OG8501 - Photoelectric sensor IFM - Free user manual and instructions

Brand	IFM
Model	OG8501
Product type	Photoelectric sensor (photoelectric barrier)
Detection principle	Through-beam (separate emitter and receiver)
Range	Refer to the device label
Power supply	Galvanically isolated power supply with overload protection (typ. 10-30 V DC)
Electrical connection	Brown (BN): +; Blue (BU): -; Black (BK): output; Color code according to label
Switching output	Programmable by wiring (see label)
Diagnostic output	Available on PIN 2, max. current 10 mA
Main functions	Contactless detection, sensitivity adjustment with or without object, lock/unlock
LED indications	Green LED: device operational; Yellow LED: output switched; Red LED: detection error, short circuit or internal error
Programming mode	Activate by pressing the button for 2 s until red flashes; then adjust with/without object
Max sensitivity adjustment	Interrupt the beam then press the button twice in programming mode
Lock/Unlock	Press for 10 s to lock/unlock the device
Maintenance and cleaning	Clean lenses without solvents or harsh chemicals
Safety	Disconnect power before connection; comply with UL 508 standard for limited voltage

Frequently Asked Questions - OG8501 IFM

How to adjust the sensitivity of the OG8501 sensor?

To adjust the sensitivity, activate programming mode by pressing the button for about 2 seconds until the red LED flashes. Then press once with the object in the detection zone, then once without object. The yellow and green LEDs flash alternately during adjustment.

What does a flashing red LED mean?

A flashing red LED indicates an error during object detection, for example incorrect adjustment or dirty lenses.

How to clean the sensor lenses?

Clean the lenses without using solvents or products that could damage them. Use a soft dry cloth.

What is the required supply voltage?

The device requires a galvanically isolated power supply with overload protection, typically 10-30 V DC.

How to lock or unlock the sensor?

Press the button for 10 seconds. To lock, the red LED lights briefly then yellow and green LEDs flash alternately. To unlock, repeat the operation.

What to do if sensitivity adjustment fails?

If adjustment is not possible, the red LED flashes for about 2 seconds after step 3, then the sensor returns to operation mode without sensitivity modification.

How to interpret the yellow and red LEDs flashing alternately?

Alternate flashing at 2 Hz indicates a short circuit at the output; at 1 Hz, an internal error (output not switched).

What is the function of the diagnostic output?

The diagnostic output switches in case of detection error (bad detection, soiling) after 4 seconds, and resets 4 seconds after returning to normal. In case of short circuit, it switches immediately and resets after 2 seconds after error clearance.

How to adjust maximum sensitivity?

Activate programming mode, interrupt the beam, then press the button twice (steps 2 and 3).

What safety precautions should be taken during connection?

Disconnect the installation from power before connecting the sensor. Ensure the power supply is galvanically isolated and complies with UL 508 standard for 'limited voltage'.

USER MANUAL OG8501 IFM

Functions and features

The through-beam sensor detects objects and materials without contact and indicates their presence by a switched signal.

Range (r): see type label.

Electrical connection

The device shall be supplied from an isolating source and protected by an overcurrent device such that the limited voltage circuit requirements in accordance with UL 508 are met.

Isolate power, then connect the unit (see page 17 or type label). Core colours (for sensors with cable connection): BN = brown, BU = blue, BK = black.

Programming of the output function by wiring (see page 17 or type label). Load of the function check output (fc output): max. 10mA

Installation

Fix the receiver (type OGE-...) in position.

Align the transmitter (type OGS-...) towards the receiver and tighten in the same way. Maximum range is only possible with precise alignment.

NB: Commissioning

The through-beam sensor is supplied ready to operate (plug and play) set at the max. sensing range. This is sufficient if the through-beam sensor can operate with maximum excess gain (highest contrast). The following setting procedures should only be necessary in less straightforward applications, for example if partly transparent objects must be detected.

Setting of the sensitivity with stationary objects

1	Activate the programming mode of the unit. 接收er transmitter Press for about 2s until the red LED flashes.
	The red LED goes out; the yellow and green LEDs flash alternately. The unit is in the programming mode.

2	Set the sensitivity with object. receiver Press once.
	The yellow and green LEDs go out for approx. 1s, then flash again alternately.

3	Set the sensitivity without object. receiver transmitter Press once.
	The yellow and green LEDs go out for approx. 1s, then the green LED is on. The 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 sensitivity is not possible (e.g. object signal and background signal are about the same), the red LED flashes after step 3 for approx. 2s. The unit then passes into the operating mode with the sensitivity being unchanged.

Setting of the sensitivity with moving objects

1	Activate the programming mode of the unit. 接收er transmitter Press for about 2s until the red LED flashes.
	The red LED goes out; the yellow and green LEDs flash alternately. The unit is in the programming mode.

2	During the measurement (approx. 1s) allow at least two objects to move through the sensing area of the lens. Press once.
	The yellow and green LEDs go out for approx. 1s, then flash again alternately.

3

During the measurement (approx. 1s) allow at least two objects to move through the sensing area of the lens. Press once.

The yellow and green LEDs go out for approx. 1s, then the green LED is on. The unit is in the operating mode.

If the setting of the sensitivity is not possible (e.g. object signal and background signal are about the same), the red LED flashes after step 3 for approx. 2s. The unit then passes into the operating mode with the sensitivity being unchanged.

Setting of the maximum sensitivity

• Go into the programming mode (step 1).
• Interrupt the light beam.
• Press the setting button twice (see steps 2 and 3).

Locking/Unlocking:

Press for 10s.	The red LED lights for a short time, then the yellow and green LEDs flash alternately; after 10s the LEDs go out, the unit is locked.
Press for 10s.	After 10s the LEDs go out, locking is annulled.

Operation

Check the safe functioning of the through-beam sensor. Display by LEDs and by the function-check output.

LED green is lit unit is ready for operation
LED yellow is lit output is switched
LED red is lit	error in object detection, e.g. maladjustment, soiling of the lenses
LEDs yellow + red	flashing alternately, 2 Hz: output short-circuited flashing alternately, 1 Hz: internal malfunction (output is not switched)

Function check output

(not for sensors with cable connection)

• Switches in the case of incorrect object detection (error in object detection, maladjustment, soiling of the lenses) after approx. 4 s, it switches back approx. 4 s after the object is again correctly detected.
• Immediately switches in the case of a short circuit of the switching output, it switches back approx. 2 s after the fault has been rectified.
• Immediately switches in the case of an internal fault, it is only switched back by turning off the operating voltage and then on again.

Maintenance

Keep the lens of the sensor free from soiling. For cleaning do not use any solvents or cleaning agents which could damage the plastic lenses.