Safe State; Internal And External Fault; Fault Reaction - Danfoss VLT FC 280 Operating Manual

Operating Guide | VLT® Midi Drive FC 280
Safety components are already mounted within the drive. Disassembling any part of the drive is not allowed.
If both safety digital input and safety fieldbus are enabled, STO or SS1-t can be triggered via both sources. STO has the highest priority.
SS1-t can be interrupted by STO from any trigger source.
Table 23: Safety Functions Combination in Drive
FC 280
Parameter 42-20 Safety
Function T37/T38
1) * means default value.
2) Via fieldbus only.
3) Via digital input only.
4) Via both trigger sources.

Safe State

6.2.2
The safe state of the drive is STO achieved or power off.
6.2.3

Internal and External Fault

Internal fault
The diagnosis mechanism of the drive detects the internal fault inside the drive.
Normally, an internal fault is caused by:
EMI.
l
Random failure of components.
l
Harsh environment condition.
l
Other systematic errors.
l
When an internal fault is detected, the drive reports an alarm and switches to the safe state. To reset the drive, clear the alarm or recycle
the power supply, see 6.8 Reset Function
External fault
External fault is the fault caused by invalid external input which includes:
Discrepancy on safety digital input.
l
Safety fieldbus communication errors.
l
Fieldbus master, for example, a PLC, forces the drive into safe state.
l

Fault Reaction

6.2.4
When an internal fault is detected, the fault reaction is STO. When an external fault happens, the fault reaction can be defined via setting
parameter 42-30 External Failure Reaction to STO or SS1-t.
Assess the risk before using SS1-t as external failure reaction.
60 | Danfoss A/S © 2024.10
NOTICE
(1)
Disabled*
STO
SS1-t
for details.
Parameter 42-60 Telegram Selection
(1)
None*
No safety function
(3)
STO
(3)
SS1-t
CAUTION
Safety Functions
PROFIsafe Std. Tel. 30
(2) (2)
STO and SS1-t
(4) (2)
STO and SS1-t
(4) (2)
SS1-t and STO
AQ381425076031en-000201 / 130R1223