Industry Insights AseanVolt 09 Apr 2026 views ( )

Collaborative Robot Cycle Time Slowing Production? How Oversized Safety Zones Impact Efficiency

The promise of collaborative robots (cobots) is seamless integration and flexible, efficient assistance for human workers. However, a common and frustrating post-deployment issue arises: the anticipated cycle time improvement isn't realized, and the process may even be slower. Often, the culprit isn't the robot itself, but an overly conservative and improperly configured safety system, specifically Safety-Rated Monitored Stop (SRMS) zones or speed and separation monitoring zones that are too large. For procurement specialists and operations managers sourcing automation, understanding this technical pitfall is crucial for protecting your investment and achieving the promised return.

The Efficiency Trade-Off in Safety Configuration

Cobots are designed to operate safely alongside humans without traditional cages. This safety is managed through software-defined zones. When a human enters a "reduced speed" or "stop" zone, the cobot slows or halts. If these zones are set excessively large—a common default or a risk-averse choice during commissioning—the robot spends a significant portion of its cycle time operating at reduced speed or waiting for clearance, destroying throughput. The key is finding the precise, compliant balance where safety is maintained without sacrificing efficiency.

Procurement & Integration Checklist: Specifying for Optimal Performance

To avoid this issue, build these requirements into your sourcing and procurement process:

1. Supplier Qualification: Vet integrators and cobot OEMs on their experience with performance validation. Ask for case studies or references where they optimized cycle time post-deployment. They should understand ANSI/RIA R15.08 and ISO/TS 15066 standards intimately, not just for compliance but for efficient application.

2. Technical Specifications: In your RFQ, move beyond just payload and reach. Require a pre-deployment risk assessment and zone mapping proposal. The bid should detail how they plan to define and validate zone boundaries using actual human presence detection (e.g., laser scanners, vision systems) to minimize unnecessary intrusions.

3. Validation Clause: Include a contractual performance benchmark. The system must achieve a target cycle time under normal operating conditions after safety systems are fully active. Payment milestones should be tied to this validated performance, not just installation.

Logistics of Compliance and Ongoing Maintenance

Importing cobots involves ensuring the equipment and its software meet U.S. standards. Work with your supplier to secure all necessary NRTL certifications (like UL for the U.S. market). Furthermore, treat safety zone maps as critical living documents. Any significant change in the workstation layout, process, or even the tasks performed by the human operator necessitates a re-assessment and potential reconfiguration. This is not a set-and-forget system. Factor in the cost and availability of the integrator's support for future re-validation when selecting your partner.

Mitigating Risk and Protecting ROI

The financial risk is twofold: lost productivity from a slow cobot and potential liability from an improperly safe system. Mitigate this by partnering with suppliers who view safety and efficiency as complementary goals. Insist on thorough operator and maintenance technician training from the integrator, so your team understands how the zones work and can identify when a re-evaluation is needed. The right supplier will provide clear documentation and tools for basic monitoring, empowering your maintenance staff to be the first line of defense against efficiency drift.

In conclusion, a slow cobot is often a symptom of a procurement process that ended at the loading dock. By specifying performance validation, choosing integrators with a focus on optimized safety, and planning for lifecycle re-assessment, you ensure your collaborative automation investment delivers both safe and productive collaboration.