| S.No | Code | Fault | Cause | Corrective Action |
|---|---|---|---|---|
| 1 | VM-01 | Screen will not start | Power failure. | Check power supply. |
| Starter inoperative. | Check fuses, breakers, holding coil, control panel. | |||
| Motor does not operate. | Refer to VM-02, VM-03 | |||
| Shaft assembly or vibrator assembly frozen or damaged. | With drive belts removed check vibrator mechanism for freedom to rotate; see bearing trouble. | |||
| 2 | VM-02 | Motor does not operate | Material interference with screen body or motor base. | Clear build up from screen body or motor base. |
| Insufficient line voltage | Check electrical supply for sufficient line voltage. | |||
| Fuse or circuit breaker blown. | Replace or reset. | |||
| Motor coil burn out | Rewind coil | |||
| Defective power cable. | "Check cable for broken conductors replace if defective | |||
| 3 | VM-03 | Motor hums but does not start. | Defective motor. | Replace defective motor |
| Bearing lubricant too heavy. | Clean bearings and relubricate with proper lubricant | |||
| "Bearing frozen or damaged.
Motor too small." | "Replace damaged bearing. Install correct size motor" | |||
| 4 | VM-04 | Motor overheats. | Incorrect bearing lubricant. | Clean bearings and relubricate with proper lubricant. |
| "Motor wired incorrectly. Motor too small." | "Correct wiring consult MFG. for proper size." | |||
| Bearing failure | Replace damaged bearing. | |||
| Defective motor | Replace or rewind defective motor. | |||
| Power circuit wire too small. | Install power circuit with correct wire size | |||
| Power circuit overloaded. | "Install heavier circuit or reduce load on power circuit. | |||
| Trouble with vibrator assembly. | Refer to vibrator sections. | |||
| 5 | VM-05 | Overheating of Vibrator Housing | Too little lubricant. | Check for leakage, damaged seals, relubricate. |
| Too much lubricant | Remove lubricant to proper level, allow lubricant to purge from system if so designed. | |||
| Improper lubricant. High ambient temperature, hot material, hot environment | "Replace with proper lubricant. Ventilate area, use high temperature lubricant, consult manufacturer." | |||
| Bearing failure. | Replace bearing | |||
| Improper bearing clearance. | Replace bearing, and check for contamination in lubricant. | |||
| Material build-up on bearing housings. | Remove build-up. | |||
| Insufficient clearance on Labyrinth seals. | Check seal clearances. | |||
| 6 | VM-06 | Vibrator will not rotate. | Motor inoperative. | Refer to VM-02, VM-03 |
| Bearing or seal components frozen or damaged | Replace damaged bearings or seals. | |||
| Lubricant too heavy. | Remove lubricant, relubricate with recommended lubricant | |||
| Drive belts are loose. | Tighten V-Belts | |||
| Vibrator assembled incorrectly. | Review assembly procedure. | |||
| 7 | VM-07 | Lubricant leakage. | Excessive operating temperature. | "Use high temperature lubricant. Consult screen manufacturer." |
| Excessive lubricant. | Restore lubricant to proper level | |||
| Drain plugs omitted. | Install drain plugs. | |||
| Damaged or worn seals. | Inspect seals and replace. | |||
| 8 | VM-08 | Noisy bearing | Bearing failure. | Refer VM-09. |
| Improper bearing assembly | "Replace housing, bolts and properly torque, check bearing, insure that damage to the housing or fastener holes hasn't occurred. Make sure bearing is not turning in the housing. " | |||
| Improper bearing clearance | Consult screen manufacturer. | |||
| 9 | VM-09 | Bearing failures | Normal fatigue failure. | Replace bearing according to manufacturer's assembly instructions |
| Overloading, excessive stroke or speed combination. | Return screen to original operating mode and replace bearing. | |||
| Overheating from lack of lubricant, excessive lubricant or high ambient temperature, incorrect lubricant. | Restore correct lubricant level; use lubricant recommended for the ambient temperature, replace bearing, use correct lubricant | |||
| Spalling from dirt or water entering bearing. | "Flush housings and lubrication system, replace bearing and replace or clean air breathers, seals. | |||
| Brinnelling from storage in an area where vibration is present, loose bearing housing, or dropping screen or bearings. | Replace bearing and correct cause. | |||
| Improper float or allowance for expansion in vibrator assembly. | Replace bearing; reassemble per the manufacturer's instructions. | |||
| Arcing through the bearing during welding with improper ground | Always ground properly. | |||
| 10 | VM-10 | Excessive structure vibration. | Support structure too weak. | Add structural support. |
| Shipping blocks not removed. (Connecting flat in the springs upper and lower bracket) | Remove shipping blocks | |||
| Insufficient clearance between screen and structure or material build-up | Provide adequate clearance and/or remove build-up material. | |||
| Fatigued suspension parts. | Replace components and check other components for damage. | |||
| 11 | VM-11 | Excessive screen vibration. | Screen out of balance. | See out-of-balance troubles. |
| "Damaged suspension. Screen operating speed too fast. Wrong stroke/speed combination" | "Replace damaged parts. Return screen to original operating mode; Consult manufacturer." | |||
