Measurement Technology NW
LCI-90 Operator Manual
Page 52
8.0
Troubleshooting
The LCI-90 was designed with the user in mind. Using full language menus and a minimum of
abbreviations makes the programming and operation much easier to understand. A diagnostics
screen described in the section below is easily accessible by the user to check raw input signals.
Most apparent malfunctions of the instrument can usually be traced to incorrect wiring, jumper
settings, or programming. Consult the troubleshooting chart in section 8.2 to diagnose apparent
problems.
8.1
DIAG screen operation
Pressing the
DIAG
key from the Run mode display will bring up the Diagnostics screen.
This display, shown in Figure 8.1, provides the operator with important feedback on raw
signal inputs, and scaled display values for Tension and Payout. From the DIAG screen,
the same button, which is now labeled
MAIN
, will return the system to the main RUN dis-
play mode. The instrument continues normal operation, including updating remote displays
and checking alarm limits in the background while the DIAG screen is on display.
INPUT
VALUE
SCALED
IN–1
4.765 mA
1450 LBS
IN–2
7.430 mA
2308 LBS
COUNT
2452 P
12630 FT
Figure 8.1 – Diagnostics Screen Display
The first items displayed are the active analog input channels. There can be from one to
four of these, depending on the Analog Input Configuration (two are shown in Fig 8.1).
These lines show the raw input signal as measured by the LCI-90, and the resulting scaled
Tension
on a per-channel basis
(the combined result of multiple inputs is only displayed on
the RUN screen). The bottom line shows the Payout counter and resulting scaled Payout in
the selected units.
The utility of the DIAG screen is clear when a malfunction occurs. Comparing the display-
ed values with measurements from a multimeter can help identify if the fault lies in the
sensor/wiring, or within the instrument and its setup configuration.
An additional function of the DIAG screen is described in Section 6.3.2. When an Input
Check Alarm occurs, the LCI-90 automatically displays the DIAG screen with the outlying
input channel highlighted (as shown in Fig 8.1 for channel 1). An alarm connected to OP1
(TB3-1) is also turned on. Pressing the
ALRM
button will silence the alarm and pressing
MAIN
will return to the normal RUN screen, but the channel will continue to be highlighted
whenever the DIAG screen is displayed until the Input Check condition goes away.