Ifm Pq78 series User manual

Operating instructions

Pressure sensor

PQ78xx UK

80007231 / 00 06 / 2019

2

Contents

1 Preliminary note��3

1�1 Symbols used ��3

2 Safety instructions ��3

3 Functions and features ��4

4 Function��5

4�1 Processing of the measured signals��5

4�2 Switching function��5

4�3 Diagnostic function ��6

5 Mounting��6

5�1 Mounting accessories��6

5�2 DIN rail mounting��7

5�3 Rear panel mounting ��7

6 Electrical connection��8

7 Operating and display elements ��9

8 Menu��10

8�1 Menu structure��10

8�2 Explanation of the menu�� 11

9 Parameter setting ��12

9�1 General parameter setting��12

9�2 Setting of the output signals ��14

9�2�1 Setting of the unit of measurement for system pressure ��14

9�2�2 Setting of the output function��14

9�2�3 Setting of the switching limits (hysteresis function) ��14

9�2�4 Setting of the switching limits (window function) ��14

9�3 User settings (optional) ��15

9�3�1 Setting of a time delay for the switching signals��15

9�3�2 Setting of the damping for the switching outputs��15

9�3�3 Configuration of the display ��15

9�3�4 Zero point calibration ��16

9�4 Service functions ��16

9�4�1 Reading of the min/max values for system pressure��16

9�4�2 Reset of all parameters to factory setting ��16

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1 Preliminary note

1.1 Symbols used

►Instruction

> Reaction, result

[…] Designation of pushbuttons, buttons or indications

→Cross-reference

Important note:

Non-compliance can result in malfunctions or interference�

2 Safety instructions

• The device described is a subcomponent for integration into a system�

- The manufacturer of the system is responsible for the safety of the system�

- The system manufacturer undertakes to perform a risk assessment and to

create a 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�

10 Operation��17

10�1 Reading of the set parameters ��17

10�2 Fault indication ��17

10�3 Setting ranges ��17

11 Factory setting ��18

4

• 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, operation and maintenance of the unit

must be carried out by qualified personnel authorised by the machine operator�

• Protect units and cables against damage�

For the scope of validity cULus:

The device shall be supplied from an isolating transformer having a secondary

Listed fuse rated either

a) max 5 amps for voltages 0~20 Vrms (0~28�3 Vp) or

b) 100/Vp for voltages of 20~30 Vrms (28�3~42�4 Vp)�

The Sensor shall be connected only by using any R/C (CYJV2) cord, having

suitable ratings�

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

PQ7809 -1��1 -14�6��14�5 20 290 30 435

PQ7834 -1��10 -15��145 20 290 30 435

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!

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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 FHx and

FLx� FHx = upper value, FLx = lower value�

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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] = [diA]�

• If there is no fault, the output is switched and carries Ub+ �

• 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�

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�

Maximum thread length: 7�5 mm�

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

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

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5.2 DIN rail mounting

DIN rail TH 35-7�5 to EN 60715

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►Fix the mounting clip (1) with the screws M4 x 35 (2) to the flange� Maximum

tightening torque: 0�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�

5.3 Rear panel mounting

20

►Fix the unit with 2 screws M4 x 35 (1) (not included) to the rear panel�

Maximum tightening torque: 0�5 Nm�

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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:

4

L

L+

2

1

3

Out 1

Out 2

4:

2:

2

1

4

3

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] = [diA]

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7 Operating and display elements

1 2 3 4 5 6 78

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9

11

Mode/Enter Set

1 to 8: Indicator LEDs

- LED 1 to LED 4 = system pressure in the unit of measurement which is indicated on the

label�

- LEDs 5 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

S

M

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M

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M

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M

S

M

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M

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S

M

RUN

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S

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S

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M

S

M

S

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8.2 Explanation of the menu

SP1/rP1 Upper / lower limit value for system pressure at which OUT1 switches�

FH1/FL1 Upper / lower limit for the acceptable range (monitored by OUT1)�

SP2/rP2 Upper / lower limit value for system pressure at which OUT2 switches�

FH2/FL2 Upper / lower limit for the acceptable range (monitored by OUT2)�

EF Extended functions / opening of menu level 2�

rES Restore factory settings�

dS1 Time delay for SP1 / FH1�

dS2 Time delay for SP2 / FH2�

dr1 Time delay for rP1 / FL1�

dr2 Time delay for rP2 / FL2�

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] = diA�

uni Standard unit of measurement for system pressure�

Lo Maximum value memory for system pressure�

Hi Minimum value memory for system pressure�

dAP Damping for the switching outputs�

coF Manually enter the zero point calibration�

tcoF Teach zero-point calibration�

diS Update rate and orientation of the display�

cLor Colour of the digital display (permanent or alternating with switching status

OUT1)�

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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�

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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�

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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�

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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�

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• 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�

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►Press [Set] briefly�

> The first parameter of the sub-menu

is displayed (here: [uni])�

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• 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�

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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�

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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], [kPa], [PSI], [inHg]�

