Seakeeper 26 Manuale utente

Rev 7 MAR 2021

OPERATION MANUAL

*THIS MANUAL ALSO COVERS THE SEAKEEPER 20HD MODEL*

OPERATION

MANUAL

Product:

Document #:

Rev:

SEAKEEPER 26 / 20HD

90266

SEAKEEPER 26 / 20HD

OPERATION MANUAL

MARCH 2021

Contents:

Section 1 –System Overview

Section 2 –System Operation

Section 3 –Power Failures, Alarms, and Troubleshooting

Section 4 –Maintenance

Section 5 –Warranty, Limit of Liability, Property Rights

Section 6 –Specs and Summary

45310 ABELL HOUSE LANE, SUITE 350

CALIFORNIA, MD 20619, U.S.A.

PHONE: 410-326-1590

FAX: 410-326-1199

E-MAIL: customerservice@seakeeper.com

OPERATION

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Section 1: SYSTEM OVERVIEW

1.0 System Overview

The Seakeeper 26 uses gyroscopic principles to reduce boat roll motions in waves and wakes

independent of boat speed. In multiple Seakeeper installations, the Seakeepers operate

independently of each other and therefore this manual only discusses operation of a single unit.

A Seakeeper 26 consists of a gyroscope assembly, a CAN communications cable, and a Display.

Figure 1 illustrates the interconnection of these components and their interface with the boat.

FIGURE 1 –SEAKEEPER 26 STABILIZATION SYSTEM COMPONENTS

Technical specifications provided in Section 6 list the power consumption, total weight, and

dimensions of the major components. Gyroscopic principals that apply to boat roll control are

discussed on Seakeeper’s web site at www.seakeeper.com. The Seakeeper web site also

contains videos of Seakeeper operation and videos of several different boats operating in waves

with the Seakeeper on and off. It is recommended that the reader play these videos prior to

reading the remainder of this manual.

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Section 1: SYSTEM OVERVIEW

The gimbal angle and the rate of rotation about the gimbal axis (termed precession rate) play an

important role in its operation. These parameters are illustrated in Figure 2. At zero degree

gimbal angle, the sphere is vertical; it can precess a maximum of +/- 60 degrees about this

position. The amount of torque that the Seakeeper exerts on a boat’s hull to counter the wave

induced roll is directly proportional to the precession rate. The further the Seakeeper is from

vertical (zero degrees) the lower the anti-roll torque. The vertical arrows in Figure 2 illustrate the

direction of the forces that the Seakeeper exerts on the boat’s hull to damp roll motion.

FIGURE 2 –SEAKEEPER PRECESSION

Seakeeper precession is actively controlled by an electronic controller and a hydraulic brake

throughout each roll cycle so the Seakeeper supplies the maximum anti-roll torque and does not

make mechanical contact with hard stops that limit the maximum gimbal angle travel to +/- 60o.

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Section 1: SYSTEM OVERVIEW

There is a large torque about the gimbal axis when the Seakeeper is

precessing. Seakeeper cover panels are provided to prevent personnel or

equipment from contacting the Seakeeper while it is in operation. These

covers should not be stood on or have anything placed on top. The covers

should always be in place during operation. If it is ever necessary to touch

the Seakeeper while the flywheel is spinning, the Seakeeper must be

locked at the display to stop the Seakeeper from precessing. Seakeeper

maintenance should not be attempted unless the Seakeeper is locked and

the flywheel has stopped spinning.

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Section 1: SYSTEM OVERVIEW

1.1 Seakeeper Assembly

The Seakeeper assembly consists of a flywheel housed in a cast aluminum vacuum-tight

enclosure. The flywheel spins about a vertical axis and is supported by upper and lower pairs of

bearings. A Permanent Magnet AC motor mounted inside the enclosure spins the flywheel at

high speed.

The enclosure is fastened to two gimbal shafts that are supported by gimbal bearings on either

side. These shafts establish an athwart ship gimbal axis about which the flywheel and enclosure

precess or rotate up to +/- 60 degrees during operation. The gimbal bearings are supported by a

foundation which is attached to the hull structure. This foundation transfers the loads that the

Seakeeper produces to the hull structure.

