Danfoss VLT FC 280 Operating Manual page 58

VLT® Midi Drive FC 280
Operating Guide
f
A
1
Illustration 31: Safe Torque Off
A Actual frequency
1 Activation of Safe Torque Off
6.3.1.1 STO Triggered by DI
To enable safe DI as STO input, set parameter 42-20 Safe Function as [0] STO. The following table shows STO statuses based on
whether terminals 37 and 38 are energized.
Table 25: STO via DI
Terminal 37
High
(1)
Low
(3)
Low
High
Voltage range is 24 V±15%, with terminal 39 as reference.
1
Torque is present only when the drive is running.
2
Open circuit or the voltage is within the range of 0 V ±1.5 V, with terminal 39 as reference.
3
6.3.1.2 STO Triggered by Fieldbus
To enable safety fieldbus protocol, set parameter 42-60 Telegram Selection to [1] PROFIsafe Std. Tel. 30. STO control command is sent
from the upper device continuously and periodically. The command includes:
• STO inactive
• STO active
58 | Danfoss A/S © 2022.02
t
2
Terminal 38
High
Low
High
Low
2 Motor standstill
Torque Warning/alarm
Yes None
(2)
No W68
No W252
No W252
AQ381425076031en-000101 / 130R1223
Safety Functions