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Service Manual
Third edition, June 1997
If there are more Slave Work Stations, check for any messages on these.
• If only one slave Work Station has the message “NO CONTACT
WITH MASTER WORK STATION”, concentrate your fault finding
on this Work Station.
• If all Slave Work Stations have the message displayed, check Master
Work Station, the network cables or the Network Board in the Master
Work Station.
If Master Work Station is turned on and running without any problems:
• Check cables between the Master and Slave Work Station.
• Check Network Board in both Slave and Master Work Station.
9.3 Channels with status CFAIL, ERROR or INVAL
9.3.1 CFAIL status on one Transmitter
Cables from Level Unit to Transmitter faulty
• Disconnect Transmitter cables at Transmitter Interface (LI) in Level
Unit and check cables to Transmitter.
• Interchange connectors of failing Transmitter with one that is OK.
Watch these two channels on Work Station. If failing Transmitter
becomes OK, find a spare connection on LIZ. Connect the
Transmitter and configure to new address using Transmitter Data-
window in the service part of the Work Station software.
LIZ board in LI may be faulty
• If there are two LIs in the Level Unit, try exchanging them to find out
if it is broken. See chapter 5.10.8 for information on how to change an
LI.
• Exchange with LIZ board from the Complete Spare Parts set. See
chapter 5.10.9.
Faulty Electronic Box
• Replace Electronic Box, see chapter 6.1.
9.3.2 CFAIL status on five Transmitters
LIZ board in LI may be faulty
• Check if the five Transmitters are connected to the same LIZ board in
the LI (that the connectors are placed in a vertical row). If they are,
the LIZ board needs to be replaced. See chapter 5.10.9 for information
on how to replace it.
• Exchange with LIZ board from the Complete Spare Parts set. See
chapter 5.10.9.
9.3.3 ERROR status on one Transmitter, but not CFAIL status
Surface echo is lost. There can be waves, turbulence or foam on the surface
of the product. A very large list angle could also cause the echo to be lost.
• Wait while system searches for the surface echo.
• Order an echo search on that tank from the TX Service-window in the
Service-part of the Work Station software. See chapter 3.25.
Faulty Electronic Box
• Replace Electronic Box, see chapter 6.1.