Document No.:KE-4011-03 Page: 26/27
21. Trouble Shooting
Detected Troubles Causes of Troubles Remedial Measures
Troubles with Actuators
Disturbed supply of
air pressure
Malfunction or insufficient capacity of
compressors
Check/repair of compressors;
check/repair of tubing systems
Air leakage from tubing between
compressors and actuators
Air flow disturbed by foreign objects
within tubes; Too small tubing sizes;
Pipe damage or freezing
Check/repair of tubes
Defective regulators Repair/replacement of regulators
No activation of
actuators under full
air pressure
Foreign objects stuck with valve seats Disassembly/maintenance/repair of
valves
Excessive raise of valve operating
torque
Disassembly/maintenance/repair of
valves; Increase of operating pressure
(Max 0.69 MPa, 100 psi)
Excessively throttled speed controllers
Readjustment of speed controllers
Rejective actuators Repair/replacement of actuators
Troubles with Solenoid Valves
No Activation of
energized solenoid
valves;
Unusual noise
Excessive
temperature raise
Breaks of electric circuits Check/repair of electric circuits
Defective electromagnets Check/adjustment of voltage;
replacement of coils
Water intrusion into electromagnets or
terminals
Water prevention; replacement of coils
Inadequate voltage Check/adjustment of voltage; Check of
solenoid valve specs; replacement of
coils
Foreign objects stuck in solenoid valve
interior
Disassembly/cleaning/replacement of
solenoid valves
Excessive leak from
exhaust ports of
solenoid valves
Worn piston O-ring; Foreign objects
stuck to piston O-rings
Disassembly/cleaning of actuators;
Replacement of O-rings
Worn seating parts of solenoid valves ;
Foreign objects stuck to sealing parts
of solenoid valves
Check/replacement of solenoid valves
O-ring identification number is displayed on the back
of the new end cover.
If the O-ring number is indicated, select a spare part
kit for the actuator manufactured after 2013.
O-ring identification number of end cover
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