OPERATION
MANUAL
Section 1: SYSTEM OVERVIEW
1.5 Inertia Measurement Unit (IMU)
The motion sensor suite in the IMU contains rate sensors that measure the angular movements of the
vessel and accelerometers that measure the vertical and lateral boat movement. These signals are
communicated to the ECM on a CANbus connection inside the gyro’s wiring harness.
1.6 Brake
The brake mechanism consists of two hydraulic cylinders that attach to a crank arm on the gyro gimbal
shaft. The hydraulic cylinders are plumbed to a manifold / valve assembly so when the gyro rotates
about the gimbal axis, oil from one side of each cylinder is pushed through the high response flow
control valve into the same side of the other cylinder. The gyro controller modulates how fast the oil
can flow through the control valve thus controlling the precession rate of the gyro.
The brake hydraulic circuit is a pre-charged closed loop – that is, there is no pump, motor or reservoir in
the circuit. Accumulators are installed in the circuit so the precharge pressure does not increase as the
fluid temperature rises due to the braking action. Locking solenoids are installed in the circuit to lock
the gyro so it cannot precess if there is a leak in the circuit or a mechanical problem with the gyro.
FIGURE 6 – BRAKE SYSTEM COMPONENTS
Gyro 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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