Engel Alarm 405: Screw Recovery Time Exceeded - Diagnostics & Fix
Published: 2026-05-26
Engel Alarm 405 is generated by the CC300 controller when the screw recovery (plastication) time exceeds the maximum time set in the injection molding cycle parameters. This is not an emergency stop alarm—it is a cycle deviation warning that...
Engel Alarm 405 is generated by the CC300 controller when the screw recovery (plastication) time exceeds the maximum time set in the injection molding cycle parameters. This is not an emergency stop alarm—it is a cycle deviation warning that indicates the plasticizing unit is not delivering molten polymer to the shot chamber at the expected rate.
Root cause analysis follows the polymer flow path backward from nozzle to feed throat: (1) Nozzle orifice partially blocked by degraded polymer or cold slug—check nozzle temperature and purge. (2) Check ring (non-return valve) worn or cracked—allows melt backflow during injection, requiring longer screw recovery to compensate. (3) Barrel temperature set-points too low for the material—verify actual vs set temperatures with a needle pyrometer (thermocouples measure steel temperature, not melt temperature). (4) Screw wear—increased clearance between screw and barrel reduces plasticating efficiency; measure shot weight consistency over 20 cycles. (5) Feed throat bridging—granules not flowing into the screw flights due to moisture or static—check hopper and feed throat temperature. (6) For hydraulic machines: worn pump not delivering design flow rate at required pressure.
Alarm Details
| Alarm Code | 405 |
|---|---|
| Brand / Machine | Engel |
| Severity | Medium (Cycle Delay / Warning) |
| Component | Screw Drive Motor / Hydraulic Pump |
| Affected Systems | Plasticizing Unit / CC300 Controller |
Troubleshooting Protocol
Identify which zone/component triggered the alarm. Record the error code, timestamp, and any measured deviation values shown on the diagnostic screen.
Power down the machine and follow Lock-Out Tag-Out procedures. Visually inspect the affected component for physical damage, loose connections, polymer leakage, or carbonized material.
Using a multimeter, check resistance/continuity on the affected circuit. Verify SSR functionality and fuse integrity. Compare readings to OEM specifications.
Replace the failed component with an OEM-approved part. Do not substitute with generic equivalents unless validated for the specific machine model and operating conditions.
Restart the machine, verify the alarm is cleared, run a test cycle, and document the root cause, repair performed, and parts replaced in the machine maintenance log.
Equivalents & Cross-References
| Equivalent / Alternate | Action |
|---|---|
| Netstal Alarm 102 | |
| Arburg Error 320 |
Frequently Asked Questions
How can I monitor screw recovery time trend to predict check ring failure?
On Engel CC300 controllers, navigate to Process Monitoring > Trends > Screw Recovery Time. Plot recovery time against cycle count over the last 500-1000 cycles. A gradual upward trend (e.g., 2.5s → 3.2s → 4.1s over 3 shifts) indicates progressive check ring wear allowing increasing melt backflow. A sudden step change (2.5s → 5.1s in one cycle) indicates a catastrophic check ring failure (cracked ring or broken seat). Schedule preventive check ring replacement when recovery time increases 25% above baseline—before Alarm 405 thresholds are reached.
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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