Semi-Auto Control Installation, Operation & Maintenance
DOM0000018-EN, Revision A
Page 3 of 4
Control Logic
Your control logic should be configured to allow the purge sequence to
occur by the following methods. Reference Sequence Diagram and
Control Philosophy supplied by EATON with the unit. The end user is
responsible for system function.
Troubleshooting
Symptoms
A
Actuator doesn’t operate properly
B
Purge valve will not operate properly
C
Leakage at lid seal
D
Leakage where drive shaft enters lid
E
Reduction in flow rate or high differential pressure
F
Drop in filtrate quality
Possible Faults
A
Actuator doesn’t operate properly
1
No power
a
Check to see if the filter system is receiving adequate
power.
b
Check to see if the filter system is set to the proper
voltage.
c
Check all wiring connections.
2
No air
a
Check to see if the filter system is receiving adequate
air.
b
Check for air leaks.
c
Check to see if the air bleed valve is closed and the air
block valve is open.
d
Check to see if the air lines are connected to the
correct ports.
3
Actuator seals have been destroyed
a
Order a factory repair kit and replace the seals.
4
Faulty solenoid valve
a
Check to see whether the manual override button on
the solenoid valve actuates the cylinder
5
Cleaning disc not cleaning the filter screen
a
Inspect and clean the filter screen.
b
Inspect and replace the cleaning disc.
B
Purge valve will not operate properly
1
No power
a
Check to see if the filter system is receiving adequate
power.
b
Check to see if the filter system is set to the proper
voltage.
c
Check all wiring connections.
2
No air
a
Check to see if the filter system is receiving adequate
air.
b
Check for air leaks.
c
Check to see if the air bleed valve is closed and the air
block valve is open.
d
Check to see if the air lines are connected to the
correct ports.
3
Actuator seals have been destroyed
a
Order a factory repair kit and replace the seals.
4
Faulty solenoid valve
a
Check to see whether the manual override button on
the solenoid valve actuates the cylinder
5
Damaged purge valve
a
Replace or rebuild purge valve
6
Debris caught in purge valve
a
Remove debris from purge valve
C
Leakage at lid seal
1
Loose lid nuts/bolts
a
Tighten lid/nut bolts to
2
Dirty lid sealing surfaces
a
Clean lid sealing surfaces
3
Damaged sealing surfaces
a
Repair or replace filter station
4
Worn lid O-ring
a
Remove and replace with factory lid O-ring
D
Leakage where drive shaft enters lid
1
Damaged or worn drive shaft seal
a
Inspect and replace the drive shaft seal
E
Reduction in flow rate or high differential pressure
1
Purge time too long
a
Decrease purge timer setting
2
Purge valve not functioning
a
Inspect and replace purge valve
3
Dirty or damaged filter screen
a
Inspect and clean or replace filter screen
4
Flow, viscosity or solids increase
a
Consult factory
5
Cleaning disc not cleaning
a
Inspect cleaning disc for wear and replace if necessary
F
Drop in filtrate quality
1
High differential pressure
a
Refer to reduction in flow rate or high differential
pressure above
2
Damaged filter screen O-rings
a
Remove and replace with factory filter screen O-rings
3
Damaged filter screen
a
Remove and replace with factory filter screen
4
Filter screen too coarse
a
Consult factory for ability of filter system to accept a
finer screen retention. Remove and replace with
factory filter screen.
