IN19856
- 47 -
Rev 2
Possible Cause: Connector Not Connected or Not Powered
1.
If a communication cable is not connected to the connector associated with the LED, the LED will
be off. If this connection is not required, putting a seal cap on the connector is recommended.
2.
The cable is not connected to another operating device. Verify the communication cable is
properly connected between the other device and the ITV. Also, verify the other device is
operational.
3.
If the problem persists, contact SMC Technical Support for assistance
26.6.
Problem: ITV Web Page Pressure Value Differs from Master
Calculated Value
Note: The master device reported pressure is calculated from the pressure count value received by
the master from the ITV.
Possible Cause: ITV and Master Pressure Units Differ
The selected pressure unit
displayed
on the ITV web page
is
different
from the pressure unit
used to
calculate
the pressure value from the
counts sent to the
master device
.
1.
Confirm the pressure unit displayed on the ITV web page matches the pressure unit used to
calculate the pressure value from the counts sent to the master. Also refer to the conversions in
Possible Cause: Incorrect Count Calculation
1.
Verify the correct formula for calculating pressure is used for determining pressure value. (See
the conversions in
.
Possible Cause: Pressure Change in Progress
1.
If the master requested a pressure value change and the ITV has not settled to the new pressure
value, the web page may display a different pressure value than the calculated value. Check the
pressure value once the ITV has settled to the new pressure value.
Possible Cause: ITV and PLC Use Different Byte Order for Data Transfer
1.
Confirm the setting of the “Swap PLC Data Bytes” checkbox on the
Network Webpage. Verify the
setting matches the master device. The “Swap PLC Data Bytes” checkbox can be changed to see if
this corrects the problem.
2.
If there is still a problem, contact SMC Technical Support for assistance.
26.7.
Problem: ITV Does Not Reach Set Pressure
Symptom: ITV “Buzzes” When Directed to Set a Pressure
Possible Cause: In
Inadequate Supply Pressure
1.
Verify that supply pressure is at least set at Minimum Pressure (
Set pr 0.1 MPa
- or
Set
Pressure
–
13.3 kPa
for
ITV2090
Vacuum ITVs).
2.
If the problem persists, contact SMC Technical Support for assistance.
Symptom: ITV Makes “Hissing” Sound when Operated at Pressure
Possible Cause: Air or Vacuum Leak
1.
Verify that fittings are properly installed in the correct ports.
2.
Verify that air lines are properly installed.
3.
Verify that the air lines are not cut or punctured.
