How do you calculate the safe distance for light curtains?
ddt = 3.4 x (de – 7) mm Therefore, a light curtain with 14 mm resolution (finger detection) has a ddt of 23.8 mm (about an inch). Meanwhile, a light curtain with 30 mm resolution (hand detection) has a ddt of 78.2 mm (about 3 inches).
What is the formula for determining safety distance for light curtain placement on a power press with a part revolution clutch?
Presses » Safety Distance
- Safety Distance (Ds) Ds = 63 inches/second x Ts where:
- Safety Distance(Dm) Dm = 63 inches / second x Tm where:
- ANSI Minimum Safety Distance (Ds)
What is the safety standards for safety light curtain?
Light curtains must comply with IEC-61496 parts 1 & 2 adopted as ANSI/UL 61496 parts 1 & 2. Light curtains’ “TYPE” (i.e., their Safety Performance Level) must be appropriately selected. Light curtains’ optional functions, as listed in Annex “A” of IEC-61496 part 1, must comply with Annex “A” requirements.
What is light curtain resolution?
A light screen’s resolution is equal to one beam diameter plus the spacing between adjacent beams. This ensures an object of that size cross-section or larger will always be detected and issued a stop command.
How do you calculate safe distance?
Here is the equation for creating a safe minimum mounting distance: Ds = [K x (Ts + Tc + Tr)] + Dpf as defined by the American National Standards Institute (ANSI). Dpf = maximum travel towards the hazard within the presence sensing safeguarding devices (PSSD) field that may occur before a stop is signaled.
What is the safety distance between cars?
three-second
The three-second rule is recommended for passenger vehicles during ideal road and weather conditions. Slow down and increase your following distance even more during adverse weather conditions or when visibility is reduced. Also increase your following distance if you are driving a larger vehicle or towing a trailer.
What is the difference between Type 2 and Type 4 light curtains?
Type 4 light curtains have EAA of ±2.5 degrees, whereas Type 2 light curtains have the wider angle of ±5 degrees. With this wider EAA, Type 2 light curtains are ultimately more likely to experience an optical short circuit.
How do you reset light curtains?
With manual reset, the operator must press a reset button when the guarded area is clear. This is useful with large protective areas. The operator can pass through the light curtain and be inside the protected area. When he exits the area, he resets the safety light curtain.
What is the meaning of minimum object sensitivity in a light curtain system?
Minimum Object Sensitivity: Minimum object sensitivity refers to the smallest object (diameter) that the light curtain can detect.
What is light curtain muting?
System Overview. Muting is the temporary, automatic suspension of the protective function of a safeguarding device like a light curtain. Muting lets materials travel through the light curtain without stopping the hazardous motion.
What is distance guard?
Fixed distance guard – a fixed guard that does not completely enclose the hazard but that prevents or reduces access because of its physical dimensions and its distance from the hazard.