Date: 5/21/2026
Previous Blog: OLI Digital Ecosystem: Easier Access to More Data
Modern manufacturing depends on safe, repeatable lifting. When crane operations vary from operator to operator or shift to shift, the result is often slower cycle times, greater load swing, more rework and higher risk.
Operator assist features are designed to help standardize lift behavior and reduce the variables that slow down production. They help improve throughput while enhancing safety and protecting equipment.
With the launch of the Spacemaster® SXR, R&M unveiled operator assist features that enhance efficiency, safety and performance across a wide range of applications and environments.
What Operator Assist Features Are and Why They Matter
Operator assist features are control functions that help guide crane and hoist motions more consistently. Instead of relying only on manual skill to manage load swing, centering or side pulling, these features make crane operation more intuitive and add automated corrections to improve control.
These features can help facilities:
- Reduce load swing and settling time
- Improve positioning accuracy of the hook at the load
- Support more consistent cycle times
- Reduce the chance of side pulls, which lead to equipment damage
- Improve operator confidence and efficiency
Operator assist does not replace the operator - it enhances performance where speed and repeatability matter most.
The Role of OLI Comms+ and Why Crane Type Matters
OLI Comms is the standard hardware package for the Spacemaster SXR hoist when used in a bridge crane. The OLI Comms+ hardware adds functionality, including full crane fieldbus connectivity that enables advanced operator assist features. Fieldbus communication protocol simplifies the wiring and technology needed to make these features work. This also makes the crane more affordable and easier to service.
What OLI Comms+ Does
OLI Comms+ provides the communication foundation that allows control devices to function as a network, not just individual components. With OLI Comms+ devices can send data and receive feedback from other controls in the network to detect conditions like sway or side pull and correct or prevent common operator mistakes. OLI Comms+ enables:
- Data sharing between the hoist, trolley and bridge
- Access to the full suite of operator assist features
- Real-time responses to operator inputs and load conditions
Many operator assist features rely on coordinated motion control. If the crane cannot communicate across these systems, features such as Anti-Sway Control, Hook Centering and Follow-Me are not possible.
Operator Assist Features and How They Work
Follow-Me: Guiding the Hook to Reduce Swing and Improve Control
Follow-Me helps guide the hoist intuitively through the work areas by allowing the operator to maneuver the load by guiding the hook rather than using a separate controller.
How Follow-Me Works
The Follow-Me feature lets the operator move the trolley and bridge by pulling or pushing the hook block in the desired direction while also pushing the down button on the controller. Pushing or pulling the load block creates a rope angle that is monitored by an inclinometer. As the rope angle increases, the traveling speed increases accordingly. This control feature allows the operator to position the crane quickly and accurately, which can lead to faster load cycle times and easier operation.
Follow-Me Applications
- Repetitive pick-and-place workflows
- Lifts that require a high level of precision
- Work cells with a high volume of varied types of picks
Goals It Supports
- Faster positioning
- Greater operator precision
- More intuitive controls for operators of all experience levels
Hook Centering: Eliminates Side-Pull and Reduces Equipment Wear and Tear
Hook Centering moves the crane so that the hook becomes centered over the load. This eliminates side-pull situations and reduces load swing caused by off-center lifts.
How Hook Centering Works
Once the hook is connected to the load, the operator begins lifting at slow speed. The positions of the trolley and bridge are automatically corrected to align the hook over the load. Once the hook is centered and the ropes are tensioned, the load can be lifted safely. Operators receive haptic feedback via vibration in the radio controller when the load reaches the proper centering position.
Hook Centering Applications
- High-volume pick-and-place operations
- Assembly and fabrication processes with repeat lifts
- Work areas where precise, controlled load pickup is critical
Goals It Supports
- Increases repeatability in routine lifting tasks
- Speeds up positioning and staging between lifts
- Reduces wear on ropes, drums, and rope guides
Tandem Hoist Synchronization: Improving Stability, Safety and Speed in Multi-Hoist Applications
This feature electronically synchronizes lifting in a multi-hoist configuration to ensure active hoists work together. This helps the load remain stable, level and predictable while reducing the possibility of overloading one hoist in the system due to an unbalanced load.
How Tandem Hoist Synchronization Works
The hoists maintain synchronized hook positions based on encoder feedback. Synchronization is maintained even when the load on each hook differs. This functionality requires inverter-controlled hoist drives.
Tandem Hoist Synchronization Applications
- Loads with dual pick movements
- Components sensitive to tilt
- Frequent tandem lifting operations
Goals It Supports
- Improved load stability
- Better balancing of loads
- Faster, repeatable lift cycles
Side Pull Prevention: Protecting the Hoist and Load Path
Rope angle monitoring automatically stops lifting if the rope angle exceeds 4° from vertical, to prevent damage to critical lifting components.
How Side Pull Prevention Works
The inclinometer monitors conditions that indicate off-vertical loading and prevents lifting to avoid damaging equipment such as the rope, rope guide, and rope drum.
Side Pull Prevention Applications
- Offset load picks
- Load turning applications
- Die turning or flipping
Goals It Supports
- Reduced risk of improper loading
- Protection of mechanical components
- Improved safety
Slack Rope Protection: Reducing Rope Damage and Shock Loading Conditions
Recognizes when rope tension drops below a set threshold or when a slack condition is likely. Rope tension is continuously monitored and if slack is detected, the hoist motor is automatically prevented from lowering.
