5
EN
FWS 1206
Operating instructions
Fail-safe standstill monitor
8.2 Integral System Diagnostics (ISD)
The LED indication of the safety-monitoring modules shows the different
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 flashes 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 flashes yellow
(2 Hz)
The motor is running, the limit frequency
has been exceeded. The enabling paths
are open.
Table error indications
Indication (orange)
LED
Error
Cause
1 impulse
Frequency sensor 1
too low,
Error input X1
Defective lead or
defective proximity
switch
2 impulses
Frequency sensor 2
too low,
Error input X2
Defective lead or
defective proximity
switch
Only one proximity
switch: bridge X1/X2
is missing
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
8 impulses
Contactor error
The condition of the
additional standstill
signal does not cor-
respond with the
detected frequencies,
e.g. the additional
standstill signal signals
a standstill, whereas
the proximity switches
signal that the limit
frequency is exceeded.
Deleting the error message
The fault message will be deleted once the fault has been rectified and
a rotational movement has been detected for the input signals check.
All fault messages will also be deleted when the reset button is pushed.
