Outputs; 3Tk2845-.Db40 "Monitored Start-Up", Instantaneous Outputs - Siemens 3TK2845 Manual

5.3 3TK2845-.DB40 "Monitored Start-Up", Instantaneous

Outputs

Brief description:
Monitoring an EMERGENCY-STOP control switch and a protective door with moni-
tored start-up and maintenance according to Category 4, EN 954-1.
Properties:
Stop category 0 according to EN 60204-1;
Two electronic enabling circuits;
Two floating enabling circuits;
One electronic signaling output;
Us 24 V DC
Function:
Standard operation:
When the EMERGENCY-STOP control switch or the protective door is activa-
ted, outputs 14, 24 (M1) and 34, 44 (M2) switch off. The outputs are switched
back on again when the EMERGENCY-STOP control switch releases, the pro-
tective door is closed, the feedback circuit at Y64 is closed and the START but-
ton at Y34 is activated.
Maintenance:
When the key-operated switch is operated, outputs 34, 44 (M2) switch off and
the position switches of the protective door are not evaluated. When the key-
operated switch is operated once again with the protective door closed and the
START button Y34 is activated, outputs 34, 44 (M2) switch on. If, however, the
protective door is not opened after the key-operated switch was activated, out-
puts 34, 44 (M2) automatically switch on after the key-operated switch is activa-
ted once again.
Note:
Connecting several position switches in series for protective door monitoring is
not permissible for Category 4 according to EN 954-1 (fault detection).
Notice
Sensor cables should be routed in a protected manner; only safety sensors with
positively-opening contacts may be used as sensors.
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3TK2845 Multifunction Device Manual
GWA 4NEB 926 2087-22 DS 01