Vaisala LT31 - Page 269

Chapter 7 ___________________________________________________________ Troubleshooting
VAISALA ______________________________________________________________________ 269
R34:Receiver Unit
LTR111; not
responding
Receiver Unit does not respond
to LT31 system polling request
Check whether all the Receiver Unit lines
are connected properly
Check whether all connections concerning
the RS-485 Module Bus are connected
properly.
R35:Receiver Unit
LTR111; unknown
Any Receiver Unit Module has
been changed since last Offset
and Visibility Calibration.
Perform an Offset and Visibility Calibration
(see section Offset and Visibility Calibration
on pag
e 234).
T1:Transmitter Main
Transmitter LTL112;
LED driver error
T2:Transmitter Main
Transmitter LTL112;
LED driver error
The intensity value of the Main
Transmitter LED is out of limits for
normal operation or has been
evaluated as to be off.
T3:Transmitter Main
Transmitter LTL112;
LED driver error
T4:Transmitter Main
Transmitter LTL112;
LED driver error
The derating value of Main
Transmitter LED has been
evaluated as to be off.
Replacement of the Main Transmitter
Module is necessary (see section
Replacing Main Transmitter Module on
page 216).
T5:Transmitter Main
Transmitter LTL112;
LED aged
The derating value of the Main
Transmitter LED has been
evaluated as to be high.
Replacement of the Main Transmitter
Module in mid–term range (see section
Replacing Main Transmitter Module on
page 216).
T6:Transmitter Main
Transmitter LTL112;
LED error
The derating value of the Main
Transmitter LED has been
evaluated as to be too high.
Replacement of the Main Transmitter
Module (see section Replacing Main
Tran
smitter Module on page 216).
T7:Transmitter
Window Transmitter
LTL212; LED driver
error
T8:Transmitter
Window Transmitter
LTL212; LED driver
error
The intensity value of the Window
Transmitter LED is out of limits for
normal operation or has been
evaluated as to be off.
T9:Transmitter
Window Transmitter
LTL212; LED driver
error
T10:Transmitter
Window Transmitter
LTL212; LED driver
error
The derating value of Window
Transmitter LED has been
evaluated as to be off.
Replacement of the Window Transmitter
Module is necessary (see section
Replacing Window Transmitter Module on
page 213).