Safe Torque Off (STO) with PSD1
78 (109) 192-011006N8 2019-07 09.10.19 09:27
6.7 STO function test
The STO function must be checked in the event of:
• Commissioning
• After each exchange of any equipment within the system
• After each intervention into the system wiring
• In defined maintenance intervals (at least once per week) and after a longer
standstill of the machine
If the STO function was triggered by opening a protective door and if this door is
opened several times a week, the weekly testing interval is not required.
The check must be made by qualified personnel adhering to all necessary safety
precautions.
The following testing steps must be performed:
Expected reaction and effect
Connect terminal X17.12* and X17.16*
Apply 0 VDC voltage to terminal X17.14*
Switch on supply power and 24 VDC supply
voltage
Testing active STO on terminal X17.12 and
X17.16:
Simultaneous removing of 24 VDC on terminal
X17.12 and X17.16*
Active STO must be displayed via
LED or fieldbus.**
No error must be present if object
STO_Setup=0.
Error message 0x5492 if object
Apply again 24 VDC voltage to terminal X17.12
and X17.16 and acknowledge STO afterwards*
No error must be present; torque
at the motor should be present.
Then switch off and on again 24 VDC voltage
supply.
* The same test with terminals X21.12 & X21.16 & X21.14 is necessary for two or
three axis controllers.
** With two or three axis controllers STO status for all motors should apply.
A manual check of the torqueless drive is here also sufficient.
The triggering of the STO can also be made by actuating the emergency stop
switch. During the automated test, the STO can also be triggered via the contacts
of an external relay
Following the test steps
Once all of the relevant safety test steps have been accomplished, the actions
taken must be documented. A protocol specimen can be found in the following
section.
Depending on the machine version, additional or other test steps may be required.
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