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4 TROUBLESHOOTING
The Walinga airlock delivers long periods of trouble-free operation when operated and serviced
correctly. This trouble-shooting guide will help identify and solve operating problems if they occur.
ISOLATE THE AIRLOCK FROM YOUR POWER SUPPLY
Operating Problem
4.1 Rotor Grinds During
Operation
4.1.1) Rotor Blade Tips not fully
seated after adjustment
4.1.2 Incorrect Direction of
Rotation
4.1.3 Bearing Failure
4.2 Airlock Stalls Or Motor
Overloads
bstruction in Airlock
4.2.1 O
Prevents Blade Rotation
WARNING -
BEFORE CLEARING OR ADJUSTING
Possible Cause & Recommended Action
It is normal to hear a light grinding noise for several hours after
adjustment of the airlock tip clearances. This noise will
disappear after the tips seat fully on the casing.
If the noise is excessive the tips may be adjusted too tight
against the casing. Re-adjust tip clearances as described in
the Maintenance section.
The airlock is designed to operate continuously in one direction
only. Check that the shaft rotates in an counter clockwise
direction when viewed from the driven end of the unit.
Continuous operation in reverse will cause excessive wear and
may damage the rotor tips, tip wiper, casing and bearings.
Remove bearing cover plates at each end of the airlock .Follow
normal ball bearing replacement practices.
If equipped with tapered bearings, ensure that the bearings
and housings are fully packed with grease before replacing
covers.
Always re-check clearances between end of rotor blades
and end plates after replacing bearings. See maintenance
section for guidance.
(a) For units with Reversible Speed Controller: Change the
rotational direction of the airlock briefly then return to correct
direction. Repeat this several times until the object (for
example, bolts or metal) falls sideways into the blade area and
clears. If this fails, move to (b) ...
Caution: Changing the direction of rotation by reversing the
wiring on 3-phase electric motors is not recommended.
Impact damage may result.
(b) For units without Reversible Speed Controller: Isolate the
power supply to the unit - Essential! Remove obstruction
manually. Access obstruction through an inlet or discharge
opening (after removing piping or ducting) or via an inspection
hatch if provided. If still unable to clear the obstruction, remove
the complete airlock unit for attention.
7
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