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Circuit - Siemens 3TK2845 Manual

Safety relays, multifunction device
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5.2
3TK2845-.HB41 "Monitored Start-up and Automatic
Start-up", Time-Delayed Outputs
Brief description:
Monitoring an EMERGENCY-STOP control switch with monitored start-up, and a
protective door with automatic start-up and maintenance according to Category 4,
EN 954-1.
Properties:
Stop category 0/1 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 is activated, outputs 14 and 24
(M1) switch off instantaneously and outputs 38 and 48 (M2) switch off as soon
as the specified time has expired. 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 operated, outputs 14, 24 (M1) also switch off instan-
taneously and 38 and 48 (M2) switch off with a time delay.
The outputs are automatically switched back on again when the protective door
is closed.
Maintenance:
When the key-operated switch is operated, output 24 switches off instantane-
ously and output 38 switches off with a time delay. 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 24 and 38 switch on automa-
tically.
When the EMERGENCY-STOP control switch is activated during maintenance,
output 14 switches off instantaneously and output 48 switch off with a time
delay. 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.
5-4
3TK2845 Multifunction Device Manual
GWA 4NEB 926 2087-22 DS 01

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