5
AZS 2305
Operating instructions
Fail-safe delay timer
EN
8.2 Integral System Diagnostics (ISD)
The safety monitoring modules LED display to show the different
switching conditions and faults. The following tables show the different
switching conditions.
Tables switching condition indication
Diagnostic LED
System condition
The LED is red.
Comparison time value channel I with time
value channel II faulty (setting coding and
sliding switches)
The LED is green.
Enabling paths closed
LED flashes yellow
(0.5 Hz)
Input signal in starting position,
enabling paths opened
The yellow LED is flas-
hing (refer to table 2).
Time rating realised, maximum residual
time value can be derived from table 2
Table error indications
Indication (orange)
LED
Error
Cause
1 impulse
Input signal S14/
S22 at S1
Feeder cable for signal
input S1 defective;
Error during signal
change*
2 impulses
Time processing
Time value channel I
too high
3 impulses
Time processing
Time value channel II
too high
4 impulses
Interference at
inputs, no safe
evaluation
Too high capacitive or
inductive interference
at the inputs or the
supply voltage lead
5 impulses
One or both relays
did not close within
the monitoring time
Too low operating
voltage U
e;
Defective relay
6 impulses
Relays not deacti-
vated upon signal
change
Welded relay contact
7 impulses
Dynamic monitoring
of both channels
(cross-monitoring)
failure
Internal data transmis-
sion interrupted
* Signal change:
The signal change has only occurred at one input or the signal change
has occurred at both inputs with intervals of over 5 seconds.
Deleting the error message
The fault message is deleted once the fault has been rectified and after
the input signal S1 has been switched to starting position to check the
various functions.
