SAFETY FUNCTIONS OF AREX™ 400
USER MANUAL
103
Example 3
Risk Analysis of a manual loading laser processing machine.
•
Operative cycle: 500 pcs/hour, 1 shift (8h/shift) 250 days /year
•
Dedicated enclosures prevent laser emission during laser processing
•
An interlocked door is dedicated to
part loading
•
Operator are
NOT SKILLED
on laser risks and do
NOT
have
DPI
•
In case of access to marking area, laser is disabled, system is not stopped
LASER RISK ASSESSMENT:
HAZARD, direct scattered laser radiation
•
RISK SEVERITY: SEVERE (irreversible eye damage)
•
RISK FREQUENCY:
FREQUENT
(1/minute)
•
AVOIDANCE PROBABILITY:
NOT POSSIBLE
RISK REDUCTION:
INTELOCKED DOOR
Estimation of PLr for door interlock safety function
•
SEVERITY: SEVERE
S2
•
FREQUENCY: FREQUENT
F2
•
POSSIBILITY OF AVOIDING HAZARD: NOT POSSIBLE
P2
Severity of injury (S)
S1
Slight (normally reversible injury)
S2
Serious (normally irreversible injury or death)
Frequency and/or exposure time to hazard (F)
F1
Seldom to less often and/or exposure time is short
F2
Frequent to continuous and/or exposure time is long
Possibility of avoiding hazard or limiting harm (P)
P1
Possible under specific conditions
P2
Scarcely possible
PLr = PLe
Restart: automatic
Door Switch
Safety Controller
Arex™ 400 SLO - Safety Circuit
Input
Logic
Output
PLr=PLe
