•
•
1.
2.
-
1.11.3 STO Commissioning
1.11.3.1 Activation of Safe Torque Off
To activate the STO function, remove the voltage at terminals 37 and 38 of the drive.
When STO is activated, the drive issues
alarm 68, Safe Torque Off
or
warning 68, Safe Torque Off
, trips the unit, and coasts the motor
to stop. Use the STO function to stop the drive in emergency stop situations. In normal operating mode when STO is not required,
use the standard stop function instead.
N O T I C E
If STO is activated while the drive issues
warning 8, DC undervoltage
or
alarm 8, DC undervoltage
, the drive skips
alarm 68, Safe
Torque Off
, but the STO operation is not affected.
1.11.3.2 Deactivation of Safe Torque Off
Follow the instructions in the following table to deactivate the STO function and resume normal operation based on the restart
mode of the STO function.
W A R N I N G
RISK OF INJURY OR DEATH
Reapplying 24 V DC supply to either terminal 37 or 38 terminates the SIL2 STO state, potentially starting the motor. Unexpected
motor start may cause personal injuries or death.
Ensure that all safety measures are taken before reapplying 24 V DC supply to terminals 37 and 38.
Table 3: STO Deactivation
Restart mode
Steps to deactivate STO and resume normal operation
Restart mode configuration
Manual restart
Step 1: reapply 24 V DC supply to terminals 37 and 38.
Step 2: initiate a reset signal (via fieldbus, digital I/O, or [Re-
set]/[Off Reset] key on the LCP).
Default setting.
Parameter 5-19 Terminal
37/38 Safe Torque Off
=
[1] Safe Torque Off
Alarm
.
Automatic restart Reapply 24 V DC supply to terminals 37 and 38.
Parameter 5-19 Terminal 37/38 Safe Torque
Off
=
[3] Safe Torque Off Warning
.
1.11.4 STO Commissioning Test
After installation and before first operation, perform a commissioning test of the installation using STO. Perform the test again after
each modification of the installation or application involving the STO.
N O T I C E
A successful commissioning test of the STO function is required after the initial installation, and after each subsequent change to
the installation.
To perform a commissioning test:
1.1.11.4.1 Test for STO Applications in Manual Restart Mode
if STO is set to manual restart mode.
1.1.11.4.2 Test for STO Applications in Automatic Restart Mode
if STO is set to automatic restart mode.
1.11.4.1 Test for STO Applications in Manual Restart Mode
For applications where
parameter 5-19 Terminal 37/38 Safe Torque Off
is set to the default value
[1] Safe Torque Off Alarm
, conduct the
commissioning test as follows:
Procedure
Set
parameter 5-40 Function Relay
to
[190] Safe Function active
.
Remove the 24 V DC voltage supply to terminals 37 and 38 using the safety device while the drive drives the motor (that is,
the mains supply is not interrupted).
AN41533976851001-000101 /
130R1264
1
0
| Danfoss A/S © 2022.06
VLT® Midi Drive FC 280
English
