KBi KSM, Installation & Operation Manual

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Appendix A: Supplement for Boats using a Key-Switch for Single Engine Starting
NOTE:
The PLC inside the KSM needs power (approximately 2.5 amps) from a source, such
as a key switch, that provides power only when the boat is in operation. Consider
this additional 2.5 amps of power and how it may affect the reliability of the source.
This new circuit should be protected with a 5-amp fuse or circuit breaker per ABYC
standards, and it should in no way affect the integrity of the engine’s starting or
running operation.
NOTE: The following appendix is an alternate method for installations on vessels with key-
switch starting.
When installing KSM on a boat that incorporates key switch starting, no rocker switch or push
button is required.
NOTE:
If the OEM engine manufacturer or the boat builder reviews the KBI KSM Theory of
Operation (page 13 + 18) and the requirements for DPST-type functionality, then
incorporating the DPST-type function and engineering it into the factory build key-
switch should be no problem. However, when installing a KSM on a boat that has
already been built with key-switch starting, the following procedure and hardware
(wiring) should be used.
NOTE: If battery power was insufficient ( ˂ 7 volts), too weak to enable an engine start or
provide adequate power to “S” terminal, an emergency momentary ON push button
switch on the vessel (installed near the controls) would supply capacitor power to
enable the entire KSM system.
Figure A1: Typical Cable Installation .................................................................................................................................. 23
Figure A2: Typical Boat Key-Switch Schematic .............................................................................................................. 24
Figure A3: Schematic, Alternate Source for Start Signal ............................................................................................. 25