The safety light curtain can be connected to the UE48-2OS switching amplifiers. It is
oper
ated with restart interlock and external device monitoring.
Functionality
When the protective field is clear, the OSSD1 and OSSD2 outputs carry voltage. The
system can be switched on when K1 and K2 are in the de-energized position. Pressing
the S1 button switches on the UE48 switching amplifier. Contacts 13-14 and 23-24 of
the UE48 activate the K1 and K2 contactors.
When the protective field is interrupted, the OSSD1 and OSSD2 outputs carry no volt‐
age. The UE48 switches off and K1, K2 are deactivated.
Fault analysis
Failure of K1 and K2 does not cause the loss of the shut-down function. Cross-circuits
and short-circuits of the OSSD1 and OSSD2 outputs are recognized and lead to the
locking state. It is recognized if the K1 or K2 contactors do not de-energize.
4.5 Testing plan
The manufacturer of the machine and the operating entity must define all required
c
hecks. The definition must be based on the application conditions and the risk assess‐
ment and must be documented in a traceable manner.
b
When defining the check, please note the following:
°
Define the type and execution of the check.
°
Define the frequency of the check.
°
Notify the machine operators of the check and instruct them accordingly.
The following checks are often defined in connection with a protective device:
•
Check during commissioning and modifications
•
Regular thorough check
Check during commissioning and modifications
The check must detect if it is possible to enter the hazardous area without being
detected.
The following points are often helpful for the definition of the check:
•
Does the check have to be completed by quality safety personnel?
•
Can the check be completed by personnel specially qualified and authorized per‐
sonnel?
•
Does the check have to be documented in a traceable manner?
•
Can the check be carried out according to a check list? (see "Checklist for initial
commissioning and commissioning", page 75)
•
Do the machine operators know the function of the protective device?
•
Have the machine operators been trained to work on the machine?
•
Have the machine operators been notified about modifications on the machine?
•
Does the hazardous area to be secured have to be checked with a test rod? (see
"Test rod check", page 28)
b
Define all guidelines for the check.
Regular thorough check
T
he check must detect if it is possible to enter the hazardous area without being
detected. Such possibilities may exist due to modifications, manipulations or external
influences.
The following points are often helpful for the definition of the check:
•
Which check must be carried out and how is it carried out?
PROJECT PLANNING 4
8014253/ZOH3/2017-08-04 | SICK O P E R A T I N G I N S T R U C T I O N S | deTec4 Core
27
Subject to change without notice
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