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Section 1.0 — Name goes HereSection 4.0 — Appendix / Reference
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4.4 Gear / Throttle Backup System (optional)
A. Description
The EEC Gear / Throttle Backup System allows the control of the transmission solenoid valves, as well as engine throttle
through separate potentiometers other than the EEC Control System in the event of a failure. These separate potentiome-
ters are mounted in one of the EEC Control Heads installed in the vessel. The switchover from the normal operation to
backup operation is actuated by an Enable Switch mounted in the console. This Enable Switch turns on the Transfer Box
which transfers control of the gear / throttle from the EEC Control System to the backup system. Presently this backup sys-
tem is only for the gear / throttle and not for the trolling valves. In failure conditions the trolling valve will default to full lock-
up when power is removed.
B. Operation
Under normal operations, the gear and throttle are controlled by our EEC Control Processor (CP). This signal runs through
the normally closed contacts of a relay in the Backup Transfer Box.
Once there is a failure of the control system, (noted by all four mode LED's blinking and a tone is heard from the Control
Head) the vessel captain would switch the backup system switch on. (Note, we recommend that this on/off enable switch
be protected so it cannot be accidentally energized.) This would energize all the relays in the Transfer Box and the gear
/ throttle would then be controlled by the backup potentiomenters that are mounted in one of the boat Control Heads. One
other feature that is still operational in the backup mode is the start interlock function. This function will not allow the cap-
tain to start the engines when the transmissions are in forward or reverse gear. They must be in neutral in order to start the
engines.
Backup System Items
There are three main components of the Backup System.
EEC Control Head with Backup potentiometers - Externally this looks like a normal control head
but internally it has extra potentiometers mounted. These potentiometers control the port and star-
board gear / throttle when the backup system is activated. Underneath this control head also has two
wire exit holes on the bottom cover instead of one. One exit hole is for the normal station cable that
runs to the CP and the other hole is for the cable that runs to the Backup System Transfer Box. Once
the bottom cover is removed there is an instruction label inside that explains the connections and
shows the model and part #.
EEC-GT Backup System Transfer Box - The Transfer Box is mounted near (within 10 feet) of the
EEC Control processor. This transfer box is comprised of relays which control the gear / throttle when
the system is in backup mode. Externally this box has watertight connectors that the harnesses plug
into. The power for this Transfer Box is normally run from the same source that the Control Processor
is connected to. The backup system can be powered by 10 - 40volts DC.
Backup System Harnesses - These are pre-terminated harnesses which redirect the start interlock,
power switch, gear and throttle signals to run through the transfer box before running to the various
connections on the boat.
C. Installation
1) Mount the Transfer Box within 10 feet of the EEC Control Processor which is normally
mounted in the engine room. (Note: the harnesses which run from the CP to the Transfer Box come
in 5' standard or 10' optional lengths.)
