Toshiba Density (Consistency) Meter LQ500, Operation Manual

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8. TROUBLESHOOTING
8.1 Troubleshooting
If any trouble has developed, make a careful check and take appropriate steps. Table 8.1 shows
possible troubles, their causes, and remedies. If anything wrong occurs, refer to the table below and
take the necessary steps. If that does not remedy the trouble, send information on the trouble, in as
much detail as possible, and self-diagnosis data to our Service Department.
Table 8.1 Troubleshooting (1)
No. Trouble Cause Remedy
AC power is not supplied.
Check terminals [L1] and [L2] on terminal
block with voltage tester. If AC voltage is
not supplied, supply AC power in
accordance with specifications.
1
Converter power cannot
be switched on.
Fuse (2A) is blown. Replace fuse.
2
ALARM indicator lights;
density meter error
contact output..
Fault in the density meter
In accordance with Section 8.2, perform
self-diagnosis data check and restoration
operations. If ALARM indicator lights
again, send self-diagnosis data to our
Service Department.
3
While the flow is
stagnant, the indicator
is in error. The fluid in the pipeline
where the detector is
installed drained out.
4
While the flow is
stagnant, the measured
density value slowly
increases or decreases.
Density becomes uneven
because the measurement
object fluid in the fluid in the
pipe starts to sinks or
floats, thus causing the
density in the center portion
of measured fluid to
increase or decrease.
Use the externally synchronized
operation.
See Section 6.7.
(Density meter is not faulty.)