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3Tk2845-.Hb40 "Monitored Start-Up And Automatic Start-Up", Instantaneous; Circuit - Siemens 3TK2845 Manual

Safety relays, multifunction device
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5.1
3TK2845-.HB40 "Monitored Start-up and Automatic
Start-up", Instantaneous Outputs
Brief description:
Monitoring an EMERGENCY-STOP control switch with monitored start-up,
protective door monitoring with automatic 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;
U
24 V DC
s
Function:
Standard operation:
When the EMERGENCY-STOP control switch is activated, 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 feedback circuit at Y64 is
closed and the START button Y34 is activated.
When the protective door is activated, outputs 14, 24 (M1) and 34, 44 (M2) also
switch off.
The outputs are automatically switched back on again when the protective door
is closed.
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, outputs
34, 44 (M2) switch on automatically.
When the EMERGENCY-STOP control switch is activated during maintenance,
outputs 14 and 24 (M1) also switch off. The outputs can only be switched back
on again when the EMERGENCY-STOP control switch releases, the feedback
circuit at Y64 is closed and the START button Y34 is activated.
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.
5-2
3TK2845 Multifunction Device Manual
GWA 4NEB 926 2087-22 DS 01

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