External circuitry
10.2 Typical circuits
3TK2826 safety relay
42 Manual, 08/2007, GWA NEB 926 1579-02 DS 02
Table 10-5 Circuit example 3: Safety shutdown mat operation with cross-circuit detection, with
monitored start
• Safety shutdown mat
• With cross-circuit detection
• 2 NC contacts
• Monitored start
• 3TK2826-.BB4. and
• 3TK2826-.CW3.
DIP switch
1 2 3 4 5 6 7 8
1 0 0 — 1 — — —
Category in accordance with DIN
EN ISO 13849-1
3
Y12 T1 Y33 T3 1
Y22 T2 Y34
START
K
1
K
n
.
.
.
Safety Integrity Level (SIL),
in accordance with IEC 61508
2
WARNING
Prerequisites for monitoring with safety shutdown mats in accordance with DIN EN 1760-1:
• only safety shutdown mats may be connected
• Safety shutdown mats with cross-circuit evaluation only
• Safety shutdown mat and cable resistance < 1000 Ω
• 4-wire system
To Next Page
Loading...
