6
vacon • 36 Commissioning
Local contacts: https://www.danfoss.com/en/contact-us/contacts-list/
6.3 Parameterization of STO functionality
STO functionality is based on hardware, and cannot be bypassed by parameterization. Activating ei-
ther or both of STO input channels by applying logical '0' causes a coasting stop for the motor and
prevents the restart. The additional actions such as generating fault or alarm from STO activation
or driving the STO state to an output can be parameterized. See application manual for the related
parameters.
Table 10. Parameter description for STO fault parameter
Index Parameter Min Max Default ID Description
P3.9.1.14
(INDUS-
TRIAL /
FLOW)
STO Fault No Action
Fault,
Coast
Fault,
Coast
775
• No Action: Activating STO causes
motor to stop by coasting and 'Not
ready' state. Drive returns to
'Ready' state as soon as STO is
deactivated. No indication of STO
activation is displayed.
• Alarm: Activating STO causes
motor to stop by coasting and 'Not
ready' state. Alarm is displayed,
but drive returns to 'Ready' state
as soon as STO is deactivated.
• Fault, Coast: Activating STO
causes motor to stop by coasting
and 'Fault' state. STO needs to be
deactivated and fault reset before
drive returns to 'Ready' state.
P3.9.29
(HVAC)
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