How Slack Rope Protection Works
Slack rope protection prevents further lowering of the bottom block when a slack rope condition is detected within preset limits. This feature is used with a below-the-hook device, and the system requires HoistMonitor® Enclave.
Slack Rope Protection Applications
- High-cycle lifting
- Applications utilizing spreaders, shackles and slings
- Lifts requiring customized below-the-hook devices
Goals It Supports
- Reduced risk of shock loading
- Reduced rope wear
- Lower maintenance needs
Load Restricted Area: Reducing Risk and Protecting the Facility
The Load Restricted Area feature defines a zone where the crane is allowed to travel, but load handling is limited or prevented. This is useful when a facility needs to move the crane through an area, but does not want operators lifting a load at the full rated capacity.
How Load Restricted Area Works
Defined areas of the factory floor are set so that the crane can only be operated below its rated capacity. When the crane enters the load restricted area, the controls can limit certain functions depending on its configuration.
Load Restricted Area Applications
- Active equipment zones and pedestrian traffic corridors
- Maintenance and inspection areas
- Retrofitted areas of the runway that have a lower rated capacity
Goals It Supports
- Improved safety compliance
- Fewer near-miss incidents
- More controlled crane operation
Restricted Zones: Improved Safety and Less Downtime
The Restricted Zones feature allows you to define areas where crane travel or hoist motion is blocked or limited to prevent the crane from entering unsafe or incompatible locations.
How Restricted Zones Work
Restricted zones are set as boundaries along the bridge and trolley travel paths. When the crane approaches a restricted boundary, motion into the zone is prevented or limited to avoid potential hazards.
Restricted Zones Applications
- Avoiding large pieces of machinery on the work floor
- Robotic or high-use work cells
- High-traffic zones
Goals It Supports
- Built-in safety limits
- Reduced risk of equipment and facility damage
- Reduced contact-related downtime
Anti-Sway Control: Continuously Counteracting Swing
Anti-Sway Control reduces load sway caused by traveling movements by applying counter-movements of the trolley or bridge. This can be valuable when travel distances are long, the load is more dynamic or cycle time pressure is high. Anti-Sway Control can be active or passive.
How Active Sway Control Works
The sway correction is based on real-time rope-angle measurements taken by an inclinometer installed on the hoist. At the start of each travel movement, a short jog window allows brief positioning movements without counter-movements. The jog-window duration and speed are adjustable. Active sway control detects and adjusts for load swing conditions as they happen in real time.
How Passive Sway Control Works
This feature operates based on a mathematical model that represents the hook’s position as a pendulum. At the start of each travel movement, a short jog window allows brief positioning movements without counter-movements. The jog-window duration and speed are adjustable.
Anti-Sway Control Applications
- Long travel runs
- High throughput production areas
- Facilities with a mix of experience levels among operators
Goals It Supports
- Reduced swing even during faster movement
- Improved safety in busy work zones
- Better control without adding complexity for the operator
Snag Prevention: Reducing Sudden Stops and Unsafe Load Reactions
A hook, sling, load or below-the-hook device can accidentally get caught on or entangled with an object while the trolley or bridge is traveling, creating a dangerous situation. Even a brief snag can cause a sudden change in load forces, leading to damage, an uncontolled load or a safety incident.
How Snag Prevention Works
Snag-prevention monitors the rope angle using an inclinometer while the crane is in motion. If the rope angle increases due to a snag, the crane will automatically slow down and then stop once the rope angle reaches a predefined limit.
Snag Prevention Applications
- Irregular or protruding loads
- Tight work cells
- Frequent rigging changes
Goals It Supports
- Reduced equipment and load damage
- Improved safety in congested areas
- More consistent handling across operators
Shock Load Prevention: Protecting the Lift When Conditions Change Suddenly
The shock load prevention feature ensures smooth load pick-up and reduces impact loading caused by improper hoisting practices. Impact loading is a leading cause of mechanical and structural fatigue, which can shorten the lifespan of the hoist and crane structure.
How Shock Load Prevention works
The HoistMonitor Enclave monitors the load, and if a sudden load change is detected (such as slack chains or slings becoming tight), the hoist movement slows down until the load is picked up from the ground. Once the load is off the ground, normal hoisting speed resumes. Shock Load prevention works optimally when the lifted load exceeds 30% of the rated hoist capacity.
Shock Load Prevention Applications
- Operations that use slings, lifting chains or shackles
- High-speed lifting operations
- Specialized below-the-hook devices such as shakers, magnets or spreader beams
Goals It Supports
- Reduced impact forces
- Improved control during sudden load scenarios
- Lower stress on equipment
How to Choose the Right Operator Assist Features for Your Application
When choosing an operator assist package, consider the following:
- Level of precision needed for positioning
- How sensitive the process is to load swing and settling time
- Operator experience and shift variation
- Safety requirements and plant standards
- High-cycle picks, high-throughput production lines or frequent jogging and positioning needs
- Load turning and flipping requirements or applications with high risk of side pulling
Not sure what you need? With OLI Comms+ you can activate operator assist features after commissioning based on real usage data.
Next Step: Share Your Application Goals
If you are evaluating a wire rope hoist for a production environment, start by defining the outcomes you want: shorter cycle time, better positioning, improved safety or reduced maintenance risk. From there, contact us to discuss selecting the appropriate operator assist features and crane type to match your workflow.