Troubleshooting - Toshiba LQ300A00 Series Operation Manual

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.
No. Trouble
Converter power cannot be
1
switched on.
ALARM indicator lights;
2 density meter error contact
output..
While the flow is stagnant,
3
the indicator is in error.
While the flow is stagnant,
the measured density value
4
slowly increases or
decreases.
Table 8.1 Troubleshooting (1)
Cause
AC power is not supplied.
Fuse (1A) is blown.
Fault in the density meter
The fluid drained out in the piping
system where the density meter is
installed.
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.
 70 
6 F 8 A 0 7 8 7
Remedy
Check terminals [L1] and [L2] on
terminal block with voltage tester. If
AC voltage is not supplied, supply
AC power in accordance with
specifications.
Replace fuse.
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.
Use the externally synchronized
operation.
See Section 6.7.
(Density meter is not faulty.)