Azbil 700 series - The Device Does Not Operate. (There Is no Output Air Pressure.); The Control Valve Operates Abnormally (There Is Output Air Pressure.); Failure to Communicate with the Communicator

5-2
5-1 Troubleshooting
If a problem occurs when operation starts or during operation, address the problem
according to the procedure below. If the problem cannot be solved after taking the
actions described below, the device may be malfunctioning. Please contact us.
5-1-1 The Device Does Not Operate. (There Is No Output Air Pressure.)
1. Check that setup has been properly completed (e.g. allowable rotation angle of
feedback lever).
2. Check that an appropriate supply air pressure is supplied (e.g. air leak).
3. Check that an appropriate input signal (power supply) is input (e.g. whether electrical
wiring is correct).
4. When communication is possible, have the device perform self-diagnostics and take
actions according to the displayed messages. Please refer to 5-2, “Description of
Messages.”
5. Check whether the internal data in the device is properly specified.
5-1-2 The Control Valve Operates Abnormally (There Is Output Air Pressure.)
1. Activate the manual operation status with the A/M switch, adjust air with the regulator,
and check that the valve shaft moves smoothly. (Check whether galling or packing
solidification has occurred.)
2. Check whether the internal data in the device is properly specified (actuator size and
hysteresis, among other data).
3. If the symptoms of the problem can be found in the table below, take the
corresponding actions according to the table.
Problem Point to be checked and action
Hunting
Overshoot
- Check that the allowable rotation angle of the feedback lever
is obeyed.
- Change the friction level from Light to Medium to Heavy. If
this does not solve the problem, change the actuator size
setting to a smaller parameter with the friction level set
to Heavy. (For the work procedure, refer to “Adjustment
Procedure when Hunting Occurs” on the next page.)
The device does not
complete a full stroke.
The response speed is
too slow.
- Check that the fully closed and open positions (zero and
span) of the valve are properly adjusted.
-
Check that the EPM drive signal is within the range of 50 ± 25%.
5-1-3 Failuretocommunicatewiththecommunicator
1. Check whether the electrical wiring is correct.
2. Check whether the communicator is correctly connected with the device.
3. Check whether both input and output devices have power sources.
4. Check whether the relationship between the power supply voltage and external load
meets the specifications.
5. Check whether the wiring is correct for the Models without the motion transmission
function (model AVP702) and with the motion transmission function (model AVP701)