AB-7356-U
16
Inspection and Maintenance
WARNING
Detach the cover only when wiring, setting the product or maintenance and reattach the cover after wiring, setting
the product or maintenance. Failure to do so might cause electric shock.
Before wiring or maintenance, be sure to turn off the power to the product (including the optional devices). Failure
to do so might cause electric shock or device failure.
CAUTION
Do not carelessly touch the product when being used to control hot water. The product temperature is hot, and you
might get burned
Do not touch the moving parts of the product. Doing so might cause injury.
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/service 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.
Voltage/current 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. Voltage/current input signal therefore
disagrees with the feedback signal, and this is not an error.