Functional safety
328
9.
FUNCTIONAL SAFETY
Response time of the safety functions
Ref.1912
DDS
HARDWARE
· 322 ·
9.8 Response time of the safety functions
Response time of the safety functions of the machine
The standard EN ISO 13849-1 requires the machine safety manual to report
the response time of the safety functions implemented in the machine. These
measurements must be taken from the instant the danger condition takes
place (e.g. door opened) to the instant the safety function is executed (e.g.
machine stopped). This time will depend on the design of the machine's safety
control circuit.
Response time of the safety functions of the drive
The table below provides the response times of the safety functions of the
AXD/SPD.
Actual response time of the holding brake
Consider that the actual response time of the holding brake is the sum of the
response time of its control and the response time of the brake itself which
for FAGOR brakes varies between 5 and 30 ms.
T. H9/3 Response time of the safety functions of the AXD/SPD.
time Comment
STO:
- KM1
external
channel
Depends
on used
- KM1
contactor
Measurement taken with a Schneider
contactor. The system delay between the
actual opening of the contacts and the “Torque
Off” is less than 35 ms.
STO:
Drive Enable
integrated
channel
< 15 ms
Measurement taken in a circuit equivalent to
that of figure
F. H9/2 with a external safety
controller for emergency stop from
Telemecanique. The delay of the internal circuit
is less than 15 ms.
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