Class1 Vernier Throttle for CAT User Manual

101057 rev. C

VERNIER THROTTLE SYSTEM

for

Caterpillar Engines

Class1

607 NW 27 Ave.

Ocala, FL 34475

Ph: [phone]

Fax: [phone]

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Overview

Throttle Interface Control Module

System Overview

The

Class1

as the Felsted Electronic Vernier II Control) and other potentiometer controls to be used with electroni­cally controlled engines. This unit will work with electronically controlled Caterpillar Engines (C10,
C12, 31 16, 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.

Vernier Throttle Interface is designed to allow industry standard vernier style controls (such

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 vibra­tion.

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.

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Interlocks

Class1 provides a variety of engine controls that are used in a broad range
of applications, therefore it is impossible for Class1 to determine the suitabil­ity of a particular control for any specific application. The flexibility of our
products allows them to be used in a limitless number of custom applications.
Class1 can advise you of the features that are available on a given product
so that you can determine what product will meet your needs. We believe
that the Original Equipment Manufacturer’s (OEM) engineering departments
should be qualified experts in their product field and are the authorities on
product application and safety. Since our products are typically used in safety
critical applications, the OEM must undertake appropriate testing to prevent
injury to the end user.

WARNING

!

NOTE: The interlock schemes shown in this manual are examples only and may not be suit­able for specific applications. The throttle interface is active whenever power is applied.

IT IS THE PURCHASER’S RESPONSIBILITY TO DETERMINE
THE SUIT ABILITY OF ANY PRODUCT FOR AN INTENDED
APPLICA TION, AND TO INSURE THA T IT IS INST ALLED
AND GUARDED IN ACCORDANCE WITH ALL APPLICABLE
FEDERAL, ST ATE, LOCAL AND NFP A SAFETY AND HEALTH
REGULA TIONS, CODES AND ST ANDARDS.

Special Programming The ECM must be programmed for remote throttle operation and there

are several considerations including vehicle speed and max RPM that need to be configured.

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Connectors

Throttle Interface

for

Caterpillar Engines

Connector Information

C1 Connector 12015792 T erminal 12089188 Seal 12015899

Position Wire Color Description
A Red Throttle Interlock
B Black Ground

C1

C2

C3

C4

C2 Connector 12015793 T erminal 12089188 Seal 12015899

Position Wire Color Description
A White Throttle ground
B Blue Throttle Signal
C Orange Throttle Source

C3 Connector 12010973 T erminal 12089040 Seal 12015899

Position Wire Color Description
A Yellow PWM Signal

C4 Connector 12015791 T erminal 12089188 Seal 12015899

Position Wire Color Description
A Green Fast Idle*

* This input bypasses idle validation and allows the interface to command engine speed as
soon as power is applied.

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