High-country-tek DVC80 Manual de usuario descargar pdf (Pagina 160)

P/N: 021-00154, Rev. A.6 - updated for V4.7 Tools Page | 160

Appendix F Flowchart (Sequence of Operations) example

This example will demonstrate how to create a flowchart and Sequence of Operations. This example may or

may not work, it is for educational purposes only.

Programming Team:

Paul – Programmer, Electrical Engineer

Mark – Program Manager

Amanda – Application Engineer

Todd – Hydraulics Engineer

Date: 6/4/08

Program Description:

Using the HCT DVC family, control steering and propulsion functions of a new skidsteer model

Using a j1939 equipped diesel engine.

Functional Description:

The operator has control over one joystick. Critical functions are the engine rpm > 1000rpm and high

side pressure is below 2000psi, then the system looks for input from the joystick as indicated below.

Joystick has 5 positions

Joystick forward – skidsteer moves forward motion

Joystick back – skidsteer moves in reverse motion

Joystick right – skidsteer turns right

Joystick left – skidsteer turns left

Joystick center – skidsteer stops in present position

I/O needed

Inputs Joystick forward digital input 1, active high

Joystick back digital input 2, active high

Joystick right digital input 3, active high

Joystick left digital input 4, active high

Joystick center digital input 5, active high

Left wheels, high side press. Trans 0-3000psi transducer, 0-5v, 0-100% input

Right wheels, high side press. Trans 0-3000psi transducer, 0-5v, 0-100% input

Engine load j1939 signal

Engine rpm j1939 signal

Outputs

Left wheels pump forward control pwm Min cur 0.2a, Max cur 0.9a

Left wheels pump reverse control pwm Min cur 0.2a, Max cur 0.9a

Right wheels pump forward control pwm Min cur 0.2a, Max cur 0.9a

Right wheels pump reverse control pwm Min cur 0.2a, Max cur 0.9a

Turning left indicator, bang bang out LED indicator along with standard relay

Turning right indicator, bang bang out LED indicator along with standard relay

Step #1 Assure engine rpm is above 1000rpm

Assure high pressure, left wheel system < 2000psi

Assure high pressure, right wheel system < 2000psi

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High-country-tek DVC80 Manual de usuario Pagina 160