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© 2014 SeaStar Solutions
Optimus Installation Manual, Rev. E
2-1
2.0 systEm ovErvIEw
Optimus EPS is a steer-by-wire system that replaces a traditional
hydraulic helm with electronic components that communicate over a
serial data network. This state-of-the-art system incorporates many
advanced features to make it safe and reliable. These features
include redundant sensors, fault-tolerant communications, extensive
self-monitoring, and fault communications to notify and advise the
operator in case of a system fault.
The Optimus EPS system consists of several major components,
listed below. Refer to figures 2-1 and 2-2 to see these components
in a schematic system diagram.
can networks
CAN (controller area network) is a serial network protocol that is
widely used in marine and automotive control systems. Each device
(node) on the network can send and receive data using specially
formatted messages. The ability to reliably communicate data between
devices is what enables the steer-by-wire functionality of Optimus EPS.
Optimus EPS uses up to three independent CAN networks, designated
CAN1, CAN2, and CAN3.
•
CAN1 is a low-speed, fault-tolerant network with two pairs of signal
wires in each cable. It is used for safety-critical communications.
•
CAN2 is a high-speed network that is well-suited for non-critical
tasks such as passing data to and from the CANtrak display.
•
CAN3 is a public network using the NMEA 2000 protocol. The
Optimus system broadcasts public messages onto this network,
and can also monitor the network for engine RPM. Use of this
network is optional.
More information about CAN may be found in Appendix B.
electronic helm
The helm converts steering wheel movement into digital messages
that are sent over CAN1 to the pump control module (PCM). A
system of friction plates in the helm allow the steering effort to be
adjusted according to a setpoint received from the PCM. (A steering
wheel is not included with the Optimus EPS system.)
cantrak display
The CANtrak display is a small color LCD that displays system status
and fault information to the operator. It is also used to make changes
to user-adjustable steering settings. Authorized installers have access
to additional menus with system setup and calibration tools.
pump control module (pcm)
The PCM receives wheel movement messages from the helm(s) and
operates the hydraulic steering pumps to steer the vessel as
required. The PCM uses position feedback from the SmartCylinders
for precise steering control and fault detection. The PCM can also
respond to inputs from a certified autopilot system.
2.1 System Description