Metronix ARS 2320, Руководство по эксплуатации продукта

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Functional safety technology Page 66
Product Manual „Servo drives ARS 2320, ARS 2340, ARS 2320W, ARS 2360W“ Version 8.0
6 Functional safety technology
6.1 General, intended use
The ARS 2000 servo drives support the safety function “unexpected start-up” and “switch to
powerless” as required by standard EN ISO 13849-1, Category 3 Performance Level d.
Statistical Data:
 Channel 1, switch off the PWM signal via X1: MTTFd = 714,81 years

Channel 2, switch off the power supply via X3: MTTFd = 304,7 years
 PFH value: PFH = 8,63 • 10
-8
/h
According to the standard mentioned above, the MTTFd values are limited to 100 years.
Notes:
 The characteristic values are valid only at use as agreed after product manual

These are calculated values which represent the probabilities of failure. They do not
guarantee any particular product lifecycle

According to EN ISO 13849-1: 2008-12, section “C.5 MTTFd data of electrical components”
can be accepted that only 50% of the failures lead to dangerous failures
The standstill of the machine has to be initiated and ensured by the control system of the machine.
This applies particularly to vertical axes without self-locking mechanism or weight compensation.
Generally, for vertical axes further safety precautions have to be taken.
In accordance with a danger analysis / risk assessment following the machinery directives 2006/42/EG
and the appropriate standardize respectively, the machine manufacturer has to plan the safety system
for the entire machine whilst taking into account all components integrated. Among these are also
electric drives. The requirement at controls, that is the Performance Level which can be selected
results from the risk height.
The “Safe Torque-Off (STO)” function will not cause an electrical isolation. It therefore provides no
protection against electric shock. It is thus impossible to achieve an EMERGENCY OFF installation in
the normative sense by using the “Safe Torque-Off (STO)” function, because in order to do so, the
entire system would have to be shut down via the power switch (main switch or power contactor).