IFM Electronic PQ7809, PQ7834 Operating Instructions Manual

Operating instructions

Pressure sensor

PQ78xx

80007231 / 00 06 / 2019

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

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

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�

• 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

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

Avoid static and dynamic overpressure exceeding the given overload

Permissible

Bursting pressure

overpressure

MPa = bar ÷ 10 / kPa = bar × 100

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!

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�

2 options

OUT2

• 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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P = system pressure; HY = hysteresis; FE = window

1 2

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

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 

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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:

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

Order no�

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