Chapter 5 Operating Instructions

C4000 Standard/Advanced

Subject to change without notice

Installation and mounting

How to calculate the minimum distance D

according to ANSI B11.19:2003@04,

nnex D and Code of Federal Regulations, Volume 29, Part 1910.217 … (h) (9) (v):

he following calculation shows an example calculation of the minimum distance.

Depending on the application and the ambient conditions, a different calculation may be

necessary.

 Calculate D

using the following formula:

× (T

+ T

) + D

Where …

= The minimum distance in inches (or millimetres) from the hazardous point to the

detection point, plan or zone

= A parameter in inches/second or millimetres/second, derived from data on

approach speeds of the body or parts of the body. Often 63 inches/second

(1600 millimetres/second) is used for H

= Stopping time of the machine tool measured at the final control element

= Response time of the control system

= Response time of the presence-sensing device and its interface

= Additional response time allowed for brake monitor to compensate for wear

Any additional time delays must be accounted for in this calculation.

= An additional distance added to the overall minimum distance required. This

value is based on intrusion toward the hazardous point prior to actuation of the

electro-sensitive protective equipment (ESPE). Values range from 0.25 inches to

48 inches (6 to 1220 millimetres) or more depending on application.

Example:

In opto-electronic protection, such as with a perpendicular safety light curtain

applications with object sensitivity (effective resolution) less than 2.5 inches (64

millimetres), the D

can be approximated based on the following formula:

(inches) = 3.4 × (object sensitivity – 0.276), but not less than 0.

Note

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