Vacon OPTAF, User Manual

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vacon • 20 STO AND SS1 SAFETY FUNCTIONS
Local contacts: https://www.danfoss.com/en/contact-us/contacts-list/
3.3.4 External light test pulse filtering capability
To verify the switching capabilities of STO lines' switches, some safety actuators test their outputs
by pulsing the output from low to high level for short periods of time when STO is enabled. The puls-
es are known as 'light test pulses'. Allowed pulse characteristics are introduced in Table 3.
To prevent the test pulses from causing false STO deactivation commands or false fault indications,
the used connection must not create current path through STO inputs. Only connection example 1
is allowed. See the connection examples in Chapter 3.5.1. Only one switch is allowed to be tested at
a time.
3.3.5 Connections
In addition to the STO inputs, the board contains also a thermistor input. If the thermistor input is
not used it must be disabled. The thermistor input is disabled by making a short circuit to the ter-
minals and setting the jumper X10 in "OFF" state. The thermistor input operation and instructions
are presented in Chapter 4.
I/O terminals on OPTAF
Table 3. Pulse characteristics
Pulse characteristics Dark test pulse Light test pulse
Test pulse length < 1 ms (24 V) < 1 ms (24 V)
Period > 20 ms > 20 ms
Frequency < 50 Hz < 50 Hz
CAUTION! When using other connection than "Connection example 1" with light
test pulse function, forbidden pulse structure or by testing both switches (SW P &
SW M) simultaneously, the drive may enter ready state even if STO should be ac-
tivated. This may cause unintentional rotation of the motor shaft. See the connec-
tion examples in chapter
4.2.1 .
Table 4. OPTAF I/O terminals
Terminal
Parameter reference
on keypad and
NCDrive
Technical information
1 SD1+
DigIN: B.2
Isolated STO input 1 +24 V
2 SD1- Virtual GND 1
3 SD2+
DigIN: B.3
Isolated STO input 2 +24 V
4 SD2- Virtual GND 2
21
22
23 RO1/normal closed
RO1/common
RO1/normal open
DigOUT: B.1
Relay output 1 (NO/NC) *
Switching capacity 24 VDC/8 A
250 VAC/8 A
125 VDC/0.4 A
Min. switching load 5 V/10 mA
25
26 RO2/common
RO2/normal open
DigOUT: B.2
Relay output 2 (NO) *
Switching capacity 24 VDC/8 A
250 VAC/8 A
25 VDC/0.4 A
Min. switching load 5 V/10 mA
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