STO AND SS1 SAFETY FUNCTIONS vacon • 25
Local contacts: https://www.danfoss.com/en/contact-us/contacts-list/
3.4.2 Example 2: OPTAF board with reset for Safe Torque Off (STO) or EN
60204-1 stop category 0
Figure 9. Example 2.
Figure 9 presents a connection example of OPTAF board for STO safety function with reset. The
switch S1 is connected with 4 wires to the OPTAF board as shown above. The digital input 3 (DIN3),
for example, is wired for the fault reset function. The reset function can be programmed to any of
the available digital inputs. The drive must be programmed to generate a fault in STO state.
The power supply to S1 may come from OPT-A1 board (connector pins 6 & 7 in Figure 8) or it may
also be external.
When the switch S1 is activated (contacts open), the drive will go to STO state and motor (if running)
will stop by coasting. The drive will indicate: "F30 SafeTorqueOff".
To start the motor operation again, following sequence is performed.
• Release switch S1 (contacts closed). The hardware is now enabled but the drive continues to
display the fault "F30 SafeTorqueOff".
• Acknowledge the releasing of switch by edge sensitive reset function. The drive returns to
the ready state.
• Giving a valid start command will start running the motor.
NOTE! For EN 60204-1 emergency stop according to stop category 0, use emergency stop button.
F1
1
2
3
4
5
6
L1 L2
MAIN CIRCUIT
L3
L1 L2 L3
UV W
PE
X10
2
7
W1
M1
M
3
~
U1
1
V1 W1
2
PE
R1
SPEED REFERENCE
S
CCW
CW
W12
1r 2p 2s1sh 2sh
OPTA1
Basic I/O
SLOT A
1
+10Vref
1
2
AIA1+
2
3
AIA1
3
X2
OPTAF
SLOT B
1
SD1+
2
SD1
S1
11
12
W10
2r1b 2b1r
S6
START
13
14
4
AIA2+
4
5
AIA2
5
6
+24V
6
7
GND
7
3
SD2+
4
SD2
21
RO1 NC
22
RO1 C
21
22
CONTROL UNIT
S7
STOP
11
12
8
DIN1
8
9
DIN2
9
10
DIN3
10
11
CMA
11
X1
A B
23
RO1 NO
C D
X2
25
RO2C
A B C D
26
RO2 NO
X3
B
A
28
TI1+
12
+24V
12
13
GND
13
14
DIN4
14
15
DIN5
15
X10
X6
A B
29
TI1
C D
16
DIN6
16
17
CMB
17
18
AOA1+
18
19
AOA1
19
20
DOA1
20
START
res et
STOP
Vac on
+
select
enter
9
S8
RESET
13
14
OFF
Safe dis a ble
Shortcircuit and
earth fault
protected s upply
0V
+24V
PE
PE
PE
PE
PE
PE
PE PE
PE PE
PE
11058.emf
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