Vaisala LT31, User Manual, Page: 266 / 294

User's Guide ______________________________________________________________________
266 _________________________________________________________________ M210667EN-C
R4:Receiver Main
Receiver LTD112;
AC high –
R5:Receiver Main
Receiver LTD112;
AC overrange
Main Receiver Signal is higher
than expected for normal
operation.
Check Main Transmitter Module status
(events T1 - T6). If any of the T1 - T6
events are reported, handle them first. If no
such event is reported, replace the main
receiver module (see section Replacing
Main Receiver Module on page 218).
R6:Receiver Window
Transmitter LTL212;
LED driver error
R7:Receiver Window
Transmitter LTL212;
LED driver error
R8:Receiver 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.
R9:Receiver 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).
R10:Receiver
Window Transmitter
LTL212; LED aged
The derating value of the Window
Transmitter LED has been
evaluated as to be high. Replacement of the Window Transmitter
Module in mid–term range (see section
Replacing Window Transmitter Module on
page 213).
R11:Receiver
Window Transmitter
LTL212; LED error The derating value of the Window
Transmitter LED has been
evaluated as to be too high. Replacement of the Window Transmitter
Module (see section Replacing Window
Transmitter Module on page 213).
R12:Receiver
Measurement CPU
LTC112; window
receiver DC high
R13:Receiver
Measurement CPU
LTC112; window
receiver saturated
A light source other than the
modulated transmitter signal is
detected at Window Receiver.
Either the signal is detected as
high (R12) or the receiver is
saturated (R13). Try to identify an additional light source of
any nature that might be in sight of the
window receiver. Try to eliminate the
influence.
R14:Receiver
Measurement CPU
LTC112; window
receiver AC off Window Receiver Signal is lower
than the underrange level. During start-up this event is generated as
the averaging is not complete.
Check whether the optical light path at the
V-shaped windows at receiver
measurement unit (LTM212) is blocked.
R15:Receiver
Measurement CPU
LTC112; window
receiver AC high
Window Receiver Signal is higher
than expected for normal
operation
–