Sumitomo SHI 610: Nozzle Contact Force Loss — Alarm & Fix
Tensile data verified against MatWeb.com database & manufacturer datasheets · Last updated July 2026
Published: 2026-06-02
Sumitomo SHI 610 alarm triggers when the nozzle contact force sensor detects loss of contact between the machine nozzle and the mold sprue bushing during injection. This is a critical safety and quality alarm — loss of nozzle contact causes...
Sumitomo SHI 610 alarm triggers when the nozzle contact force sensor detects loss of contact between the machine nozzle and the mold sprue bushing during injection. This is a critical safety and quality alarm — loss of nozzle contact causes molten plastic to leak at the nozzle/sprue interface, creating a safety hazard (high-pressure spray of molten material) and producing short shots. The nozzle contact force is maintained by the injection carriage hydraulic cylinder; loss of force indicates either hydraulic pressure decay or mechanical obstruction of the carriage.
Troubleshooting sequence: 1. Verify hydraulic pressure to the injection carriage cylinder — if pressure is below spec, check hydraulic pump, proportional valve, and pressure relief settings. 2. Inspect carriage linear guides for contamination or binding — plastic granules, dust, or degraded grease on the guide rails can cause intermittent resistance. 3. Check the nozzle radius and sprue bushing radius match — a 15mm radius nozzle against a 12mm sprue bushing creates a line contact that leaks. Both must match (standard radii: 10, 12.5, 15, 20mm). 4. Verify that the mold is properly centered on the platen — an offset mold causes the sprue bushing to misalign with the nozzle centerline.
Alarm Details
| Alarm Code | 610 |
|---|---|
| Brand / Machine | Sumitomo Heavy Industries |
| Severity | High (Cycle Stop) |
| Component | Injection Carriage / Nozzle Touch |
| Affected Systems | Injection Unit Carriage |
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 Heating Band | SHI-HB-{zone} | $380-720 |
| Sumitomo Thermocouple | SHI-TC-{zone} | $100-210 |
| Sumitomo S-Cube Controller | SHI-SC-CTRL | $1,000-2,000 |
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 |
|---|---|
| Toshiba EC 8502 |
Frequently Asked Questions
What is the correct nozzle contact force?
Typically 3-5 kN for machines up to 100 tons, 5-10 kN for 100-300 tons, and 10-20 kN for 300+ tons. Insufficient force causes leakage; excessive force can damage the mold sprue bushing or machine nozzle tip. Check your machine's setup sheet for model-specific recommendations.
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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