2 - Fagor Automation

9.5 Risk analysis
The machine manufacturer must run a thorough analysis of the possible
risks of the whole system and take the necessary measures to ensure the
safety of the machine as a whole. The residual risk of the machine remaining
after carrying out all the protection measures taken.
Residual risk of AXD/SPD drive
The residual risk regarding the AXD/SPD drive may be prevented if necessary
with additional external measures.
Only a simultaneous failure of two IGBT’s (the top one and the bottom
one of the output stage) can cause the axis to move for an instant ( <
180 electrical degrees). If accessing the machine while stopping is
risky (according to risk analysis), take the necessary measures.
The action of external forces on to the motor (eg. gravity on vertical
axes) causing unwanted movement of the motor can cause a risky situation
if it is possible to access the machine. Take the necessary measures
to ensure protection against a drop.
The unit must always be replaced by another one of the same type.
Otherwise, the parameters will not match the safety configuration and
its performance may be risky.
Functional safety
FUNCTIONAL SAFETY
Risk analysis 9.
DDS
HARDWARE
Ref.1307
319