Measurement Technology NW
LCI-90 Operator Manual
Page 56
Problem
“REMOTE DISPLAY NO VALID DATA” Displayed
Possible Causes
Diagnosis
Remedies
Incorrect menu configuration
If using the display as a local, check
Menu 4.5, Item 1.
Change the Menu 4.5
Item 1 LOC/REMOTE
mode to LOCAL
Incorrect serial communication
wiring
Check polarity of the wiring for RS-
485, with T+R+ on the local to
T+R+ on the remote. For RS-232,
Tx on the local should connect to
Rx on the remote.
Correct any wiring
errors
Incorrect serial termination
For RS-485, the display on each end
of the chain should be terminated for
best performance.
Check SW3 settings.
See Appendix B
Problem
No Outputs from Alarm Channels
Possible Causes
Diagnosis
Remedies
Incorrect menu configuration
Check the alarm configuration in
Menu 4.4 to make sure that the
expected module will be energized
by the alarm condition. Each alarm
must be programmed to output to
OP1-OP4 to energize a module
Review manual Section
5.3 for alarm use and
configuration
Incorrect DIP switch settings
Review the settings for SW2 to
configure the output module slots
See Appendix B
Blown fuse on output module
Remove fuse and check with an
ohmmeter.
Check for shorts in the
circuit and replace fuse.
Incorrect module type
Verify the part number and specifi-
cations of the installed module
Replace with correct
type
Problem
No Shunt Calibration
Possible Causes
Diagnosis
Remedies
Opto 4 module missing or
dislodged
Open unit and look inside. Locate
Opto 4 and confirm that the Opto is
there and seated properly.
Order new module or
reseat
Field wire polarity not
observed
DC module is polarity sensitive, re-
quires correct field wire termination.
Check field wires and
try reversing polarity
Blown fuse on output module
Remove fuse and check with an
ohmmeter.
Replace with correct
type