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,

- [diA] = output 2 is used as a diagnostic output�

9.2.3 Setting of the switching limits (hysteresis function)

►Make sure that the function [Hno] or [Hnc] is set for [ou1] or [ou2]�

►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�

9.2.4 Setting of the switching limits (window function)

►Make sure that the function [Fno] or [Fnc] is set for [ou1] or [ou2]�

►Select [FH1] / [FH2] and set the upper limit of the acceptable range�

►Select [FL1] / [FL2] and set the lower limit of the acceptable range�

FLx is always lower than FHx� The unit only accepts values which are lower

than FHx�

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9.3 User settings (optional)

9.3.1 Setting of a time delay for the switching signals

• [dS1] / [dS2] = time delay for SP1 / SP2 / FH1 / FH2�If the system

pressure exceeds SPx or if the system pressure enters the acceptable

range (window), the output changes the switching status when the time

dSx has elapsed�

• [dr1] / [dr2] = time delay for rP1 / rP2 / FL1 / FL2� If the system pressure

falls below rPx or if the system pressure leaves the acceptable range

(window), the output changes the switching status when the time drx has

elapsed�

►Select [dS1], [dS2], [dr1] or [dr2] and set the value between 0 and

5000 ms in steps of 2 ms (at 0 the time delay is not active)�

9.3.2 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 2�5 5 10 30 60 100 250 500 1000 2000

f 200 100 50 16 8 5 2 1 0�5 0�25

9.3.3 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�

- [Ph]: Display of the measured peak value remains for a short time

(peak hold)�

- [rd1], [rd2], [rd3], [rPH]: display as for d1, d2, d3; rotated by 180°�

- [OFF]: the display is switched off in the operating mode�

►Select [cLor] and define the colour of the digital display�

- [r-on]: display = red if output 1 is switched; display = green if output 1

is not switched�

- [G-on]: display = green if output 1 is switched; display = red if output

1 is not switched�

- [red]: the colour of the display is red / does not change�

- [Gren]: the colour of the display is green / does not change�

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9.3.4 Zero point calibration

►Select [coF] and set a value between -5 % and 5 % of the measuring

span� The internal measured value "0" is shifted by this value�

As an alternative: automatic adjustment of the offset in the range 0 bar ± 5

% of the measuring span�

►Make sure that the differential pressure is 0 bar or as close as possible

to the 0 bar mark�

►Press [Mode/Enter] until [tcoF] appears�

►Press [Set] and keep it pressed�

> The current offset value ( in %) briefly flashes�

►Release [SET]�

►Press [Mode/Enter] briefly (= to confirm the new offset value)�

Reset of the teached value:

►Select [coF] and set the value [0]�

9.4 Service functions

9.4.1 Reading of the min/max values for system pressure

►Select [Hi] or [Lo], briefly press [Set]�

[Hi] = maximum value, [Lo] = minimum value�

Delete memory:

►Select [Hi] or [Lo]�

►Press [Set] and keep it pressed until [----] is displayed�

►Press [Mode/Enter] briefly�

9.4.2 Reset of all parameters to factory setting

►Select [rES]�

►Press [Set] and keep it pressed until [----] is displayed�

►Press [Mode/Enter] briefly�

We recommend taking down your own settings in the table before carrying

out a reset (→ 13 Factory setting).

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10 Operation

After power on, the unit is in the Run mode (= normal operating mode)� It carries

out its measurement and evaluation functions and provides output signals

according to the set parameters�

Operating indications → chapter 7 Operating and display elements.

10.1 Reading of the set parameters

►Press [Mode/Enter] until the requested parameter is displayed�

►Press [Set] briefly�

> The unit displays the corresponding parameter value for about 15 s� After

another 15 s the unit returns to the Run mode�

10.2 Fault indication

[OL] Overload pressure (measuring range exceeded)

[UL] Underload pressure (below measuring range)

[SC1] Short circuit in OUT1*

[SC2] Short circuit in OUT2*

[SC] Short circuit in both outputs*

[Err] Flashing: internal fault

*The output concerned is switched off as long as the short circuit exists�

The messages SC1, SC2, SC, and Err are shown even if the display is switched off�

10.3 Setting ranges

SPx / FHx rPx / FLx ΔP

min max min max

PQ7809

bar -0�98 1�00 -0�99 0�99 0�01

kPa -98 100 -99 99 1

PSI -14�2 14�6 -14�4 14�4 0�2

inHG -28�8 29�7 -29�1 29�4 0�3

PQ7834

bar -0�90 10�00 -0�95 9�95 0�05

kPa -90 1000 -95 995 5

PSI -13 145 -14 144 1

inHG -26 296 -28 294 2

ΔP = step increment

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11 Factory setting

Factory setting User setting

SP1/FH1 25% VMR*

rP1/FL1 23% VMR*

ou1 Hno

ou2 Hno

SP2/FH2 75% VMR*

rP2/FL2 73% VMR*

coF 0.0

dS1 0

dr1 0

dS2 0

dr2 0

dAP 2.5

diS d2

uni bAr

cLor r-on

* = the indicated percentage of the final value of the measuring range (VMR) of the

corresponding sensor in bar is set

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IFM PQ78 Series User manual

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