| Improper or surge feeding. | Control feed of material. | |||
| 12 | VM-12 | Erratic vibration. | Slipping drive belts, or over tensioned drive belts. | "Adjust belts per the manufacturer's recommendation. Replace worn, frayed or stretched belts. " |
| Voltage drop. | Check power supply. | |||
| Broken suspension parts. | Replace suspension parts | |||
| Throwing of drive belts | "Check belt alignment, check snubbers or plugging parts. Check belt lengths" | |||
| Loose drive or body bolts. | Replace or properly torque bolts. | |||
| Screen operating near the natural frequency of the support structure. | Install brace on the supports. | |||
| Screen operating at or near critical speed. | Change speed per manufacturer's recommendations. | |||
| Counterweight settings changed and do not match. | Match counterweights. | |||
| 13 | VM-13 | Excessive Screen cloth breakage. | Incorrect screen tension. | Periodically check screen tension system. |
| Corrosive material. | Switch to corrosion resistant cloth. | |||
| Worn tension rails; insufficient to support bolting pressure | Replace tension rails. | |||
| Loose screen media bolts. | Properly torque or replace. | |||
| Unbalanced feed condition or feed concentrated at one point. | Distribute feed evenly across surface. | |||
| Worn buffer support rubber. | Replace as required. | |||
| 14 | VM-14 | Insufficient screening. | Screen blinding, or plugging. | Refer VM-16. |
| Material feed exceeds design capacity. | Decrease feed rate. | |||
| Screen media open area too little. | Use media with more open area. | |||
| Material travel rate across screen too rapid. | "Change feed configuration. Operate screen counterflow and decrease feed rate" | |||
| Material feed analysis different than originally defined for duty | Adjust openings, feed rate, travel rate, direction of Flow. | |||
| Stroke reduction due to material build-up | Remove build-up. | |||
| 15 | VM-15 | Excessive fines in oversize. | Material travel rate too rapid. | Reduce screen angle or operate counterflow. |
| Improper distribution of feed material. | Revise feed arrangement. | |||
| Excessive feed. | Reduce feed. | |||
| Unit operating out of balance. | Restore Balance. | |||
| Excessive throw for media opening. | Adjust speed/throw to deck opening. | |||
| Operating speed below recommended. | Restore proper speed. | |||
| Moisture piggyback of fines. | "Dry material prior to screening. Wash material during screening." | |||
| Bearing failing. | Replace bearing. | |||
| Opening too small. | Use larger opening. | |||
| Insufficient open area. | Use media with more open area. | |||
| 16 | VM-16 | Screen blinding or Plugging. | Inclined screen too flat. | Increase angle of operation. |
| Material moisture. | "Change cloth size or type. Dry material prior to screening. " | |||
| Wrong deck preparation. | Use different screening media. | |||
| Carrot shaped particles plugging openings. | "Adjust crusher setting Larger stroke required; consult manufacturer." | |||
| Screen operating speed may be slow. | Increase speed at manufacturer's recommendation | |||
| Excessive near size particles in feed. | Adjust crusher openings to reduce near size. Use different opening. | |||
| Shaft rotating in wrong direction. | Reverse shaft rotation. | |||
| Loose screening media. | Periodically check tension or integrity of screen media. | |||
| 17 | VM-17 | Screen out of balance | Material build-up on screen. | Remove build-up. |
| Installation of heavier screen media than originally furnished. | Rebalance screen. Consult mfg. | |||
| Chutes, hoppers added to screen body. | Remove chutework additions. | |||
| 18 | VM-18 | Material travels diagonally across screen | Drive belts too tight | Adjust drive belts. |
| Main bearing failure | Replace bearing | |||
| Damaged suspension. | Repair suspension. | |||
| Screen out of level - side to side. | Level screen. | |||
| Machine racking or off motion. | See racking trouble. | |||
| Unevenly balanced vibrator weights. | Match vibrator weights. | |||
| 19 | VM-19 | Machine racking. | Loose body components or bolts. | Retighten all body fasteners. |
| Damaged suspension. | Repair suspension. | |||
| Broken or damaged structural members, broken welds. | Replace non-conforming parts. | |||
| Operating at or near critical speed. | Consult manufacturing. | |||
| 20 | VM-20 | Fatigue failure of screen body. | Field modifications by user, welding, cutting, etc., which concentrate abnormal stresses. | Include design requirements in initial specification. Replace failed components |
| Corrosion and wear. | Replace damaged parts. | |||
| Screen operating out of balance. | Restore balance. | |||
| Operating screen at or near critical speed. | Change speed, Consult MFG. See erratic vibration section. | |||
| Excessive feed rate. | Reduce feed. | |||
| Oversize feed materials. | Reduce maximum size of feed. | |||
| Interference w/structure or material build-up. | Eliminate interference of build-up. | |||
| 21 | VM-21 | Material travels in wrong direction. | Screen installed too flat. | Consult manufacturer. |
| Unit running in wrong direction. | Reverse motor direction |
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