The light curtain monitors its internal circuitry and its ossd ou tputs for faults.
Light curtain muting circuit.
Safety light curtains reliably and cost effectively protect against access into hazardous points and areas.
The terms muting and blanking are frequently used incorrectly.
The timer monitoring the 4 seconds shall be a safety related item.
Also the status output for the mute light changes to green.
In normal operation if a light curtain detects an object it causes the safety system to stop any hazardous motion in the hazardous area.
The light curtain s ossd outputs turn on once its field of view is no longer interrupted.
From the instant the first of the two muting sensors is cleared.
Muting light curtain monitoring relays allow the automatic temporary suspension of the safety function if certain conditions are met.
It sounds easy but configuring a muting circuit appropriately.
After 3 seconds the status output and mute function turn off.
Depending on the variant different machine functions are integrated or can be selected via safe control solutions.
First we test the safety light curtain and latch reset with mute off.
29 cfr 1910 217 c 3 iii d the safety distance d s from the sensing field to the point of operation must be greater than the distance determined by the safety distance formula.
In material handling applications material is allowed to pass through the protective field without shutting down the machine.
When enabled a function block is purple with a 3 second count down timer.
Next lets test the mute function.
Safety light curtains can be used in a variety of different modes such as muting blanking and floating blanking depending on the needs of the application.
When a fault in the internal circuitry or an output is detected the light curtain responds by turning off its ossd outputs.
Light curtain with muting two sensor l type and configurable safety relay introduction light curtains are used to detect attempted access to a hazardous area.
The muting circuit for the light curtain must also be appropriately configured for the discrete item s transition speed so that the curtain doesn t remain in a deactivated state.
This post will help clarify the difference between the two so the correct safety light curtain functionality is chosen and the machine runs safely.
Muting sensors shall be positioned beyond the light curtain in the dangerous area.
Muting or bypassing of the psd during the upstroke of the press slide is permitted for parts ejection circuit checking and feeding.
