Collaborative Robot Throughput Slowing Down? How Oversized Safety Zones Impact Your ROI

You invested in a collaborative robot (cobot) to boost productivity, but post-deployment metrics show a surprising result: your cycle time has actually increased. This frustrating scenario is often not a failure of the robot itself, but a critical misstep in its integration—specifically, an oversized or poorly configured safety-rated monitored stop (SRMS) zone or reduced speed zone. For procurement specialists and operations managers sourcing automation globally, understanding this technical pitfall is key to protecting your investment and achieving the promised ROI.

The core of the issue lies in the balance between safety compliance and operational efficiency. Cobots are designed to work alongside humans without traditional cages, relying on sensors to define zones where they must slow down or stop. Overly conservative safety engineering, often driven by a misinterpretation of standards like ISO/TS 15066 or a supplier's risk-averse default settings, can create zones that are far larger than necessary. The result? The cobot spends a disproportionate amount of its cycle creeping at a reduced speed, negating the speed advantages of automation. During supplier selection and factory acceptance testing (FAT), you must scrutinize the safety zone layout as rigorously as the robot's payload and reach.

A proactive procurement and deployment checklist is essential. First, mandate a detailed risk assessment conducted jointly by your integrator and your own safety engineers—do not accept generic templates. This assessment should map all human-robot interaction points to define the minimum necessary zones. Second, during equipment sourcing, require potential suppliers to provide simulation data or case studies showing their zone optimization approach. Third, in the procurement contract, specify performance metrics for cycle time with the final safety configuration active, not just in a theoretical "high-speed" mode. Finally, plan for post-installation tuning: the initial zones should be considered a starting point, with a scheduled review after several weeks of operation to safely tighten parameters based on real-world operator patterns.

The risks of getting this wrong extend beyond low throughput. Inefficient cycle times can create bottlenecks, forcing costly line rebalancing or even the purchase of additional units—a direct hit to your project's financial justification. From a logistics and maintenance perspective, ensure your team or local service partner receives thorough training on how to adjust these zones (within compliant limits) for future process changes. When sourcing, prioritize suppliers who offer clear documentation, accessible software tools for zone management, and responsive technical support for this specific issue. Your goal is not just to buy a cobot, but to procure a fully optimized, efficient, and compliant workcell. By focusing on the often-overlooked detail of safety zone configuration, you transform your cobot from a slow-moving novelty into a genuine driver of productivity and competitive advantage.