Start-Up And Commissioning; Technical Data; Sto Components - ABB ACS355 User Manual

24 V auxiliary voltage load (I/O, panel load, used fieldbus or STO circuits; max.
200 mA) of the drive supplying the STO circuit (see section
on page 369). When using external supply, all analog grounds (AGND) of the drives
must be chained together.
Note: Daisy chaining lowers the total system safety integrity level, which needs to be
calculated case by case for each system.

Start-up and commissioning

Always test the operation and reaction of the STO function before commissioning.

Technical data

STO components

STO safety relay type
General requirements
Output requirements
No. of current paths
Switching voltage capability
Switching current capability
Maximum switching delay
between contacts
Example 1
Type and manufacturer
Approvals
Example 2
Type and manufacturer
Approvals
STO connection
Input for external STO
supply
Input impedance
Load
Output
STO cable
Type
Conductor size
Maximum length
Tightening torque
Appendix: Safe torque off (STO) 403
IEC 61508 and/or EN/ISO 13849-1
2 independent paths (one for each STO path)
30 V DC per contact
100 mA per contact
200 ms
Simple SIL3 approved safety relay
PSR-SCP- 24UC/ESP4/2X1/1X2 by Phoenix Contacts
EN 954-1, cat 4; IEC 61508, SIL3
Programmable safety logic
PNOZ Multi M1p by Pilz
EN 954-1, cat 4; IEC 61508, SIL3; and ISO 13849-1, PL e
24 V DC ± 10%, load 25 mA
R = 2 kohm
in
12 mA / channel
Maximum load 200 mA depending on I/O load
2×2 cables, low voltage, single shielded, twisted pair cable
2
1.5...0.25 mm (16...24 AWG)
Max. 25 m between STO inputs and the operating contact
0.5 N·m (4.4 lbf·in)
Control connection data