KBi KSM, Installation & Operation Manual

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Appendix
C
: Supplement for Boats using Keypad Button or Digital Switch for Engine
Starting (including Boats with Multiple Engines)
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.
When installing KSM on a boat that incorporates keypad buttons, there are no mechanical
switches or buttons to push for engine starting. Using the KBI DPST method of installation,
KSM activation is not an option.
If the OEM engine manufacturer or the boat builder reviews the KBI KSM Theory of
Operation (Pages 13 + 18) and the requirements for DPST-type functionality, then
incorporating the DPST-type function and engineering it into the factory build should be no
problem. However, when installing a KSM on a boat that has already been built with keypad
button or digital switch starting, the following procedure and hardware (wiring) should be
used. See Figures C1, C2, and C3.
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 system.
Figure C1: Typical Cable Installation .................................................................................................................................. 32
Figure C2: Alternate Method .................................................................................................................................................. 33
Figure C3: Power Sources for KSM Pin 4 and Emergency Start Switch ................................................................ 34
Figure C4: Multiple Engine MKSM Schematic ................................................................................................................. 35