What the system must achieve
Maintain reliable position awareness during container handling, slewing and hoisting while the machine is exposed to rain, spray, vibration and salt-laden air.
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Application guide
Encoders for Port and Marine Machinery
Select IP68 absolute encoders for port cranes, winches, reach stackers and marine machinery exposed to water, vibration and salt-laden air.
01 · THE MACHINE
Measure the movement at the machine—not after the motion is lost in the mechanism.
Typical feedback points include crane slewing, steering joints, boom mechanisms and winch drums. The chosen mounting point must represent the controlled movement without adding backlash or excessive shaft load.
In plain termsFirst identify the movement the controller needs to know. Only then choose the encoder.
02 · WHAT TO MEASURE
Read the drum where motion becomes measurable.
A shaft or geared take-off can provide a direct representation of retained drum travel. The final mounting must control backlash, shaft load, corrosion and cable movement.
- ✓Direct shaft relationship
- ✓Protected coupling
- ✓Sealed cable route
VIEW PRODUCT PAGE →03 · RECOMMENDED PRODUCT
RS485 Modbus RTU IP68 Waterproof Absolute Encoder
Use protected absolute feedback as the engineering starting point.
Start with stainless-steel IP68 construction and the controller's native interface. Then confirm salt exposure, connector sealing, coupling, vibration and the model-specific immersion condition.
✓ Slewing, boom and steering position✓ Winch and drum turn counting✓ IP68 stainless-steel construction✓ RS485, CANopen, SSI/BiSS-C and analog options
View product parameters →04 · HOW IT WORKS
From machine movement to a control decision.
The encoder turns crane, steering and drum movement into a position value the controller can act on.
WHAT THE SENSOR DOES
Mounted on the measured shaft, joint or geared mechanism, the absolute encoder follows physical movement and reports angle or retained turns. The controller uses that value for positioning, travel supervision and recovery after a power interruption.
- 01MOVEMENTMachine movement
- 02SENSINGAbsolute sensing
- 03SIGNALPosition signal
- 04CONTROLMotion controller
How we select the sensor
Select single-turn or mechanical multi-turn feedback from the real movement range, then match RS485, CANopen, SSI/BiSS-C or analog output to the controller. Finish the design with stainless construction, protected coupling, sealed cable entry and corrosion review.
05 · EXPECTED RESULT
What improves after the correct feedback is installed.
SELECTION TABLE
Port and marine measurement points
Use this table as an initial engineering checklist. Final model configuration must be confirmed against the controller, mechanical drawing and operating environment.
Measurement taskRecommended starting configuration
Crane slew or steering angleSingle-turn absolute encoder with a mechanically protected coupling
Winch or drum positionMechanical multi-turn absolute encoder sized for the full retained turn range
Reach stacker boom or spreader positionAbsolute rotary or draw-wire feedback according to the measured mechanism
Deck or waterside machineryIP68 stainless-steel housing with sealed cable or connector and corrosion review
ENGINEERING PROCESS
How to select the right configuration
- 01
Identify the shaft, joint or linear movement and its full travel.
- 02
Choose RS485, CANopen, SSI/BiSS-C or analog output to match the controller.
- 03
Confirm resolution, turn range, coupling, shaft load and cable exit.
- 04
Review salt spray, galvanic corrosion, vibration, drainage and connector sealing before approving the drawing.
RELEVANT PRODUCTS
Technical product pages
RS485 Modbus RTU IP68 Waterproof Absolute Encoder
Stainless-steel IP68 absolute feedback for washdown and outdoor machinery.
View parameters and drawings →CANopen IP68 Waterproof Absolute Encoder
Stainless-steel IP68 absolute feedback for washdown and outdoor machinery.
View parameters and drawings →
Mechanical Multi-turn IP54 Absolute Encoder
Battery-free IP54 geared turn counting retains absolute position through power loss.
View parameters and drawings →COMMON QUESTIONS
Frequently asked questions
Does IP68 mean an encoder is automatically suitable for seawater?
No. IP68 refers to dust and water ingress under a stated test condition. Salt spray, corrosion, cable glands, connectors and mounting materials require a separate review.
Which encoder is used for a winch drum?
A multi-turn absolute encoder is commonly considered when the controller must retain drum position after power loss. The required turns must include the full operating range and setup margin.
Can one model be used for both steering and hoisting?
Not automatically. Steering may need single-turn angular feedback while hoisting can require retained multi-turn measurement, different mechanics and different safety functions.
RELATED GUIDANCE
Continue your selection
EDITORIAL SCOPE
How this guidance is prepared
FOSAI consolidates available supplier technical material into a buyer-oriented selection guide. Parameters, certifications and compatibility are not generalized across every model; the final suffix, controlled drawing and project conditions must be confirmed before ordering.
MODEL SELECTION SUPPORT
Send the model.
We’ll check the complete fit.
Include the existing model, controller interface, supply, measurement range, shaft or mounting drawing, environment and quantity.
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