OPERATION
MANUAL
Product: Document #: Rev: Page:
SEAKEEPER 3 90379 1 7 of 8
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
angular position. This is accomplished by commands to a high response flow control valve in the
hydraulic brake circuit that increases or decreases the precession rate.
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 wiring harness.
1.6 Brake
The brake mechanism consists of two hydraulic cylinders that attach to a crank arm on the
Seakeeper gimbal shaft. The Seakeeper controller modulates how fast the oil can flow through
a control valve thus controlling the precession rate of the Seakeeper.
The brake hydraulic circuit is a pre-charged closed loop – that is, there is no pump, motor or
reservoir in the circuit. An accumulator is 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.
FIGURE 6 – BRAKE SYSTEM COMPONENTS
Hydraulic Hand Pump Kit, P/N 10384, is required for servicing the brake system. Pressure
should never be relieved unless this tool is available.
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