Safe Torque Off (Sto) - Danfoss iC7 Series Operating Manual

Operating Guide | iC7 Series Functional Safety
2. Select Pair all to pair a single unit or multiple units.
Ü
The pairing view shows the control units and power units connected to a system module.
4.5

Safe Torque Off (STO)

The Safe Torque Off (STO) safety function allows the drive output to be disabled so that the drive cannot generate torque to the motor
shaft.
STO corresponds to an uncontrolled stop in accordance with stop category 0 of IEC 60204-1. The events that can activate the STO
function are:
An external request.
l
A violation of another safety function.
l
A fault detected by the internal diagnostics.
l
The drive always initiates in a safe state, which is cleared automatically after the startup is completed.
When parameter Restart behavior for release of STO is configured to require an acknowledgment, acknowledgment is
l
required also when the device is powered up, and not only when a safety function has been disengaged.
Table 6: STO Parameters
(1)
Parameter name
Activation configuration (A)
Restart behavior for release of
STO (B)
Digital input assignment for
STO restart acknowledge (C)
Triggering edge for STO restart
acknowledge (D)
1) Parameters are identified with letters in the Safety configuration section in MyDrive® Insight. The letter is given in parentheses after the parameter name for each parameter in this
table.
Danfoss Drives Oy © 2024.09
NOTICE
Selections
De-energized (Function always
on)
Safe Input (X33)
Energized (Function always
off )
Direct restart
Nonsafe Acknowledge re-
quired
Safe Acknowledge required
Not selected
Safe Input (X33)
Rising edge
Falling edge
Default value
Safe Input (X33)
Direct restart
Not selected
Rising edge
AQ477043679710en-000102 / 172K2965A |
Parameters for Safety Functions
Description
Specifies the safe digital input,
which can be associated to the
activation of the safety func-
tion.
Specifies the restart behavior
for STO.
Specifies the safe digital input,
which can be associated to the
STO restart acknowledgment.
Specifies the change on the
safe digital input, which is as-
sociated to the STO restart ac-
knowledgment.
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