I have a problem with interpreting the functional safety diagram of a servo motor driver. It has a long manual here but I will present the parts I'm stuck at. The minimum basic requirement for safety is given below with following diagram (from page 186):
As you see above on the right side, there is a section with X8 which is I/O Connection and at page 144 there are definitions of these pins for X8. X8/1 and X8/2 are fault relay output; X8/3 is common and X8/4 is output enable. At page 158 there is an extra information about X8/1 and X8/2 but it is not clear to me. Here is what is given:
What I understand from this diagram is that if a fault occurs and if X8/3 is enabled then X8/1 and X8/2 will act just as a switch and send 24V to a relay K1 where relay's DC ground G is connected to 24V DC power supply ground. At page 34 there is this rating:
Below I tried to draw my own interpretation of this diagram wiring. Please see my below drawing:
1-) Is my understanding of the mechanism correct?
2-) What does "Power ON" switch next to the K1 represent in the original diagram?
3-) How should I interpret relay output ratings above: 30V DC 1A and 42V AC 1A? Are they the ratings for the relay K1?
4-) The datasheet does not mention in which conditions "Fault Relay" de-activates. Does that mean it de-activates when there is significant amount of current passing through earth? "(terminals X8/1 and X8/2 ) is signaled by a floating relay contact" What do they mean by floating relay contact here? Is that the relay inside the driver?