Vacon optbj - Page 31

Commissioning vacon • 31
Local contacts: https://www.danfoss.com/en/contact-us/contacts-list/
6
Figure 14. Structure of cable with two individually shielded twisted pairs
X = Not recommended due to causes of electromagnetic disturbances, safety actuator configuration or behavior
in failure situations.
Table 9. Recommended maximum cable lengths
Safety actuator type
Diagnostics on safety
actuator
Cable type
Used STO input connection
STO
connection
example 1
STO
connection
example 2
STO
connection
example 3
Undiagnosed safety actuator
(i.e. emergency stop button or
relay contact)
No diagnostics
Shielded X 200 m 200 m
Unshielded X 30 m X
Safety actuator with diagnosed
outputs (i.e. safety PLC)
Outputs diagnosed using
e.g. dark test pulse,
light test pulse not used
Shielded 200 m 200 m 200 m
Unshielded 30 m 30 m X
Outputs diagnosed using
light test pulse
Shielded 200 m X X
Unshielded 30 m X X
Individual pair Overall shield
(Optional)
Pair shield
Cable jacket
11860_uk