When the protective field is clear, the OSSD1 and OSSD2 outputs carry voltage.
T
he system can be switched on when K1 and K2 are in a fault-free de-ener‐
gized position. Lamp H2 flashes. The RLY3-OSSD2 is switched on by pressing S1
(pushbutton is pressed and released). The outputs (contacts 13–14 and 23–24)
switch the K1 and K2 contactors on. When the protective field is interrupted, the
OSSD1 and OSSD2 outputs switch the RLY3-OSSD2 off. Contactors K1 and K2 are
switched off.
•
Mut
ing and override
Muting starts when the protective field is clear and valid muting input conditions
appl
y. Muting lamp H1 signals the muting status. If a fault occurs when the
protective field is interrupted and at least one muting sensor is active, the safety
light curtain must be in the override status. Pressing key-operated pushbutton S2
(pressing and releasing) initiates the override status.
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.
In addition, the device must be checked for correct functioning after each change to the
configuration and each insertion of the system plug.
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
T
he test is intended to ensure that the hazardous area is monitored by the protective
device and any attempted access to the hazardous area is prevented.
The following points are often helpful for the definition of the check:
•
Does the check have to be completed by qualified safety personnel?
•
Can the check be completed by specially qualified and authorized personnel?
•
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 151)
•
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 being secured have to be checked with a test rod? (see
"Test rod check", page 63)
b
Define all guidelines for the check.
Regular thorough check
T
he test is intended to ensure that the hazardous area is monitored by the protective
device and any attempted access to the hazardous area is prevented.
The following points are often helpful for the definition of the check:
•
Which check must be carried out and how is it carried out?
°
Test rod check, page 63
°
Visual check of the machine and the protective device, page 65
4 P
ROJECT PLANNING
62
O P E R A T I N G I N S T R U C T I O N S | deTec4 Ex II 3GD 8023872/18YZ/2021-01-14 | SICK
Subject to change without notice
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