AB-7352-U
15
Inspection and Troubleshooting
CAUTION
Do not carelessly touch this product when being used to control hot water or steam. The product temperature is
hot, and you might get burned.
Inspect the ACTIVAL according to Table 1.
Manually open/close the ACTIVAL at least once a month if it is left in inactive state for a long period.
Visually inspect the fluid leakage of the valve and the actuator operations every six months. If any of the problems described
in Table 2 are found, take corresponding actions shown in the table.
If your problem is not solved by the corresponding action, please contact Azbil Corporation near you.
Table 1. Inspection items and details
Inspection item
Inspection interval
Inspection detail
Visual inspection
Semiannual
Fluid leakage from the gland and the flange face
Loosened
bolts
Valve and actuator damages
Operating status
Semiannual
Unstable open/close operation
Abnormal noise and vibration
Routine inspection
Any time
Fluid leakage to the outside
Abnormal noise and vibration
Unstable open/close operation
Valve
hunting
Table 2. Troubleshooting
Problem
Part to check
Action
Fluid leaks from the flange face.
Loosened flange bolts
Gasket on the flange face
Misaligned piping
Tighten the flange bolts.
Replace the gasket.
Redo piping.
Fluid leaks from the gland part.
Consult with our sales personnel.
Fluid leaks from the bonnet.
Loosened bolts
Tighten the bolts.
Valve does not operate smoothly /
valve stops halfway /
valve does not operate at all.
Conditions of the power applied and of the input
signal applied
Loosened terminals
Wiring condition / disconnected wires
Check the power supply and the controller
connected to.
Tighten the terminals.
Check the wiring.
Fluid leaks to the outside of the valve when
the ACTIVAL is in fully closed position.
Actuator pointer not pointing to fully closed
position
Fully close the ACTIVAL.
The valve vibrates or produces an
abnormal noise.
Primary pressure condition
Differential pressure condition
Adjust the mounting position and change the
installation location.
The auxiliary switch does not operate.
Auxiliary switch (cam switch) condition
Loosened terminals
Wiring condition / disconnected wires
Redo the cam switch setting.
Tighten the terminals.
Check the wiring.
Valve hunting occurs.
Secondary pressure condition
Differential pressure condition
Control stability
Adjust the mounting position and change the
installation location.
Correct the control parameter setting of
controller.
Operating time of the spring return is too
short.
Wiring condition of the brake motor
Consult with our sales/service personnel.
Operating time of the spring return is too
long.
The spring return does not operate.
Torque of valve operation
Consult with our sales/service personnel.
The actuator does not fully closes the valve
(in 0 % position).
Consult with our sales/service personnel.
Input signal disagrees with the feedback
output signal.
To completely shut off the valve, valve open and close (0-100% position) operation is controlled
by 10-90 % range of actuator voltage/current input signal. Input signal therefore disagrees with
the feedback signal, and this is not an error.
