Smartscan Safety Light Curtain: 8K3 Series 'L' Light Curtain System Simulation
To ensure correct operation of the safety system both mute beams must be blocked by a loaded pallet within 1.7 seconds of each other and both must remained blocked during the entire period the palletized load is transferring through the light curtain.
Once both cross beams are blocked (and remained blocked) the system is muted and will remain muted until the cross beams are cleared and the mute enable signal is applied.
There is a short period of time when the trailing edge of the pallet load 'clears' the detection field of both mute sensors but is still blocking the vertical light curtain. A timer is incorporated within the safety control system that allows a period of 2 seconds (Mute Delay Off timer = ON) between the pallet load 'Clearing' the mute sensors and 'Clearing the vertical light curtain. If the 2 second period is exceeded the safety system will trip
.
*Note: The mute delay off timer must be applied for the muting sequence to behave properly else system will trip when product is exiting the safeguarded area.
Position the light curtain to ensure that the pallet load does not stop after clearing the mute beams yet still block the vertical light curtain.
For increased safety integrity a third mute input is available at the light curtain safety controller. This 3rd signal is normally taken from the conveyor transport system (mute enable). Inclusion of this signal indicates to the safety control that the conveyor is transferring products towards the light curtain detection field, thus instructing the controller to activate a MUTE ON condition during the pallets transfer through the light curtain.
Once both cross beams are blocked (and remained blocked) the system is muted and will remain muted until the cross beams are cleared and the mute enable signal is applied.
There is a short period of time when the trailing edge of the pallet load 'clears' the detection field of both mute sensors but is still blocking the vertical light curtain. A timer is incorporated within the safety control system that allows a period of 2 seconds (Mute Delay Off timer = ON) between the pallet load 'Clearing' the mute sensors and 'Clearing the vertical light curtain. If the 2 second period is exceeded the safety system will trip
.
*Note: The mute delay off timer must be applied for the muting sequence to behave properly else system will trip when product is exiting the safeguarded area.
Position the light curtain to ensure that the pallet load does not stop after clearing the mute beams yet still block the vertical light curtain.
For increased safety integrity a third mute input is available at the light curtain safety controller. This 3rd signal is normally taken from the conveyor transport system (mute enable). Inclusion of this signal indicates to the safety control that the conveyor is transferring products towards the light curtain detection field, thus instructing the controller to activate a MUTE ON condition during the pallets transfer through the light curtain.
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L Style Cross-Beam Muting Process
STAGE 1: The product approaches the cross-beam sensors of the L type light curtain from the danger area.
STAGE 2: Once the product blocks both of the cross-beams, the light curtain goes into the mute mode. The light curtain will remain muted as long as the product is blocking the sensing unit and the mute enable signal is applied.
STAGE 3: One the product clears the sensing unit the L type light curtains safety function of the light curtain will reactivate nearly simultaneously.
STAGE 1: The product approaches the cross-beam sensors of the L type light curtain from the danger area.
STAGE 2: Once the product blocks both of the cross-beams, the light curtain goes into the mute mode. The light curtain will remain muted as long as the product is blocking the sensing unit and the mute enable signal is applied.
STAGE 3: One the product clears the sensing unit the L type light curtains safety function of the light curtain will reactivate nearly simultaneously.