CKD HD-0.5, Instruction Manual, Page: 10 / 23

6
Trouble Cause Countermeasure
Failure in
regenerative
purging. ・ Power source is not connected.
・ Abnormal voltage.
・ Wire disconnection.
・ Two solenoid valves are defective.
・ Defective timer motor.
・ Broken fuse. ・ Connect the power source
(POWER LAMP lights up)
・ Regulate to normal voltage.
・ Check and repair.
・ Replace the defective valves.
・ Replace.
・ Check, and replace the fuse.
Excessively high
regenerative
purging. ・ Defective timer motor.
・ Displacement of timer motor limit
switch(Slackened screws).
・ Intrusion of foreign substance in
solenoid valve.
・ Broken plunger spring of solenoid
valve.
・ Worn-out timer motor limit switch.
・ Excessive outlet flow rate.
・ Replace.
・ Return to normal position,
refer to
“
change-over time
chart.
”
(Tighten the screws.)
・ Overhaul and clean.
・ Replace the spring.
・ Replace the timer motor.
・ Correct to specified flow
rate.
Only one side of tube
functions for
regenerative
purging. ・ Disconnection in solenoid valve
circuit.
・ Defective coil of solenoid valve.
・ Clogged valve seat orifice.
・ Check and repair.
・ Replace the coil.
・ Clean the orifice.
Excessively high
regenerative purging
in one side of tube. ・ Intrusion of foreign substance in
solenoid valve.
・ Broken plunger spring of solenoid
valve.
・ Ball check entangled in valve seat.
・ Displacement of timer motor limit
switch(Slackened screws).
・ Worn-out timer motor limit switch.
・ Overhaul and clean.
・ Replace the spring.
・ Overhaul and clean, or
replace the ball check.
・ Return to normal position,
refer to
“
change-over time
chart.
”
(Tighten the screws.)
・ Replace the timer motor.
Excessively high
regenerative purging
for first 10 seconds,
and back to normal
later. ・ Incoming air pressure below 0.2MPa.
・ Ball check entangled in valve seat.
・ Excessive outlet flow rate
instantaneously.
・ Correct to normal air
pressure.
・ Overhaul and clean, or replace
the ball check.
・ Install a tank in the outlet
side to prevent pressure
variation.
High outlet dew point,
Moisture indicator ：
Light green or Pink ・ Low incoming air pressure.
・ Excessive outlet flow rate.
・ High temperature of incoming air.
・ Aged desiccant. ・ Regulate to normal pressure.
・ Correct to normal flow rate.
・ Correct to normal temperature.
・ Replace the desiccant.
5．TROUBLESHOOTING