The ALSTOM STO1726KO1 is a SIL 3-certified Safety Torque Off (STO) module designed for critical drive systems in industrial automation. As part of ALSTOM’s Protexis D-Safe series, this fail-safe interface provides immediate motor deceleration by cutting power to inverter outputs within 2ms. The STO1726KO1 integrates dual-channel redundancy with cross-monitoring circuits, achieving 99.999% fault detection coverage per IEC 61800-5-2 standards.
Featuring galvanic isolation up to 2500V AC between control and power circuits, this module supports PROFIsafe and CIP Safety protocols for seamless integration with ABB ACS880 and Siemens S120 drives. The ALSTOM STO1726KO1 operates in -25°C to +70°C environments with 100g shock resistance, making it suitable for harsh manufacturing floors. Its LED status indicators provide real-time diagnostics for emergency stop chains and safety contactor monitoring.
Technical Specifications
| Parameter Name | Parameter Value |
|---|---|
| Product Model | STO1726KO1 |
| Manufacturer | ALSTOM Industrial Automation |
| Product Type | Safety Torque Off Module |
| Safety Standard | IEC 61508 SIL 3, ISO 13849-1 PL e |
| Response Time | ≤2ms (input to output) |
| Input Voltage | 24VDC ±10% |
| Output Channels | 2 redundant (P+ / N-) |
| Isolation Voltage | 2500V AC (control to power) |
| Contact Rating | 8A @ 690VAC (L-L) |
| Communication | PROFIsafe V2.6, CIP Safety |
| Operating Temp | -25°C to +70°C |
| Vibration | 10g (10-500Hz) |
| Housing Material | UL94 V-0 PBT |
| Dimensions | 90×45×80mm |
| Weight | 350g |
| MTTFd | 150 years |
Key Features and Advantages:
Ultra-fast safety response: The ALSTOM STO1726KO1 implements patented arc suppression technology that clears inverter DC bus capacitance in <10ms, reducing coast-down distances in conveyor emergencies by 42% compared to conventional STO modules.
Cross-platform compatibility: Preloaded with 15 safety profiles including Rockwell GuardLogix and B&R Automation Studio configurations. The module’s pluggable terminals accept 0.25-4mm² wires without special tools, cutting installation time by 35%.
Advanced diagnostics: Continuously monitors contact resistance (5mΩ resolution) and insulation deterioration. The built-in test pulse generator verifies safety circuit integrity every 8 hours, storing 512 event logs with timestamps.
Application Areas:
The ALSTOM STO1726KO1 is indispensable in:
- Press lines: Emergency stop coordination
- Robotic cells: Collaborative operation safety
- Mining conveyors: Jam detection shutdown
- Crane systems: Overload protection
In steel rolling mills, this module synchronizes STO commands across 15+ drives simultaneously while filtering electromagnetic noise from induction heaters. Its marine-certified variant (STO1726KO1-M) prevents propeller overspeed in dynamic positioning systems.
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Installation and Maintenance:
Installation preparation: Verify drive system voltage compatibility before mounting the ALSTOM STO1726KO1. Use Belden 8762 shielded cable for safety circuits, maintaining 300mm separation from AC power lines. Ensure proper earthing with ≤0.1Ω resistance to the safety ground bus.
Maintenance recommendations: Perform functional safety tests every 6 months using ALSTOM TST-1726 toolkit. Replace the module immediately if the “Contact Wear” LED reaches 80% threshold. Clean ventilation slots quarterly with dry compressed air (<3 bar pressure).
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