4
Operating instructions
Fail-safe standstill monitor
FWS 1205
EN
FWS 1205
L1
L1
100mA
K1
K3
max.
K4
3
K2
+24 VDC
+24 VDC
+24 VDC
0 V
0 V
N
M
R
E
AES 1235
14
A1
100mA
S13
K1
A2
max.
Y1
X1
K2
S14
S21
S22
13
23
24
A1
A2
Y2
X2
K3
K4
V0
N
14
A1
A2
Y1
X3
X1
X2
13
23
24
A1
A2
Y2
A1
A2
14
13
21
22
41
42
51
52
71
72
63
64
AZM 161-12/12
Legend
H
Start button (optional)
E
Release button (optional)
J
reset button
R
Inductive proximity switch
A
Solenoid interlock
B
Safety switch
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
LED is green
Enabling paths closed
LED flashes yellow
(0.5 Hz)
When two proximity switches are con-
nected, only one switch has exceeded the
lower limit frequency, the enabling paths
are open
LED flashes yellow
(2 Hz)
The motor is running, the limit frequency
has been exceeded. The enabling paths
are open
In case of error messages, the LED lights orange intermittently.
During these intermissions, the LED flashes with short pulses.
Table error indications
Indication (orange)
LED
Error
Cause
1 impulse
Frequency sensor 1
too low,
Error input X1
Defective lead
Defective proximity
switch
2 impulses
Frequency sensor 2
too low,
Error input X2
Defective lead
Defective proximity
switch
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 volt-
age U
e
;
Defective relay
6 impulses
Relay not disabled
upon the actuation
of the switch
May be due to contact
welding
7 impulses
Malfunction of inter-
nal data lines
Interruption of the
internal data transfer
due to a high capaci-
tive or inductive inter-
ference on the internal
data lines
Deleting the error message
The error message is deleted, when the error cause is eliminated and
the FWS can check all functions.
