OB5026 - Switch IFM - Free user manual and instructions

Product type	Fiber optic amplifier
Model	OB5026
Brand	IFM
Power supply	24 V DC (according to standard wiring)
Main functions	Contactless object detection, automatic and manual switching threshold adjustment, pulse extension
Protection	IP65 (cover closed)
Mounting	On DIN rail or mounting device
Connection	Screw terminals or cable (depending on version); wires: BN = +V, BU = GND, BK = switching, VT = diagnostic
Display	Green LEDs (reserve/capacity), red LED (error/contamination), yellow LED (switching status)
Threshold adjustment	Automatic (with or without object) or manual (+ and - buttons)
Pulse extension	Adjustable from 0 to 90 ms (in steps of ~1 ms)
Switching output	NPN or PNP transistor (depending on wiring); short-circuit protected
Diagnostic output	Active in case of error (contamination, short circuit); max load 10 mA
Maintenance	Clean the fiber optics with a soft cloth, avoid contamination
Operating temperature	Not specified, typical -25 to 70 °C for IFM products
Dimensions	Not specified, approx. 50 x 30 x 20 mm (estimate)
Weight	Not specified, approx. 50 g (estimate)

Frequently Asked Questions - OB5026 IFM

How to mount the fiber optics on the OB5026 amplifier?

Unscrew screw A, insert the fiber optics into the holes of cell B until the stop, then tighten screw A. Respect the stop to avoid a reduction in range.

What is the recommended supply voltage?

Electrical connection must be carried out with the power off. The typical supply voltage is 24 V DC. The wires are color-coded: brown (+V), blue (GND), black (switching output), violet (diagnostic output).

How to perform automatic switching threshold adjustment with moving objects?

Pass the objects through the optical beam, press until the LED ramp flashes, then press twice to confirm. The cell calculates the optimal threshold.

What to do if the red LED stays on after adjustment?

The red LED indicates a detection error (incorrect adjustment or contamination of the fibers). Check the cleanliness of the fibers and repeat the automatic or manual adjustment.

How to adjust the pulse extension?

Press until the yellow and green LEDs flash alternately, then use the + or - buttons to adjust the delay (1 press ≈ 1 ms). Wait 10 s to confirm.

Can I use this amplifier with any fiber optic?

No, the device is designed for ifm fiber optics of type FE-50 and FT-50 only. Using other fibers may reduce the range or impair operation.

How to clean the fiber optics?

Use a soft, lint-free cloth to clean the fiber ends. Avoid contamination which may cause detection errors.

What is the maximum detection range?

The range depends on the fiber optic used. Consult the fiber specifications for its maximum range.

How to distinguish automatic from manual adjustment?

In programming mode (flashing LED ramp), if only the green LED flashes, it is manual mode. If the yellow and green LEDs flash alternately, it is automatic mode.

What does a fast flashing of the LED ramp mean?

A fast flashing indicates a short circuit on the switching output. Check the wiring and eliminate the fault. The diagnostic output deactivates approximately 4 s after resolution.

USER MANUAL OB5026 IFM

Technical line drawing of a mechanical component with threaded end and mounting holes (no text or symbols)

Deutsch

Controls and indicators 10

Mounting 11

Mount the fibre optics 11

Electrical connection 11

Automatic setting of the switching threshold (1) 12

Automatic setting of the switching threshold (2) 13

Manual setting of the switching threshold (1) 14

Manual setting of the switching threshold (2) 15

Adjust of the pulse stretching 16

Operation 16

Français

The switching amplifier senses objects and materials without contact and indicates their presence by a switching signal.

• Only for the connection of the ifm fibre optics type FE-50 and FT-50.
• Sensing range depends on the fibre optic.
• Pulse stretching 0 or adjustable between 2 and 90ms.

(Each input pulse is stretched to the set value).

Controls and indicators

green LEDs:

• in operating mode: excess gain in %
• in programming mode: strength of input signal red LED:
  lights in the uncertain reception zone (maladjustment, soiling of the lens)

T2: starts the setting of the pulse stretching

yellow LED:

switching status, lights when the output is switched

green LED:

lights when ready for operation

T1: starts the manual setting of the switching

T1 + T2: starts the automatic setting of the switching threshold

Mounting

Mount the unit on a DIN rail or by means of a mounting fixture.

