Demag D-150 Alarm: Injection Time Exceeded — Troubleshooting
Published: 2026-06-02
Sumitomo Demag D-150 alarm indicates that the injection time — the time from injection start to reaching the switchover point (typically by screw position or injection pressure) — exceeded the programmed maximum value. This means the material did...
Sumitomo Demag D-150 alarm indicates that the injection time — the time from injection start to reaching the switchover point (typically by screw position or injection pressure) — exceeded the programmed maximum value. This means the material did not fill the cavity within the expected time. The most common cause: material viscosity higher than expected due to inadequate drying, incorrect melt temperature, or a restricted flow path (blocked nozzle tip, frozen gate, or undersized sprue/runner).
Diagnostic decision tree: 1. Monitor injection pressure curve — if pressure is climbing but position is advancing slowly, the restriction is in the flow path. If pressure is low and position is slow, the screw is not generating sufficient flow (check ring leak, screw wear, or inadequate barrel heating). 2. Purge into free air — if purge time is normal, restriction is in the mold. If purge time is also slow, the problem is in the injection unit (material feed, screw condition, or temperature). 3. Verify screw recovery time — a worn screw with large clearance between screw flights and barrel wall reduces pumping efficiency, increasing both plasticating time and injection time.
Alarm Details
| Alarm Code | D-150 |
|---|---|
| Brand / Machine | Sumitomo Demag |
| Severity | Medium (Cycle Abort) |
| Component | Injection Unit / Screw & Barrel |
| Affected Systems | Injection Speed Control |
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 |
|---|---|
| Arburg E290 | |
| Netstal 405 |
Frequently Asked Questions
How do I diagnose a worn check ring vs a blocked nozzle?
Perform a screw-recovery test: time how long the screw takes to recover to shot size at normal RPM and back pressure. A worn check ring causes inconsistent shot size (+/- 3-5mm variation) and longer recovery time because material leaks backward during injection. A blocked nozzle causes normal recovery but high injection pressure — purge the nozzle to confirm.
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