STO AND SS1 SAFETY FUNCTIONS vacon • 27
Local contacts: https://www.danfoss.com/en/contact-us/contacts-list/
3.4.4 Example 4: OPTAF board with external time delayed safety relay for
Safe Stop 1 (SS1) or EN 60204-1 stop category 1
Figure 11. Example 4.
Figure 11 presents a connection example of OPTAF board for STO safety function with external time
delayed safety relay module for realizing the Safe Stop 1 or EN 60204-1 Stop Category 1.
External safety relay module is connected to the switch S1. The safety relay module is connected to
OPTAF board with 4 wires as shown in Figure 11. The time delay settings of the safety relay must
correspond to the application requirements.
When the switch S1 is activated, the safety relay module will immediately activate DIN6, which in
turn activates the STOP command to the drive. The STOP function is programmed to "Stop by
Ramp". The safety relay activates the Safe Torque Off state after the time delay has expired. The
time delay is set more than the deceleration time set in the drive to stop by ramp from maximum
speed. The drive will indicate: "A30 SafeTorqueOff".
When the switch S1 is released (contacts closed), the drive returns to ready state. The motor can
then be run with a valid start command.
The external relay can be wired so that manual reset is required to reset the STO safety function.
More information regarding the safety relay module may be found from the safety relay datasheet.
F1
1
2
3
4
5
6
L1 L2 L3
L1 L2 L3
UVW
PE
X10
W1
M1
M
3
~
U1
1
V1 W1
2
PE
MAIN CIRCUIT
+04W12
1r 2 p 2s2sh1sh
R1
SPEED REFERENCE
S
CCW
CW
1 2
2
7
X2
OPTA1
Basic I/O
SLOT A
OPTAF
SLOT B
1
+10Vref
2
AIA1+
1
SD1+
3 4 5 6
3
AIA1
4
AIA 2+
5
AI A2
6
+24V
2
SD1
3
SD2+
4
SD2
21
RO1N C
A10
57 67 A1
+
S12
RESET
S33
58
+24V
68
A2
0VDC
PHOENIX C ONTACT
CONTROL UNIT
7
S6
START
13
14
8
S7
STOP
11
12
9 10
7
GND
X1
8
DIN1
A B C D
9
DIN2
X2
A B C
10
DI N3
D
22
RO1 C
23
RO1N O
25
RO2 C
26
RO2NO
S34
S1
11
12
S11 S22
21
22
11 12 13 14
X3
11
CMA
B
A
12
+24V
X6
A B C D
13
GND
14
DIN4
28
TI1+
X1 0
OFF
29
TI 1
PSRSCP 24DC/ESD/5X1/1X2/300 (With screw connection)
15 16 17 18
15
DIN5
16
DIN6
17
CMB
18
AOA1+
19 20
19
AOA1
20
DOA1
START
reset
STOP
Vaco n
+
select
enter
9
Shortcircuit and
earth fault
protected supply
0V
PE
PE
PE
W3
1r 2r
PE
PE
PE
PE PE
PE PE
PE
PE
S10 S21 S35
Bridge between S33/S35 for automatic reset.
(Not allowed with emergency stop)
RAMP STOP
13
14
23
24
33
34
41
42
RS1 3E
4B RS1RS2 6B
3F RS2
24VDC
PSRSCP 24DC/ESD/5X1/1X2/300 (Withspringcage connection)
OR
11060.emf
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