Mount the fibre optics:

1. Loosen the screw A.
2. Push the fibre optics into the sensor holes B until you feel a stop and hold them.
3. Tighten the screw A.

If the fibre optics are not in contact with the internal optics, the sensing range is reduced.

Electrical connection

Isolate the power, then connect the unit as specified (see the last page or the type label).

• Core colours (for sensors with cable connection): BN = brown, BU = blue, BK = black, VT = violet.
• Programming of the output function by wiring (see the last page or the type label).
• Load of the function check output (fc-output): max. 10mA.

Automatic setting of the switching threshold (1)

• Objects move through the detection area
• Diffuse reflection fibre (FT ...) and through-beam fibre (FE ...)

The unit detects input signals of various intensity in any sequence and calculates the optimum switching threshold.

1

Allow the objects to pass trough the detection area.Press until the row of LEDs flashes.

→

Yellow and green LEDs flash alternately (= unit is in the programming mode).

2

Press once.

Yellow and green LEDs go out for a short time, then flash again alternately.

3	Press once.			Yellow and green LEDs go out for a short time,
				then the green LED is on (= unit is in the operating mode).

If the setting of the switching threshold is not possible (e.g. object signal and background signal are about the same), the row of LEDs flashes after step 3. The unit then passes into the operating mode with the switching threshold being unchanged.

Automatic setting of the switching threshold (2)

• Stationary objects
• Diffuse reflection fibre (FT ...) and through-beam fibre (FE ...)

The unit detects input signals of various intensity in any sequence and calculates the optimum switching threshold.

1

Press until the row of LEDs flashes.

Yellow and green LEDs flash alternately (= unit is in the programming mode).

2

Place the object into the detection area.*Press once.

Yellow and green LEDs go out for a short time, then flash again alternately.

3	Remove the object.*Press once.			Yellow and green LEDs go out for a short time,
				then the green LED is on (= unit is in the operating mode).

* You can also proceed in reverse order: first setting without the object, then with the object.

If the setting of the switching threshold is not possible (e.g. object signal and background signal are about the same), the row of LEDs flashes after step 3. The unit then passes into the operating mode with the switching threshold being unchanged.

Manual setting of the switching threshold (1)

- Stationary objects / Diffuse reflection fibre (FT ...)

1	Press until the row of LEDs flashes.		[Green LED flashes,yellow LED indicates theswitching status(= unit is in theprogramming mode).
2	Place the object into the detection area.		Object signal is measured and indicated (= row of dimly lit LEDs)brightly flashing LED = current switching threshold.
3	Remove the object.		Background signal is measured and indicated(= row of dimly lit LEDs).
4	Press the "+" or "-" button until the switching threshold is in the middle between the background signal and the object signal;(here: reducing the switching threshold).
5	Press until the row of LEDs flashes.		[Green LED lights(= unit is in the operating mode).

Manual setting of the switching threshold (2)

- Stationary objects / through-beam fibre (FE ...)

1

Press until the row of LEDs flashes.

Green LED flashes,yellow LED indicates theswitching status(= unit is in theprogramming mode).

Green LED flashes, yellow LED indicates the switching status (= unit is in the programming mode).

2

Press the “-” button until the row of LEDs indicates the lowest switching threshold.

3

Place the object into the detection area.Press the “+” button until the unit switches (yellow LED lights or goes out).

or

4

Press until the row of LEDs flashes.

Green LED lights(= unit is in the operating mode).

Green LED lights (= unit is in the operating mode).

Adjust of the pulse stretching

1	Press until the row of LEDs flashes.		Yellow and green LEDs flash alternately (= unit is in the programming mode).
2	Press the "+" or "-" button to set the desired delay time (here: increasing delay time).1 x = about 1ms; hold the button pressed for fast setting.
3	Wait for approx. 10s.		Green LED lights (= unit is in the operating mode).

Operation

Only open the cover to make adjustments. Close it after the adjustment has been made in order to maintain the protection IP65.

Check whether the unit functions properly. Indication by LEDs and by the function check output:

• Red LED lights: wrong sensing of the object (maladjustment, soiling of the lens).
• Row of LEDs flashes quickly: output short-circuited / slowly: internal malfunction.

The function check output switches in the case of

• wrong sensing of the object (maladjustment, soiling of the lens), reset after the object has been sensed again properly;
• a short circuit of the switching output, reset about 4s after the fault has been eliminated.