4
Operating instructions
Safety-monitoring module
AES 1175
AES 1176
EN
8. Appendix
8.1 Wiring examples
The application examples shown are suggestions. They however do not
release the user from carefully checking whether the switchgear and its
set-up are suitable for the individual application.
The wiring diagram is shown with guard doors closed and in a de-
energised condition. Inductive loads (e.g. contactors, relays, etc.) are
to be provided with suitable interference suppression circuitry. Do not
connect additional loads to terminal S..
AES 1175 / 1176
Increase in capacity or number of contacts, external contactor
monitoring
AES 1175
AES 1176
A1
A1
S13
S14
S21
S22
13
A2
A2
Y1
X1
X2
Y2
14
K2
K1
P1
µ
P2
µ
max.
10
0m
A
K3
K4
+24 VDC
0 V
A
+24 VDC
A
Key
A
Positive break
A Safety switch
8.2 Integral System Diagnostics (ISD)
The LED indication of the safety-monitoring modules shows the
different switching conditions and errors. The following tables show the
different switching conditions.
Tables switching condition indication
Diagnostic LED
System condition
The LED is green.
Enabling paths closed
LED flashes yellow
(0.5 Hz)
Enabling paths open
LED flashes yellow
(2 Hz)
Safety guard closed, however no release;
possible causes: incorrect operation (only
one contact actuated upon opening) or
voltage drop → perform start-up test
Table error indications
Indication
(orange) LED
Error
Cause
1 impulse
switch
Defective supply
voltage lead, defective
switch, erroneous
fitting of the switch;
switch only partially ac-
tuated* for at least 5 s
2 impulses
The external
relay is not pulled
in or drops out after
being activated.
Defective supply volta-
ge lead to the relay or
relay contact;
Defective relay
3 impulses
The external relay
does not drop out
when switched off.
Defective supply volta-
ge lead to the relay or
relay contact;
Defective relay
4 impulses
Interference signals
at the inputs (no
safe evaluation
assured)
Too high capacitive or
inductive interference
at the switch's cables
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
Relay not disabled
upon the actuation
of the switch
May be due to contact
welding
7 impulses
Dynamic monitoring
of both channels
(cross-monitoring)
failure
Fault in one channel;
internal data transmis-
sion interrupted
* Partial actuation: position of the switch, in which only one contact was actuated.
Deleting the error message
The error message is deleted once the fault has been rectified and after
the connected switch has been actuated to check the various functions
(open and then close the safety guard).
