Keyence GS interlock switch

8 green AUX output status monitoring

Cascade wiring example (two locked switches in series):

The OSSD1/2 (black, gray) of the first switch is connected to the safety input 1/2 (white, certain pin) of the second switch.

The OSSD1/2 of the second switch is connected to the safety relay.

Locking the control line (powder) requires simultaneous control of all switches (in parallel), otherwise partial locking and partial unlocking may occur.

It is recommended to use star connection for both 0V (blue) and+24V (brown) of all switches to avoid voltage drop.

4.4 Integrated emergency stop button

Connect the normally closed contact of the emergency stop button in series with the front end of the safety input of the first switch. Attention: The emergency stop contact must comply with the mandatory disconnection structure required by ISO 13849.

Chapter 5 Common Malfunctions and Troubleshooting Methods

5.1 Fault phenomenon: After the door is closed, the indicator light remains red and the safety output is not turned on

Possible reasons:

The actuator has not fully entered the switch slot (such as door sagging).

The encoding mode is set to HIGH, but the actuator is not learned.

The non-contact distance exceeds 18mm or the lateral offset is too large.

Exclusion steps:

Manually press down the door and observe if the indicator light turns green. If it remains unchanged, loosen the actuator fixing screw and fine tune the position.

Enter High encoding learning mode: Power on the switch, insert the actuator to be learned into the slot (or near the sensing surface), and hold for 5 seconds before the switch automatically memorizes.

For non-contact types, measure the gap with a feeler gauge to ensure it is ≤ 18mm.

5.2 Fault phenomenon: The locking type cannot be locked/unlocked, or there is high mechanical resistance when locking

Possible reasons:

The voltage of the lock control signal (pink line) is insufficient (<19V).

Mechanical jamming: foreign objects or deformations in the actuator or switch head.

Internal wear and tear of the locking mechanism (often occurring in doors that are frequently opened and closed).

Exclusion steps:

Measure the voltage of the pink wire to 0V, which should be within the range of 24V ± 10%. If it is too low, check the power cord diameter and voltage drop.

Disconnect the power and use a manual release tool (Allen wrench) to try turning the lock tongue and feel if it is stuck. If it is stuck, the switch needs to be replaced.

Check for burrs or dents on the surface of the actuator and replace it if necessary.

5.3 Fault phenomenon: After a certain switch in the cascade system is turned on, the safety output of the entire system is not cut off

Possible reasons:

The OSSD output of this switch has an internal short circuit failure.

In the cascading connection, the OSSD output was mistakenly connected to the input of the same switch (self loop).

Exclusion steps:

Disconnect the cascade circuit and test each switch separately: directly supply power to the switch, manually trigger the actuator, and measure whether the OSSD output switches normally.

If the OSSD remains high when a certain switch is turned on, it is determined that the switch has an internal fault and needs to be replaced.

Confirm the cascading sequence: OSSD output of the first switch → safety input of the second switch → OSSD output of the second switch → third... Do not cross.

5.4 Fault phenomenon: AUX output status is inconsistent with OSSD

Possible reasons:

AUX output configuration is set to "diagnostic" mode instead of "door status" mode (some models can be set through software).

Wiring error: AUX negative output.

Exclusion steps:

Refer to the manual to confirm the default logic of AUX: usually AUX is opposite to OSSD (AUX=ON when the door is open, AUX=OFF when the door is closed).

Measure the voltage of AUX to 0V with a multimeter. The PNP type output should be 24V or 0V, and the NPN type should be checked for connectivity with COM.

5.5 Fault phenomenon: IP69K switch has water ingress inside after washing with water

Reason: M12 connector not tightened or cable sheath damaged.

Countermeasure:

During installation, the M12 nut must be turned to a "click" sound and it is recommended to wrap it with waterproof tape.

Check if the cable entrance is facing downwards to prevent water from entering the connector along the cable.

Chapter 6 Maintenance and Security Verification

6.1 Regular inspection items (once every quarter)

Locking force test: Use a force gauge to pull the locked door, and the maximum force should be greater than 1500N (2000N from the factory, allowed to decrease by 20% after wear).

Switch distance verification (non-contact type): Measure the gap with a feeler gauge and record it. If it exceeds 18mm, readjust the bracket.

Response time measurement: Use an oscilloscope to capture the time from the moment the door opens to the falling edge of OSSD, which should be less than 20ms.

Indicator light brightness: It should be clear and distinguishable under ambient light. If it becomes dim, consider replacing the internal LED (overall switch replacement).

6.2 Standard process for replacing faulty switches