9
vacon • 122 Safe Torque Off
Local contacts: http://drives.danfoss.com/danfoss-drives/local-contacts/
9.7 Parameters and fault tracing
There are no parameters for the STO function itself.
To re-enable motor operation, after the STO state, it is necessary to perform the following steps:
• Release the switch or the external device (“F30” is displayed even after this has been
released).
• Reset the fault (through a digital input or from the keypad).
• It is possible that a new start command is required for the restart (depending on the applica-
tion and your parameter settings).
9.8 Maintenance and diagnostics
The STO function or the STO input/output terminals do not need any maintenance.
The following table shows faults that may be generated by the software that monitors the hardware
related to the STO safety function. If you detect any failure in safety functions, including STO, contact
your local VACON
®
supplier.
NOTE! See Table 36 for detailed fault code descriptions.
Before testing the STO function, make sure that the checklist (Table 49) is inspected
and completed.
When STO function activates, the drive always generates a fault (“F30”) and the
motor stops by coasting.
In the application the STO state can be indicated using a digital output.
If any service or repair is to be conducted on the drive installed, inspect the checklist
given in Table 49.
During maintenance breaks, or in case of service/repair, ALWAYS make sure that the
STO function is available and fully functional by testing it.
Table 50. Fault related to the STO function.
Fault Code Fault Cause Correction
30
Safe Torque
Off
STO inputs in a differ-
ent state or both de-
energized
Check cabling
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