Monitoring of short-circuit/
overload with CL-LST, CL-LMT
and CL-LET
377
1SVC 440 795 M1100
The following examples are for I16 = Q1 to Q4.
Example 1: Output with fault indication
Figure: 190: Circuit diagram for fault output via I16
The above circuit diagram functions as follows:
If a transistor output reports a fault, M16 is set by I16. The
N/O contact of M16 switches off output Q1. M16 can be
cleared by resetting the display system power supply.
Example 2: Output of operating state
Figure: 191: Output of operating state
The above circuit operates as described in example 1. The
signal light is triggered at Q4 for additional overload
monitoring. If Q4 has an overload, it would ’pulse’.
Example 3: Automatic reset of error signal
Figure: 192: Automatic reset of error signal
The above circuit diagram functions in the same way as
Example 2. In addition the marker M16 is reset every 60 s by
timing relay T08 (on-delayed, 60 s). Should I16 remain at 1,
M16 will continue to be set. Q1 is set briefly to 1 until I16
switches off again.
I 01----m 16-------------------Ä Q 01
I 16--------------------------S M 16
I 01----m 16-------------------Ä Q 01
I 16---------------------------S M 16
M 16---------------------------Ä Q 04
I 01----m 16-------------------Ä Q 01
I 16---------------------------S M 16
M 16---------------------------Ä T 08EN
T 08---------------------------R M 16
M 16---------------------------Ä Q 04
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