Cervis TM70 Manual de Instalação descarregar pdf (Página 78)

TM70/3-10 & i-Kontrol Console RC System

U035.3-TM70_Console_Sys

23.0 A2ICAN Option

The CANopen interface controlled A2ICAN expansion board provides an analog output current

for Pulse Width Modulation (PWM) control of electro-hydraulic proportions valves. The board has

two isolated output stages isolated from each other and common control logic.

Figure 47. A2ICAN Block Diagram

The A2ICAN board has its own microprocessor (µP) that performs the following functions:

• Provides two (2) analog outputs with individual instruction sets

• Communicates with the LR72 board using CANopen input/output digital/analog 401

standard profile (CI DS401 – CANopen Device Profile for Generic I/O Modules).

23.1 Response Curve

The A2ICAN expansion board has two (2) types of response curves for each output:

• Linear, where the response of the analog output is proportional to the input

• Non-linear, where the response of the analog output is exponential to the input. Variations

of joystick input at the beginning of movement result in small changes of output, while the

same joystick input variations result in major changes in the output current towards the end

of the joystick movement.

Choice of response curve is made by changing parameter P — changed by programming the

EEPROM or by Tele-Alignment — where 0 represents a linear response and 1, 2, or 3 is chosen

for an exponential response (from low to high, respectively).

CAN bus

CANopen

Protocol

LR72

Receiver

Logic

Board

A2ICAN

VPP2

GND2

VO2

VR2

VPP1

GND1

VO1

VR1

PWM1 VO1

CONTROL LOGIC BOARD ( µP )

+ Vi

PWM2 VO2

ISP

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Cervis TM70 Manual de Instalação Página 78