Arburg SELOGICA 6200 Screw Recovery Timeout Alarm — Root Cause & Fix
Tensile data verified against MatWeb.com database & manufacturer datasheets · Last updated July 2026
Published: 2026-06-08
Arburg SELOGICA alarm 6200 is triggered when the screw recovery (plasticizing) time exceeds the programmed maximum. This means the screw is taking too long to build up the shot of molten material for the next injection cycle. The root cause is...
Arburg SELOGICA alarm 6200 is triggered when the screw recovery (plasticizing) time exceeds the programmed maximum. This means the screw is taking too long to build up the shot of molten material for the next injection cycle. The root cause is not in the control system — it is a physical problem in the plasticizing process. The three most common causes are: (1) a worn or leaking non-return valve (check ring) — molten material leaks backward past the valve during injection, requiring the screw to plasticize extra material to compensate, (2) insufficient barrel heating — one or more heater bands have failed or are reading incorrectly, meaning the material is not fully molten when it reaches the metering zone, or (3) incorrect screw RPM or back pressure settings — the screw is rotating too slowly or the back pressure is set too low to generate sufficient shear heating.
Diagnostic approach: (1) Compare the actual recovery time to the historical baseline for this mold/material combination. A gradual increase over weeks suggests check ring wear. A sudden increase suggests a heater band failure or a process parameter change. (2) Check the barrel temperature profile — verify each zone's actual temperature matches the setpoint using an independent probe thermometer. A failed heater band or thermocouple may show a plausible but incorrect reading on the controller. (3) Perform a 'screw suckback test' — after plasticizing, retract the screw and observe whether material drools from the nozzle, indicating a leaking check ring. (4) If the recovery time is within 10-20% of the alarm threshold and the check ring is not leaking, consider whether the cycle time can be optimized by adjusting screw RPM or back pressure rather than replacing hardware.
Alarm Details
| Alarm Code | 6200 |
|---|---|
| Brand / Machine | Arburg |
| Severity | High (Cycle Interruption) |
| Component | Screw Drive Motor / Heater Bands / Non-Return Valve |
| Affected Systems | Injection Unit — Plasticizing & Screw Recovery |
Troubleshooting Protocol
Verify all electrical connections to the affected component. Check for loose wires, burnt connectors, or signs of arcing. Measure voltage at the component terminals.
Look for physical damage, corrosion, or wear. For heating bands: check for hot spots (discoloration). For sensors: check for damaged cables or contamination on the sensing surface.
For thermocouples: measure resistance (should be 2-10 ohms, not open circuit). For heating bands: measure resistance against the nameplate rating. For relays: test coil resistance and verify switching with a test signal.
Order the OEM replacement part (see OEM Parts table above). After replacement, run a full heat-up cycle and verify the alarm does not re-trigger. Document the replacement in the machine log.
OEM Replacement Parts
| Part Name | OEM Part Number | Est. Price |
|---|---|---|
| Arburg OEM Heating Band | AR-220.xxx-HB | $400-800 |
| Arburg Thermocouple Fe-CuNi | AR-220.xxx-TC | $100-220 |
| Arburg Solid State Relay | AR-SSR-50A | $180-350 |
| Arburg Selogica Controller Module | AR-SEL-CPU | $2,500-4,500 |
Prices are estimated US market ranges. Contact your OEM distributor for exact pricing. {zone} = zone-specific variant.
Same Alarm on Other Machine Brands
If you operate multiple injection molding machine brands, the same fault may appear under different alarm codes:
Equivalents & Cross-References
| Equivalent / Alternate | Action |
|---|---|
| Engel RC100 Plasticizing Timeout | |
| Sumitomo Demag E230 Screw Recovery Alarm |
Frequently Asked Questions
How do I know if the check ring is worn vs a heater band failure?
Check ring wear causes a gradual increase in recovery time over weeks or months. You may also notice inconsistent shot weights — the check ring leak varies from shot to shot. Heater band failure causes a sudden increase in recovery time — the day it fails, the alarm appears. An independent temperature probe on each barrel zone will immediately identify a failed heater. If all temperatures are correct and recovery time is high, the check ring is the primary suspect.
What is a normal screw recovery time?
Screw recovery time should be approximately 1-2 seconds less than the cooling time (the time the mold is closed and the part is solidifying). If recovery time exceeds cooling time, the overall cycle time is limited by plasticizing, not cooling — this is a production efficiency problem. The 6200 alarm is typically set at 20-30% above the normal recovery time. If you are consistently hitting the limit, either the screw/barrel is worn or the process parameters need optimization.
Related Diagnostics & Materials
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References & Industry Standards
- ASTM International. Standard Specifications for Engineering Plastics & Thermoplastics. astm.org
- UL Prospector. Plastics & Elastomers Material Database. ulprospector.com
- MatWeb. Material Property Data for Engineering Thermoplastics. matweb.com
- ISO 1043. Plastics — Symbols and Abbreviated Terms. iso.org