What causes fault code CONV-ALIGN1 (Conveyor Belt Alignment — Critical Drift)?

Material buildup on one side of head or tail pulley — belt tracks toward the buildup. Pulley lagging worn unevenly — one side has more grip than the other. Idler roller seized on one side — belt pulled toward the seized roller. Belt splice not straight — angled splice causes belt to walk to one side. Conveyor frame not square or level — foundation settlement

How do I fix fault code CONV-ALIGN1?

Stop conveyor and inspect belt edges for fraying, cutting, or delamination. Clean head and tail pulleys — scrape off any material buildup. Check all idler rollers by hand — spin each one, feel for seized bearings. Adjust tail pulley tracking bolts — move the side the belt is tracking TOWARD by 1/4 turn. Run conveyor at slow speed and observe — make incremental 1/4 turn adjustments, wait 3 full belt rotations between adjustments. If belt continues to drift, check belt splice — a crooked splice will never track straight

Conveyor Belt Alignment — Critical Drift

CONV-ALIGN1

Belt has drifted significantly off-center and is rubbing against the frame or has triggered the belt alignment switch. Risk of belt edge damage and product falling off conveyor.

medium conveyor

conveyor belt alignment tracking pulley drift

Probable Causes (ranked)

Material buildup on one side of head or tail pulley — belt tracks toward the buildup
Pulley lagging worn unevenly — one side has more grip than the other
Idler roller seized on one side — belt pulled toward the seized roller
Belt splice not straight — angled splice causes belt to walk to one side
Conveyor frame not square or level — foundation settlement

Fix Steps

1 Stop conveyor and inspect belt edges for fraying, cutting, or delamination
2 Clean head and tail pulleys — scrape off any material buildup
3 Check all idler rollers by hand — spin each one, feel for seized bearings
4 Adjust tail pulley tracking bolts — move the side the belt is tracking TOWARD by 1/4 turn
5 Run conveyor at slow speed and observe — make incremental 1/4 turn adjustments, wait 3 full belt rotations between adjustments
6 If belt continues to drift, check belt splice — a crooked splice will never track straight

Field Trick

The belt always tracks toward the tight side. If the belt drifts to the left, the left side of the tail pulley is tighter than the right. Loosen the left snub bolt 1/4 turn (or tighten the right 1/4 turn). Always adjust at the TAIL pulley for tracking, not the head.

Suggested Replacement Parts

Parts matched to fault category: Conveyor Belt

Intralox Series 400 Flat Top Belt (per ft) P/N: S400-FT-12 12 inch wide, acetal flat top, food-grade option available

McMaster-Carr $35.00 Grainger $42.00 Amazon $30.00

Prices are estimates. Verify part numbers match your equipment before ordering.

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