Class1 Vernier Throttle for CAT - Manual (Page 2)

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DOC 101058C_c:\manuals\throttles\cat\catthrot.p65
Throttle Interface Control Module
System Overview
The
Class1 Vernier Throttle Interface is designed to allow industry standard vernier style controls (such
as the Felsted Electronic Vernier II Control) and other potentiometer controls to be used with electroni-
cally controlled engines. This unit will work with electronically controlled Caterpillar Engines (C10,
C12, 3116, 3126, 3176, 3406, 3116B and 3126B) using a Pulse Width Modulated (PWM) Signal.
The interface converts a linear voltage input (potentiometer) into a PWM signal to control the engine.
True variable speed control is attained and the unit will maintain a selected engine RPM irrespective of
the engine load within it’s horsepower and torque capabilities. The interface can be used to govern
engine speed for various applications including PTO driven generators and pumps and has an internal
idle validation circuit that can be overriddenusing an input that allows for a fast idle activation.
Included in the package The throttle control is available alone or as a package shipped with the
following components.
interface module
vernier control
user manual
Operation
Variable Throttle Control When the interface has power provided by the interlock circuit, variable
engine control is available to the operator using the vernier control. If the vernier control is open more
than 10% when power is applied to the interface, the interface will maintain the engine at idle RPM until
the throttle is closed and then re-opened. This feature prevents sudden unexpected increases in
engine speed when the unit is initially activated.
High Idle Control An input (C4) is available to bring the engine speed to a pre-determined engine
RPM (High Idle) from a remotely mounted switch or load management device. When the interface is
powered up with this input active, the idle validation routine is bypassed and the interface will increase
the engine speed to the preset RPM. This speed can be set by an external potentiometer or resistor
network.
Installation
Control Module The interface module requires minimal space (3.63” x 4.75” x1.00”). The module
is watertight and may be mounted in any location that is not subject to extreme temperature or vibra-
tion.
Wiring The interface package comes with cables and leads to make the following connections:
Power and Ground
Engine Control Extension Cable
High Idle connector with leads
Refer to the diagrams in the manual for specific wiring requirements.
Refer to the engine manufacturer’s Electronic Application & Installation Guides for detailed information
on engine electrical interfacing.
Overview