Appendix
A.3 Application examples for functional safety (STO / SS1-t)
Power Module PM330
Hardware Installation Manual, 12/2018, A5E32844552B AF
127
Activate the STO circuit, bring both activation switches S41 towards the front.
-2:
-down time (parameter p1135) must be set for SS1-
-down time with the SS1-t delay time
If necessary, use a braking chopper to shorten the braking ramp.
In this case, a risk assessment of the system/machine is required.
Setting/adjusting the switch of the 3SK1 depends on the system/machine
as well as the requirements, for example as derived from the risk
assessment
Select the required 3SK112-xCB4y, 3SK1121 safety relays have different
time ranges.
– y = 1 -> adjustable time range, 0.05 to 3 s
– y = 2 -> adjustable time range, 0.5 to 30 s
– y = 4 -> adjustable time range, 5 to 300 s
– Adjusting the required delay time for SS1-t.
This time defines the delay between the activation of SS1-t and when
the actual STO safety function is initiated.
As a consequence, this time also defines how long the non-safe OFF3
function can actively brake along the ramp before the torque is
shutdown - and the motor starts to coast down.
Current standards, directives and requirements relating to your specific
application must be carefully taken into consideration here.
Notice: An excessively long delay time means that the drive is in a non-
safe state for an unnecessarily long time.
Display
Display in IOP or STARTER:
In IOP / STARTER, parameter r0002 is used as "Drive operating display".
Enable and inhibit signals as well as operating states are displayed here, e.g.:
● r0002 = [44] Switching on inhibited – connect 24 V to terminal STO (hardware)
– STO active in one or both STO channels
● r0002 = [31] Ready for switching on – set "ON/OFF1" = "1/0" (p0840)
– Drive is ready to switch on, the start signal is still missing
– An STO is not available at any STO input-> STO_A and STO_B have a 1 signal
The 3SK1121 has 2 LEDs to display the operating state, see the 3SK1121 documentation.
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