Danfoss VLT FC 280 Operating Manual page 59

VLT® Midi Drive FC 280
Operating Guide
Table 26: STO via Fieldbus
STO command
Inactive
Active
Torque is present only when the drive is running.
1
6.3.1.3 Exit STO
The trigger sources of STO, safe DI and fieldbus, are independent if they are both enabled. To exit STO state, all of the trigger sour-
ces should be turned to inactive:
• STO inactive command received on fieldbus.
• Terminal 37 and 38 are High.
6.3.1.4 Restart Behavior
Even though the drive has exited STO state, the restart behavior of the motor has 2 modes depending on the setting of parameter
42–24 Restart Behavior:
•
If parameter 42–24 Restart Behavior is set to [1] Automatic, the motor can run again just after an On command is received.
• If parameter 42–24 Restart Behavior is set to [0] Manual, the drive needs a Reset action for acknowledgement, and then the motor
can run again after an On command is received.
For manual restart mode, although the motor cannot run before a Reset action after STO state has exited, the motor is no longer
safe! Only safe DI and/or safe fieldbus commands are trustable for the remaining safe state.
6.3.2 Safe Stop 1 Time Controlled (SS1-t)
For SS1-t function, the drive decelerates to 0 speed within a defined deceleration time. Meanwhile, the safety components of the
drive count down the deceleration time and activate STO after the timer expires.
Features of the safety function
• The safety function SS1-t fulfills Safe Stop 1 time controlled in accordance with EN/IEC 61800-5-2, and also corresponds to Stop
category 1 according to EN/IEC 60204-1.
• The drive initiates the motor deceleration and performs STO function after an application-specific time delay.
• The motor becomes torque-free and removes hazardous movements.
STO is activated immediately when the configured stop delay expires, regardless of speed.
Danfoss A/S © 2022.02
Torque
Yes
(1)
No
W A R N I N G
Warning/alarm
None
W68
AQ381425076031en-000101 / 130R1223 | 59
Safety Functions