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User's Guide _______________________________________________________________________
Status Message Typical
to clean value.
TR. BACKSCATTER
Control signal for
the transmitter
contamination.
'CHANGE' value
is the instant
signal difference
to clean value.
LEDI
LED intensity.
Actuating signal
for the LED
control
(transmitter)
112___________________________________________________________________ M210543EN-B
Min. / Max.
Fault
Rec.backscatter
change (Instant
backscatter
minus clean
backscatter) >
warning limit
'BACKSCATTER
INCREASED'
Instant
backscatter <
clean backscatter
/ 2
'BACKSCATTER
HIGH'
<-15 V
>14 V
'TRANSMITTER
ERROR'
-8 V / +7 V
>+7 V
<-8 V
'TRANSMITTER
ERROR'
<-6
'TRANSMITTER
INTENSITY
LOW'
Description
Action
contamination
limits also.
1) Clean the
outside of the
optical
surfaces and
remove
possible
disturbances
from the
optical path.
2) Replace
the clean
contamination
setting by
giving the
CLEAN
command.
3) Change the
PWC22
control unit.
The decreasing
value can be
caused as above:
(REC.
BACKSCATTER)
Changes in
Change the
voltage can be
PWC22
caused by aging
control unit.
of the LED
(voltage
decreases).
If the voltage is
between
-6 V... -7 V, the
control loop is
operating
properly but the
IR LED must be
changed in the
near future.
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Table of Contents
Troubleshooting
