Lazer Safe PCSS-A Series Technical Manual page 105

LS-CS-M-046
10.4 Light Guard Systems
This section describes the options available for using OEM light guards (such as light
curtains) with the PCSS-A. These may be used on their own, or in conjunction with Lazer
Safe guarding systems.
A light guard uses a protective light barrier that will signal the PCSS-A (via OSSD outputs)
when the light barrier is obstructed. The time taken for the press brake to stop is monitored
by the PCSS-A.
Note:
Any safety device used as a guard system must meet the safety requirements
of the standards as stated in
curtain or laser beams.
When using Light Guard Type 1, 2 or 3, there are three parameters that must be set in the
PCSS-A to determine if the monitored stopping distance is within safe limits, to prevent
accident and injury.
These parameters are defined in EN12622, Safety of machine tools – Hydraulic press
brakes, Annex A (normative), Calculation of minimum safety distances. The values can
be determined from the light guard manufacturer's specifications, and the site installation
distances.
•
Light guard safety distance (ANO, channel 20). The minimum distance in microns,
from the danger zone to the detection point, line, plane or zone not less than 100mm
with a detection capability equal to or less than 14mm.
•
Light guard response time (ANO, channel 21). The maximum response time in
milliseconds, of the light guarding system.
•
Light guard resolution (ANO, channel 22). The minimum detection capability in
microns, of the light guarding system.
All of these parameters must have non-zero values for the variables in the ISaGRAF kernel
interface.
10.4.1
This option is selected when a light guard system is not being used as part of the guarding
option on the press brake.
To select the No Light Guard option, the Light Guard Code 0 should be used to determine
the guard option value for calculating the CNC/Counting/Guarding option variable as
described in
initialised when the PCSS software is started.
10.4.2
Light Guard Type 1 configures the PCSS-A to work with a light guard that has an external
functional test input. This is used to periodically simulate an obstruction by turning off the light
guard transmitter, thereby testing the operation of the light guard transmitter, receiver, and
the OSSD signals.
Depending on the light guard device being used, this option may have to be selected,
although this is not mandatory as most of the light guards which meet the safety requirements
of the standards (as stated in
test input.
Refer to the light guard's installation instruction to determine if this option is required by the
manufacturer.
To select the Light Guard Type 1 option during the PCSS configuration, the Light Guard Code
4 should be used to determine the guard option value for calculating the
CNC/Counting/Guarding option selection variable value as described in
Original Language Version: 1.25
No Light Guard (Code 0)
Section 10.5. This will ensure that this option and the functionality required are
Light Guard Type 1 (Code 4)
Table 2-1)
irrespective of the technology – light
Table 2-1
are not equipped with, and do not require an external
PCSS-A Series Technical Manual
Section 10.5.
Page 85
Released: 12/09/2024