Sumitomo Demag Alarm 505: Check Ring Leakage Detected
Tensile data verified against MatWeb.com database & manufacturer datasheets · Last updated July 2026
Published: 2026-06-02
Sumitomo Demag 505: ActiveLock detects check ring leakage via pressure decay analysis. Causes: worn check ring seat, polymer residue preventing seating, or incorrect ring type for material.
Sumitomo Demag 505: ActiveLock detects check ring leakage via pressure decay analysis. Causes: worn check ring seat, polymer residue preventing seating, or incorrect ring type for material.
Alarm Details
| Alarm Code | 505 |
|---|---|
| Brand / Machine | Sumitomo Demag |
| Severity | Medium (Quality Alarm) |
| Component | Check Ring / Screw Tip |
| Affected Systems | Injection Unit |
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 |
|---|---|---|
| Sumitomo Demag Heating Band | SD-HB-{zone} | $400-750 |
| Sumitomo Demag Thermocouple | SD-TC-{zone} | $110-240 |
| Sumitomo Demag NC5 Controller Card | SD-NC5-TC | $1,000-2,200 |
| Sumitomo Demag SSR Module | SD-SSR-40A | $200-400 |
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 |
|---|---|
| Arburg 290 |
Frequently Asked Questions
Confirm leakage?
Free-air injection test: inject into air, weigh shot. If >5% below target consistently, check ring is leaking. Replace ring and seat as matched set.
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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