Chapter 7 ___________________________________________________________ Troubleshooting
VAISALA_______________________________________________________________________ 97
4. Verify that the ceilometer starts operating properly. A quick status
check can be made by looking at the LEDs on the CLE321 board
(see Figure 26 on page 111). After the initialization routines, the
Laser on LED should start blinking at 2-second intervals. If all the
key modules are ok, also all the six diagnostic LEDs should light
up.
5. A blower check is done during the first five minutes, during which
the blower is running. The automatic check also verifies the
functioning of the blower heater. The result of this check is
available five minutes after starting the unit and it is indicated by
the
CLB ok LED. It is also displayed in the status message.
6. To get the failure status message, type the
open command and
press ENTER on the maintenance terminal (PC) keyboard.
A CEILO > prompt should appear. Give the
get failure status
command and press ENTER.
An example of the response is as follows:
Alarms
Tmit Shutoff OK Transmitter ALRM
Receiver OK Voltages OK
Ext Memory OK Light Pth Obs OK
Rec Saturat OK Coaxial Cable OK
Engine OK
Warnings
Window Contam OK Battery Low OK
Transm Expire OK Humid High OK
Blower OK Humid Sensor OK
Int Heater OK High Rad OK
Engine OK Battery OK
Laser Monitor OK Receiver OK
Tilt Angle OK
System Status: FAIL
Suspect Module: CLT
The two last lines in the status message will indicate if there are
warnings or alarms present. The
Suspect module line indicates the
sub unit that is suspected to be faulty. In this example, it is the
Ceilometer Transmitter CLT321.
7. Wait until the 5-minute blower check is over and check the result
from the status message. After this, place a piece of white paper on
the ceilometer window. The blower should start within one minute.
Remove the paper. The blower should stop within eight minutes.
8. If there are clouds present, compare the ceilometer measurement
with a qualified weather observer's height approximation.
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