SKF SFD - Page 25

Troubleshooting SFD Dryer Systems cont’d
Possible Cause Remedy Kit ID's
Micro logic timer (MLT) malfunctioning
Ensure MLT is connected to surge protected power source
Air control valve malfunction, i.e., leaking
Air Control air vents clogged (plugged)
Air tubing connecting air control valve and valve
housing and/or manifold damaged or missing
Replace air control valve E
Possible Cause Remedy Kit ID's
Desiccant cartridges require service Replace desiccant cartridges - service kit A
Air flow restriction
Possible Cause Remedy Kit ID's
Desiccant cartridge contaminated Replace desiccant cartridges - service kit A
Micro Logic Timer (MLT) malfunctioning Replace MLT G
Air control valve malfunctioning Replace air control valve assembly E
Regeneration valve malfunctioning Replace regeneration valves C
1/4" tubing connecting air control valve and valve
housing and/or manifold damaged or missing
Repair or replace ¼ air line tubing
Worn, stuck or clogged purge valve Replace purge valve assemblies D
Purge Valves incorrectly serviced
Align exhaust ports in purge valve as detailed within
service kit instructions
Compressed air usage exceeds drying capacity of
dryer system
Contact SKF Customer Service 1 888 SKF FIRST
Possible Cause Remedy
Ensure air pressure though pilot signal line
Disconnect one ¼ air line at a time from PLC checking for
steady air flow during a regeneration cycle. If not replace
PLC
¼ tubing connecting air control valve and valve
housing and/or manifold damaged or missing
Air Control air vent clogged (plugged)
Repair or replace ¼ air line tubing and check all fittings for cracks or
leaks
Note: Brass screw (slot) must be in vertical (12 - 6 o'clock) run position
Water in air system (all models)
Replace ¼ air line tubing
Clean air control vents
Dryer will not cycle (switch) every two minutes w/Micro Logic Timer
Contact SKF Customer Service 1 888 SKF FIRST
Inadequate air flow (volume) down stream from air dryer (all models)
Test: Unplug timer, manually cycle dryer by turning brass screw
several times in valve assembly to 2 o’clock (1/4 turn right) and back
to 12 o’clock position. If dryer cycles replace MLT
G
Replace MLT timer
Dryer will not cycle (switch) every 45 seconds (Programmable Logic Control PLC Models Only)
Ensure PLC is connected to power source (green light)
Q
Test: Unplug timer, manually cycle dryer by turning brass screw
several times in valve assembly to 2 o’clock (1/4 turn right) and back
to 12 o’clock position. If dryer does not cycle replace air control
valve
Clean air control vent
Brass Screw
Vents
Programmable Control
Box (PLC)
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