / normally open,
- [Hnc] = hysteresis function / normally closed,
- [Fno] = window function / normally open,
- [Fnc] = window function / normally closed,
- [dESI] = output 2 is used as a diagnostic output�
9.2.3 Setting of the switching limits
►Select [SP1] / [SP2] and set the value at which the output switches�
►Select [rP1] / [rP2] and set the value at which the output switches off�
rPx is always smaller than SPx� The unit only accepts values which are
lower than the value for SPx�
9.3 User settings (optional)
9.3.1 Setting of a time delay for the switching signals
[dS1] / [dS2] = switch-on delay for OUT1 / OUT2�
[dr1] / [dr2] = switch-off delay for OUT1 / OUT2�
►Select [dS1], [dS2], [dr1] or [dr2] and set a value between 0�1 and 50 s
(at 0�0 the delay time is not active)�

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9.3.2 Setting of the output logic for the switching outputs
►Select [P-n] and set [PnP] or [nPn]�
9.3.3 Setting of the damping for the switching outputs
►Select [dAP] and set a value�
dAP value = response time between pressure change and change of the
switching status in milliseconds�
The following fix values can be set; they define the switching frequency (f)
of the output:
dAP 3 6 10 17 30 60 125 250 500
f [Hz] 170 80 50 30 16 8 4 2 1
9.3.4 Configuration of the display
►Select [diS] and set the update rate and orientation of the display:
- [d1]: update of the measured values every 50 ms�
- [d2]: update of the measured values every 200 ms�
- [d3]: update of the measured values every 600 ms�
- [rd1], [rd2], [rd3]: display as for d1, d2, d3; rotated by 180°�
- [OFF]: the display is switched off in the operating mode�
This manual suits for next models
3
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