CANSEA Wiring System

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CAN-SEA Wiring System

• Marine Wiring Systems
• 27832711094

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What is CAN?
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Traditional wiring

• Uses switches or breakers on a panel
• Has two wires, red and black, from the switch to
  the device
• Voltage drops are high and critical
• Breakers are rated in large steps, 10,20 30 amps
• 60Kgs of wire for a 44 foot Cat is normal.

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Many wires in the loom
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The switching problem

• The Nav light switch often has 3 pairs of wires
• Two to the aft nav light
• Two to each of the port and starboard lights
• Cable lengths are many meters

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The common Negative bus

• The first solution, to reduce wiring, run a
  single negative through the boat
• In a cat this is an H pattern
• Connect the starter battery negative directly
• Connect the house batteries negative via a shunt

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The reason why not

• The negative bus has many branches to devices.
• It is easier to lay wires than put 20 or 30 bus
  connectors in place
• Calculating wire sizes is more difficult

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Advantages

• Much less wire in the boat
• Easier to find a problem.
• Reduces the wire cost/weight/installation time

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The common Positive bus

• To reduce the positive wiring-
• Put all the on/off switches near the devices they
  operate
• Single positive through the boat
• Connect the house batteries via a single large
  overload, fuse, and on-off switch

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Not Practical?

• No central point of control!!!!!
• But if the switches can be operated remotely,
  this is very practical.
• Minimum wiring looms
• Simple to find faults.

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The CAN-SEA layout
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The CAN-SEA wiring system

• The switches are placed near the device, on the
  main power bus, and operated via a Can-Bus
  signal.
• Standard technology as applied in the automotive
  industry
• NMEA standard can-bus twisted pair line.
• The switches can be intelligent!
• Switching on the NAV lights does not require 3
  sets of wires, simply three signals!

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Intelligence!

• Each switch can be told to send out alarms.
• Precise over-current setting and alarm
• No current alarm- blown bulbs
• Runtime exceeds X minutes- stuck level switch

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Add a remote contact

• Each switch has a pair of supplementary contacts
• The switch can be set to use these, a local
  button, toggle switch, or level-pressure-flow
  switch can be connected.
• The switch when on will operate according to the
  supplementary contact state.
• Can be used to locally switch on/off lights and
  dim them.

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Enhance the supplementary contacts

• Set a delay between the contact closing and the
  switch going on (wave action on a level switch)
• Set a delay on the contact opening and the switch
  opening (dry out the tank)
• Set the runtime maximum, and switch off or leave
  running with an alarm.

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How to operate the switches

• Either a dedicated computer and panel with
  membrane buttons- supplied by MWS
• Or use your laptop or an installed PC, or both
  with the MWS software.
• Most boats these days have at least one computer
  and run Nav software, this can be used with a USB
  CAN interface supplied by MWS

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Run more than one computer

• If two computers are used, the first one starts
  as the master, the other provides the same
  functionality.
• Switch things on/off from two or more places in
  the boat.
• The computer allows automatic switching on/off of
  things at given times.

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Include level displays

• Tank levels can be sensed and transmitted on the
  can bus for the computer to display, so can other
  data.
• Engine RPM, Oil pressure,Temperatures

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The computer

• Any standard PC running windows XP or Vista, or a
  Mac running Windows.
• Can be a touch screen
• The price/type/size choice is yours. From a
  standard machine to a Washable NEMA4 sunlight
  viewable panel mounted unit.
• From 10.4 to 15 or larger.

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The software

• Displays several tabbed pages
• Each page has a boat outline and icons or buttons
• An example might be Lighting
• Touch an icon to switch on, touch again to switch
  off.
• The icon changes color to show on/off
• Current used, runtime and other information
  available.

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An Example screen
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Analyse current usage

• Your battery monitor shows the state of the
  battery, and instantaneous current flows.
• The Can-Sea software shows how much current was
  drawn by each item over what period, and the
  total consumption.

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The Alarms

• Each alarm situation, over current, blown lights,
  excessive run-time, is displayed and a buzzer
  beeps.
• Finding the fault is easy, it is simple to check
  if there is power at the switch.
• If the switch is not communicating the software
  tells you so.
• From the switch to the device is a short cable
  run.

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Voltage drops

• Using a a single heavy bus minimizes voltage
  drops.
• The same cable is shared, and as all electrical
  items are rarely on at any one time it saves on
  copper.

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Installation

• Install the switches and connect the devices
• Connect the switches to the power- daisy chain or
  branch
• Connect the signal cable in a daisy chain to the
  switches and the computer.

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Adding a device

• CAN-SEA switches are supplied in cast
  polyurethane blocks, with tinned brass bolted
  connections. No Corroding plugs. Supplied with or
  without holders.
• If a spare connection exists, simply connect the
  device and set the program.
• Otherwise, add a switch near the device, connect
  it to the nearest power bus points and the signal
  cable, and set the program.
• No pulling of wires- No extra switches

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What if things go wrong?

• Have a spare computer or laptop available.
• If a Can-Sea switch fails, replace it.
• If you cannot replace it, use a jumper to connect
  the power to the device outlet.
• If there is no computer- use the override Keypad.

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And my AC?

• The Can Sea switches can be supplied in 12 or 24
  volt, and can be supplied with optically isolated
  AC relays which will switch your AC supply.
• We suggest centralizing all AC switching in one
  or two boxes, and switching the AC devices from
  the same computer or panel.
• A special can sea SSR actuator is supplied.

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Good Wiring

• The CAN-SEA switches or breakers, commonly called
  nodes, are solid cast units.
• They are water proof.
• They conform to the EMC specifications of the CE.
• The CAN sea signal bus is a twisted pair signal
  cable.
• Wiring MUST however be done to the correct
  standards with lugs, heatshrink, and liquid vinyl
  insulation on the lugs.

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Wiring calculations

• The Web Site www.yachtwiring.com has cable
  calculations and other information
• Please refer to the bilge pump regulations and
  how these should be done.