Unipulse F350, Operation Manual

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99
11 SUPPLEMENTS
99
SUPPL
EMENTS
Chapter
11
11-8.
Troubleshooting
Item Question Answer/remedy
Sensor
Can four sensors be
connected?
In the F350, the excitation voltage is shared by 2 channels.
There is a need to use it in a range of output current that the
2 channels total does not exceed 60mA. For example, one
350
Ω sensor the excitation voltage of which is 10V can be
connected to each channel at the maximum.
Is a correct indicated value
displayed by simply
connecting sensor(s)? Match the sensor output and indicator by equivalent input
calibration or actual load calibration. Then, the indicated
value is displayed in proportion to the sensor output.
Wiring and
connection
The power cannot be turned
on.
Check to see if the power cord is properly connected.If not,
connect the power cord properly.
Check to see if the power source is within the specified
range. If not, use a power source within the specified range.
The indicated value is
abnormal.
Check to see if the sensor is properly connected. If not,
connect the sensor properly.
Check the sensor for damage. Connect a normal sensor.
Check the sensor for a mechanical load. Prevent such a
load.
When normal, if not improved in spite of the above
measures, remove the sensor, and short-cSIG, -SIG,
and -EXC on the terminal block, so that the error goes out
and the value becomes stable.
Setting and
operation
It is desired to decrease the
number of digits of the
numerical value.
Since there is a need to decrease the number of digits of the
value input during equivalent input calibration or actual load
calibration, perform calibration again. Also, set the load-
related setting values, such as HI and LO limit values, again
according to that number of digits.
How to get hold is unclear.
The control method may differ according to the hold mode
used. See "7-1 Hold functions of calculated values" on page
50.
Judgment results are not
output.
Check to see if the output cable is properly connected. If not,
connect the output cable properly.
In the case of calculation comparison output, the output
conditions differ according to the setting of comparison
timing. See "6-5 Calculation comparison timing" on page 48.
Lower digit(s) of the
indicated value fluctuates.
Check for calibration exceeding 10000 at 1mV/V. Since the
resolution is approximately 10000 with respect to 1mV/V,
calibration exceeding it will cause coarseness, and the
indicated value will fluctuate and not become stable. For
using as it is, ignore the lower digit(s), or set the min. scale
division again.
Is the voltage output and D/A
option different?
The voltage output outputs the sensor input as it is amplified.
It is different from the D/A converter that converts from digital
to analog through digital processing. Consider that the D/A
converter is synchronized with the indicated value.