Offshore winch motion control
Select the compensation control and drive around the actual lifting operation. State where motion is measured, which reference the suspended load must follow and which combinations of load, depth and vessel motion require acceptance evidence.
Winch-drive active heave compensation systems that use vessel-motion feedback to pay rope in and out during offshore suspended-load handling. The Offshore crane page covers the complete pedestal-mounted crane; Hoist winch covers the lifting winch as a machine. Inline hook-mounted compensators and passive cylinders are distinct architectures outside this winch-control scope.
01
Norwegian Dynamics describes an MRU measuring vessel heave, roll and pitch, with the controller using the surveyed lever arms to calculate crane-tip motion. In winch AHC, payout and haul-in oppose that motion; drum-position feedback closes the actuator loop. Define the sensor location and coordinate relationship in the integration drawing. [1]
Specify the required load reference, such as height relative to the seabed during suspended handling, and the operator’s commanded lowering or lifting motion. Record sensor orientation, timing and validity checks together with the winch feedback signals.
Scantrol identifies the MRU, compensation controller and actuating winch or cylinder as the system elements, and offers a controller with an integrated MRU. Confirm whether the proposed installation uses an integrated sensor or an external MRU and document the actual signal path. [3]
02
Bosch Rexroth describes an arrangement in which a conventional hydrostatic drive performs lifting while superposed secondary-controlled drives perform active heave compensation. Its Kenz reference lists a load capacity of 160 t and working depth up to 2,100 m. Those are a named installation reference, not a rating for every retrofit or control package. [2]
Scantrol describes connecting its controller to an existing winch control system and checking required power, speed and torque for the application. Include the existing drive, control interface and feedback arrangement in the retrofit review. [3]
Define how manual hoisting, compensation enable/disable, drive limits, brakes and loss of valid motion data interact. Request a documented transition procedure and test the specified responses before accepting the installed function.
03
Norwegian Dynamics identifies control delay, actuator speed, available stroke/force/power and the elastic wire/load response as limits on active compensation. At depth, load motion can differ from the hook motion being controlled. State the measured output and location when specifying residual-motion performance. [1]
Provide the payload, rigging, deployed wire length, water depth, vessel-motion input and required residual load motion. Ask for the supported operating envelope, the drive limits reached within it and the evidence behind the proposed setting.
Agree on a test matrix and record both the input motion and the resulting response. Keep simulation results, dockside commissioning evidence and offshore measurements identified by their actual test conditions. Avoid assigning a single percentage to every load and sea state.
04
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Lift: [payload; rigging; depth; wire length; reference target] Motion: [vessel/crane-tip input; sensor location; coordinate survey] Drive: [winch; motor/hydraulics; feedback; speed/torque/power limits] Control: [MRU interface; timing; manual hoist; enable/disable] Failure response: [invalid motion data; limits; brake and transition procedure] Acceptance: [test matrix; residual-motion measurement; recorded conditions]
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This scope is the winch-drive compensation function: motion sensing, control integration and opposing winch movement. The complete offshore crane is specified separately. [3] [2]
Scantrol describes a controller with an integrated MRU. Confirm the proposed sensing arrangement and its location rather than assuming a separate sensor package. [3]
Norwegian Dynamics notes that wire stretch and the submerged load response can make payload motion differ from the controlled hook motion. Define the measurement location, load and operating conditions. [1]
Sources checked 2026-10-16. Norwegian Dynamics explains the feedback path and compensation limits. Rexroth supplies a hydraulic-drive arrangement and named reference; Scantrol describes controller and retrofit integration.
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