Acknowledging Faults Using A Fail-Safe Signal - Siemens SINAMICS G120 Function Manual

Alarms, faults and system messages
6.2 Disturbance characteristics of the safety functions
6.2.2

Acknowledging faults using a fail-safe signal

You must acknowledge major safety function faults using a fail-safe signal. There are several
possibilities that allow you to do so, which are described below.
Acknowledging via a fail-safe input
Once you have interconnected an F-DI with an acknowledgement signal, proceed as follows:
● Acknowledge the fault with a falling edge at the F-DI.
● Then, acknowledge the inverter with the "standard" acknowledgement signal.
Acknowledging via PROFIsafe
If you make use of the PROFIsafe telegram, proceed as follows:
● Acknowledge the fault with bit 7 of the control word 0.
● Then, acknowledge the inverter with the "standard" acknowledgement signal.
Acknowledging via Safe Torque Off (STO) and Safe Stop 1 (SS1)
You acknowledge the fault by selecting and deselecting STO (or SS1). This works both via
an F-DI as well as via bit 0 or bit 1 of the PROFIsafe telegram. The procedure is as follows:
● Select the safety function STO (or SS1) and then deselect it.
● Then, acknowledge the inverter with the "standard" acknowledgement signal.
Note
Discrepancy at the input for selecting STO (or SS1)
When you make use of "Extended Safety via F-DI", the following applies:
If the inverter detects a discrepancy on the F-DI that you use to select STO (or SS1), the
inverter deactivates this input. In this case, you will either need to acknowledge the fault
via PROFIsafe or by temporarily shutting off the power supply to the inverter and then
switching it on again.
Other acknowledgement options
You can acknowledge faults by temporarily shutting off the power supply to the inverter and
then switching it on again.
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Safety Integrated Function Manual, SINAMICS G120
Function Manual, 07/2010, FW 4.3.2, A5E03052391B AA