Sumitomo SHI 610: Nozzle Contact Force Loss — Alarm & Fix
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
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 |
|---|---|
| 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.
Related Diagnostics & Materials
Netstal Alarm 102: Heating Zone Temperature Out of Range...
Netstal Alarm 102 occurs when the actual temperature of a specific heating band in the injection barrel deviates...
Arburg Error 320: Barrel Heating Control Failure -...
Arburg Error 320 is a critical interlock alarm triggered when the Selogica controller detects no current flow to one...
Engel Alarm 405: Screw Recovery Time Exceeded - Diagnostics & Fix
Engel Alarm 405 is generated by the CC300 controller when the screw recovery (plastication) time exceeds the maximum...
Netstal Alarm 301: Mold Protection Force Exceeded -...
Netstal Alarm 301 is one of the most critical safety alarms in injection molding—it triggers when the clamping unit...
Sumitomo Demag Alarm 220: Clamp Force Not Reached -...
Sumitomo Demag Alarm 220 triggers when the NC5 (or NC5 plus) controller detects that the actual clamping force...
KraussMaffei Alarm MC45: Injection Pressure Limit...
KraussMaffei Alarm MC45 is generated by the MC6 controller (KM's latest-generation control platform) when the...
Wittmann Battenfeld Alarm B6: Ejector Position Fault -...
Wittmann Battenfeld Alarm B6 triggers on the Unilog B8 (or B6/B6P) controller when the ejector system fails to reach...
Arburg Error 290: Screw Rotation Speed Deviation -...
Arburg Error 290 is triggered by the Selogica controller when the actual screw rotation speed (measured by the screw...
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