Danfoss VLT FC Series, Operating Manual, Page: 14 / 26

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4.5 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 or application involving the STO.
For applications without automatic restart after a safe stop, follow the instructions in 4.5.1 Restart Prevention for STO Applica-
tion .
For applications with automatic restart after a safe stop, follow the instructions in 4.5.2 Automatic Restart of STO Application .
4.5.1 Restart Prevention for STO Application
Applications where parameter 5-19 Terminal 37 Safe Stop is set to default value [1] Safe Stop Alarm or combined STO and VLT® PTC
Thermistor Card MCB 112 where parameter 5-19 Terminal 37 Safe Stop is set to [6] PTC 1 & Relay A or [9] PTC 1 & Relay W/A .
Procedure
Remove the 24 V DC voltage supply to terminal 37 using the interrupt device while the drive runs the motor (that is, mains
supply is not interrupted).
Check that:
The motor coasts.
The mechanical brake activates (if connected).
The LCP (if mounted) shows
Alarm 68, Safe Stop .
Reapply 24 V DC to terminal 37.
Ensure that the motor remains in the coasted state, and that the mechanical brake (if connected) remains activated.
Send a reset signal via bus, digital I/O, or [Reset] key.
Ensure that the motor is operational again.
When all given steps are passed, the commissioning test is successfully completed.
4.5.2 Automatic Restart of STO Application
Applications where parameter 5-19 Terminal 37 Safe Stop is set to [3] Safe Stop Warning or combined STO and VLT® PTC Thermistor
Card MCB 112 where parameter 5-19 Terminal 37 Safe Stop is set to [7] PTC 1 & Relay W or [8] PTC 1 & Relay A/W .
Procedure
Remove 24 V DC voltage supply to terminal 37 by the interrupt device while the drive runs the motor (that is, mains supply
is not interrupted).
Check that:
The motor coasts.
The mechanical brake activates (if connected).
The LCP (if mounted) shows
Warning 68, Safe Stop .
Reapply 24 V DC to terminal 37.
Ensure that the motor is operational again.
When all the given steps are passed, the commissioning test is successfully completed.
N O T I C E
See the warning on the restart behavior in 2.5 Safety Precautions .
4.6 System Configuration Security
Security measures are the responsibility of the user.
The drive parameters can be password-protected.
4.7 Service and Maintenance
It is required for PL d or SIL2 to conduct a functional test every 12 months to detect any failure or malfunction of the STO functional-
ity. For lower PL or SIL, it is a recommendation.
AQ313340186453en-00101 / 130R0544 14 | Danfoss A/S © 2021.03
Commissioning
Safe Torque Off
Operating Guide