Vacon OPTAF - Page 18

vacon • 16 STO AND SS1 SAFETY FUNCTIONS
Local contacts: https://www.danfoss.com/en/contact-us/contacts-list/
Figure 4.STO safety function principle in VACON
®
NXP AC drive with the OPTAF board, FR9-FR14
SD1+
+
SD1-
SD2+
SD2-
-
RO1/3
RO1/1
RO1/2
RO2/3
RO2/2
M
=
3~
NXP CONTROL UNIT
Control board
OPTAF board, slot B
Control
logic
POWER UNIT
Hardware
STO 1
PWM control
Thermistor
Hardware
STO 2
Atex Safety
Function
Relays only for operational use,
not part of the safety functions
11970_uk.eps
Enable
Power
unit
logic
Hardware
STO 1
Hardware
STO 2
PWM control