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Keyence SZ-V Inspection Procedure

The following sections are copied from the Keyence SZ-V User Manual (Keyence document AS 116131 p147 – 9/22/2021). Please reference the Keyence SZ-V User Manual for additional information.

Daily Inspection​

KEYENCE Corporation recommends that you perform the daily inspection based on the following items. The frequency of maintenance and inspections are critical factors that you must consider in your risk assessment.

Pre-check for installation conditions​

  • The SZ-V is installed so that the machine operator cannot go into or approach the hazardous area or hazards without passing through the protection zone of the SZ-V.

  • The SZ-V is installed so that the machine operator cannot go into or approach the hazardous area or hazards without passing through any of the protection zone of the SZ-V belonging to the bank switching function.

  • The SZ-V is installed at a location free from light interference, for example an incandescent lamp and a halogen lamp.

  • There is no damage to the cable insulation. Additionally, the protection against the disconnection or short-circuit of cable, which might be caused by crushing or being caught in a machine, is considered.

Pre-check test while the machine is stopped.​

You should do the following pre-check test with the test piece to make sure the operation of the SZ-V while the machine is stopped. In this case, you should supply the power only to the SZ-V.

The test piece should match the minimum detectable object size you chose.

When using PROFIsafe or CIP Safety™, inspection should be performed by confirming the value of "Protection Zone State", not the OSSD indicator.

“The OSSD indicator lights in red” means that "Protection Zone State” is “0".

"The OSSD indicator lights in green" means that "Protection Zone State” is “1".

  • The OSSD indicator lights in red when the test piece is present in the specified protection zone. This test must be performed for the whole specified protection zone. If the bank switching function or bank function is applied to the SZ-V, this test must be performed for the whole and every specified protection zone. If the muting function is applied to a part of the protection zone, this test must be performed during muted condition for the whole specified protection zone, except for muting zone.

  • The OSSD indicator lights in red when the SZ-V detects the test piece at the intended detection plane (height) while the test piece vertical to the detection plane moves in the protection zone. This test must be performed for the whole specified protection zone.

  • The OSSD indicator lights in green when the SZ-V starts normal operation after power on (when "SZ-V Start Up" is changed to "Normal Operation" on the display) and detects no object in the protection zone with "Automatic/Automatic" for the configuration of start/restart mode.

  • The OSSD indicator continues to light in red and the interlock indicator lights in yellow, when the SZ-V starts normal operation after power on (when "SZ-V Start Up" is changed to "Normal Operation" on the display) with either "Manual/Manual" or "Manual/Automatic" for the configuration of start/restart mode. Continuously, the OSSD indicator lights in green and the interlock indicator lights off in the event of reset operation, if the SZ-V detects no object in the protection zone at that time.

  • The OSSD indicator lights in red and the interlock indicator lights in yellow when the SZ-V detects the test piece in the protection zone with "Manual/Manual" for the configuration of start/restart mode.

Continuously, the OSSD indicator continues to light in red and the interlock indicator flashes in yellow when the test piece is removed from the protection zone.

  • The OSSD indicator lights in green after the specified delay time has been passed if the ON-delay function is applied to the SZ-V.

Pre-check test while the machine operates.​

The purpose of this pre-check test is to make sure that the machine (hazards) stops its operation. This test must be performed after you ensure that there is nobody in the hazardous zone.

  • Machine (hazard) stops its operation if the test piece is present in the specified protection zone.

  • The machine (hazard) stops its operation when the power for the SZ-V is disconnected.

  • The machine (hazard) stops its operation when the interlock indicator lights in yellow.

  • The response time for overall safety-related control system (from the intrusion of test piece in the protection zone to the machine stop) is less than overall response time (T) used for the calculation of safety distance.

    • For this system, T is calculated to be 0.708ms.

Regular (Periodic) Inspection​

The responsible personnel must perform a regular inspection at least once a year.

Additionally, you should perform a regular inspection if you make any change to the configuration on the SZ-V and on the machine on which the SZ-V is installed.

Regular (periodical) inspection items include the following, in addition to “Daily Inspection” (Section 8.1.1).

Additional inspection items​

  • The SZ-V is installed without losing the screws for fixture, in accordance with the specification of tightening torque in this manual.

  • • The screw on the connector cable is fastened tightly to the SZ-V.

  • The SZ-V does not have any change in its position. (Safety distance is ensured. The detection plane has also not changed.)

  • • All wires are correctly connected to external device, and the connection is securely performed.

  • • There is sufficient life left in terms of how many times the safety relay has been opened and closed.

  • • There is no damage to the SZ-V that may impair the performance of its protective IP65 structure.

  • The surface of the window is not dirty or damaged.