172-65256M-00 (VFM-T2) 7 Sep 2001
17
Operation
Preparations Before Operation
Inspect the counter and associated instruments to ensure that they are correctly
installed and wired and that nothing has been overlooked.
<Warning> Use of a power source of an incorrect voltage may result in
burnout of the counter. Make certain to use a power source of the rated
voltage.
(Pre-operational Check)
Supply power to the counter. Press the [MODE] button to test function and check for
irregularities.
<Caution> Avoid repeatedly turning the power ON and OFF, as this may
cause the counter to begin counting.
Next, supply a simulated pulse train of the appropriate type to confirm that the counter
counts and displays a correct totalized flow and instantaneous flow rate in response.
Operation
After pre-operational preparations are completed, turn on the power.
Troubleshooting
u
IMPORTANT
u
When internal trouble is suspected, contact TLV after inspecting the
counter by following the steps below.
Symptom
Check Item
Possible Causes
Is power being supplied?
(1) Check the voltage
(2) Inspect the fuse
(1) The supply voltage is incorrect
(2) The fuse is blown (internal)
(3) The power supply unit is
faulty
The display
indicates neither
total flow nor
instantaneous flow
rate
Is a pulse input train
being supplied?
(1) Is the wiring correct?
(2) Is the pulse input train
reaching the counter?
(1) The input lines are wired incorrectly
(2) The transmitter is faulty
(3) The waveform shaping circuit is
faulty
(4) The custom (
µ
CPU) is defective
u
IMPORTANT
u
If the problem is suspected to be other than one listed above, contact the
TLV service network. When contacting TLV, be prepared to provide details
such as the product name, model and symptoms of the problem.
