Vacon OPTAF - Page 41

THERMISTOR FUNCTION (ATEX) vacon • 39
Local contacts: https://www.danfoss.com/en/contact-us/contacts-list/
Figure 16. Thermistor function principle in VACON
®
NXP AC drive with the OPTAF board
SD1+
+
SD1-
SD2+
SD2-
-
RO1/3
RO1/1
RO1/2
RO2/3
RO2/2
NXP CONTROL UNIT
Control board
OPTAF board, slot B
POWER UNIT
Thermistor
Atex Safety
Function
Relays only for operational use,
not part of the ATEX certified thermistor
function
M
=
3~
Hardware
STO 1
PWM
control
Hardware
STO 2
PWM
control
Control
logic
11068.eps