Danfoss VLT FC 280 Operating Manual page 57

VLT® Midi Drive FC 280
Operating Guide
When safe function is achieved by the safe digital input (terminal 37 and 38), the reset action to restart the motor depends on the
configuration of restart behavior. Parameter 42-24 Restart Behavior determines whether the drive restarts automatically or waits for a
manual reset after the safety function is achieved.
• Automatic reset: when the safety function is achieved, the safety option can run again when the condition that triggered the
safety function ceases. This behavior is only valid for the digital input where this reset behavior is defined. For example, if there
is an external fault, a manual reset from the reset source is required regardless of the setting in parameter 42-24 Restart Behavior.
• Manual reset: when the safety function is achieved, the drive requires a reset from a reset source before it can run again. The
reset source could be the following (refer to
Source and its options):
-
The Reset key on the LCP.
- A specified non-safe digital input.
- The reset command via fieldbus other than PROFIsafe (for example RS485, PROFINET).
Restart behavior of safe fieldbus
Make sure that the surrounding environment is safe before recovering from safe state.
The drive resets automatically when inactive command received from the host device via safety fieldbus protocol.
6.2.5.2 Recovery from Safety Events
Table 24: Recovery from Safety Events
Safety event Safety event
index
1 Customization aborted
2 Customization completed
3 General reset
4 Internal failures
5 External failures
6 SO initialized (power up without failure)
7 Safe function pending
6.3 Safety Functions
6.3.1 Safe Torque Off (STO)
Safe Torque Off (STO) prevents the drive from generating the energy that is required to rotate the motor, thus ensures the safety of
the system in emergency situations.
The STO function in the drive is controlled via redundant safety digital input (terminals 37 and 38) or/and safety fieldbus. When STO
is activated, the power supply on the high side and low side of the IGBT gate driving circuits is cut off. The following illustration
shows the STO architecture.
Danfoss A/S © 2022.02
6.12 Safety-related Parameters
N O T I C E
User action required when safe
fieldbus is disabled
Manual reset
Manual reset
Manual reset
Power cycle
Manual reset
Manual reset
Manual reset
for more information on parameter 42-31 Reset
User action required when
safe fieldbus is enabled
–
–
–
Power cycle
Manual reset
–
Manual reset
AQ381425076031en-000101 / 130R1223 | 57
Safety Functions