UE48-2OS2D2 datasheet(62/92 Pages) SICK

62 / 92 page

S e n S : c o n t r o l - S a f e c o n t r o l S o l u t I o n S | S I c K

8015528/2012-12-17

Subject to change without notice

Safety relays

Evaluation units for switching contacts

6 2

ue44-3Sl

Internal circuitry

Channel 1 Channel 2

RESET

CONTROL-LOGIC

S31 S22

S12

S21

S11

A1 A2

13 23

14 24

S33 S34 S35

(-)

(+)

Function

After applying the supply voltage (LED SUPPLY illuminates), the

normally open contacts (13 - 14 / 23 - 24) remain open. After

completion of the on-delay set on the relay, the delay circuit (37

- 38) closes, and the LED K3/K4 illuminates. If the connected

sensor is not activated (i.e., the input circuits are closed), the

normally open contacts (13 - 14 / 23 - 24) close immediately

during automatic reset, the LED K1/K2 illuminates, and the

delay circuit (37 - 38) opens (LED K3/K4 off). In the case of

manual reset, this only occurs after pressing and releasing the

reset button.

The activation of the sensor (opening of one or both input

circuits) affects the opening of both normally open contacts (13

- 14 / 23 - 24), with LEDs K1/K2 being off, and a time delayed

closing of the third circuit (37 - 38), with LED K3/K4 illuminat-

ing.

External device monitoring (EDM)

The unit can take over external device monitoring. The contac-

tor monitoring system monitors the external relays by way of

their normally closed contacts.

Manual reset

For manual reset, a pushbutton is to be connected between

24 V DC supply and terminal S34. This reset is monitored.

For applications with mechanical locking safety switches, only

channel 2 must be closed during manual reset.

Automatic reset

For automatic reset, S12 - S35 must be linked. For applications

with mechanical locking safety switches, only channel 1 must

be closed during automatic reset.

Cross-circuit detection

Cross-circuit is detected on dual-channel wired systems, if

these are wired with opposing polarity.

Monitoring of synchronization

Only if input 2 closes no later than 0.5 sec after input 1, do

the output circuits close. If input 2 closes before input 1, the

synchronization monitoring will not be affected and the output

circuits will close. This monitoring only takes place in automatic

reset.

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