OPERATION
MANUAL
Product:
Document #:
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SEAKEEPER 26 / 20HD
90266
7
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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