An active hydraulic brake mechanism is located on the Seakeeper assembly to regulate the

Seakeeper’s precession motions about the gimbal shaft. It includes four hydraulic cylinders and

a hydraulic manifold.

A coolant pump, heat exchanger with reservoir, and thermostat are located near the manifold. A

glycol/water mix is circulated through a closed loop to the motor drive box, hydraulic manifold,

and the water jackets of the flywheel enclosure to remove heat.

FIGURE 3 –SEAKEEPER ASSEMBLY

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Section 1: SYSTEM OVERVIEW

1.2 Display

The display shown below is the user interface to the Seakeeper 26 and should be mounted at

the primary helm station, unless the vessel has compatible Multi-Function Display, in which

case the Seakeeper Display can be mounted elsewhere. It is used to start, operate, monitor and

shutdown the Seakeeper. Sensors, alarms, and shutdowns are provided to allow unattended

operation.

The display provides information in the event of an alarm. Alarms cause precession to stop

(Stabilize Off) and the Seakeeper to start coasting down (Power Off).

FIGURE 4 –OPERATOR DISPLAY

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Section 1: SYSTEM OVERVIEW

1.3 Drive Box

The glycol/water mix that cools the Seakeeper is also circulated through a cold plate inside the

Drive Box to remove heat from high-power electronic components.

The Motor Drive Box contains hazardous voltage. The cover

should not be removed while the flywheel is spinning and the

AC input voltage is present. This high voltage exists even if the

flywheel is coasting down and the supply voltage has been

shut off. The flywheel must be at Zero (0000) RPM and AC input

power disconnected for at least 10 minutes prior to any service

work on the motor drive box.

FIGURE 5 –DRIVE BOX

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Section 1: SYSTEM OVERVIEW

1.4 Electronic Control Module

The Electronic Control Module (ECM) monitors all the system sensors and automatically regulates

operation of the Seakeeper.

The controller commands the motor speed and regulates the Seakeeper’s precession rate and

gimbal angle. This is accomplished by commands to a high response flow control valve in the

hydraulic brake circuit that increases or decreases the brake pressure.

1.5 Inertia Measurement Unit (IMU)

The motion sensor suite in the IMU measures the angular movements of the vessel and the

vertical and lateral boat movement. These signals are communicated to the ECM through the

Seakeeper’s wire harness.

1.6 Brake

The brake mechanism consists of four hydraulic cylinders that attach to crank arms on the gimbal

shafts. The Seakeeper controller modulates how fast the oil can flow through the control valve

thus controlling the precession rate of the Seakeeper.

The brake hydraulic circuit is a pre-charged closed loop system –that is, there is no pump, motor,

or reservoir in the circuit. Accumulators are installed in the circuit so the pre-charge pressure

does not increase as the fluid temperature rises due to the braking action. Locking solenoids are

installed in the circuit to lock the Seakeeper so it cannot precess if there is a leak in the circuit or

a mechanical problem with the Seakeeper.

Seakeeper Hydraulic Hand Pump Kit, P/N 10384, is required for servicing the brake system.

Pressure should never be relieved unless this tool is available.

FIGURE 6 –BRAKE SYSTEM COMPONENTS

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Section 1: SYSTEM OVERVIEW

1.7 Cooling

The cooling circuit is a closed loop that supplies a glycol/water (50% distilled water and 50%

glycol) mix to:

•The motor drive box to remove heat from the drive electronics

•The brake manifold to remove heat from the brake hydraulic circuit

•The flywheel enclosure water jackets to remove heat from the flywheel bearings

The heated fluid then passes through a thermostat before bypassing or flowing through a heat

exchanger that has sea water on the cold side. The circuit also contains a coolant reservoir for

coolant expansion and to make filling easy. The reservoir contains a 7 psi (0.5 bar) pressure cap.

The heat exchanger contains zinc anodes that must be inspected and changed regularly to ensure

maximum heat exchanger life.

FIGURE 7 –COOLING SYSTEM COMPONENTS

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