5
FWS 2105
FWS 2505
Operating instructions
Fail-safe standstill monitor
EN
Legend
A
Positive break
R
Proximity switches
J
Reset button
I 0
On/off switch
H
Start button
E
Unlocking button
X
Additional standstill signal
A
Solenoid interlock
B
Safety switch
8.2 Integral System Diagnostics (ISD)
The LED indication of the safety-monitoring modules shows the dif-
ferent switching conditions and errors. The switching conditions are
explained in the following tables.
Tables switching condition indication
Diagnostic LED
System condition
The LED is green.
Enabling paths closed
LED lashes yellow
(0.5 Hz)
When two proximity switches are
connected, only one switch has
exceeded the lower limit frequency,
the enabling paths are open
LED lashes 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 lashes with short pulses.
Table error indications
Indication (orange)
LED
Error
Cause
1 impulse
Frequency sensor 1
too low,
Error input X2
Defective lead
Defective proximity
switch
2 impulses
Frequency sensor 2
too low,
Error input X4
Defective lead
Defective proximity
switch
3 impulses
Fault voltage X2/X4
One or both proximity
switches supply no
output voltage:
defective proximity
switch or disconnected
cable
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
Relay not disabled
upon the actuation
of the switch
May be due to contact
welding
7 impulses
Malfunction of
internal data lines
Interruption of the
internal data transfer
due to a high
capacitive or inductive
interference 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.
