Electrical Interface of Volvo Penta Engines

Electrical interface of Volvo Penta Engine

General

This document describes how the Volvo Penta industrial engines equipped with the control systems EMS and EMS2 may be controlled. There are a number of interfaces available to control

the engine. The interfaces are:

• Bus interface

• CIU

• DCU

The common thing about the three first interfaces is that the engine is controlled over two serial communication buses. The CIU and DCU uses the bus interface to communicate with the engine.

IMPORTANT!

If non Volvo Penta equipment is connected to the communication buses there is always a risk that the safety of the system is jeopardized.

Abbrevations

BAM Broadcast Announce Message CAN Controller Area Network

DEF Diesel Emission Fluid

EATS Engine After Treatment System

EIC Engine Interface Connector

EECU Engine Electronic Control Unit

EMS Engine Management System

EMS 2 EMS used on TAD734GE, D9,

TAD125xVE, D13 and D16 engines

FMI Failure Mode Identifier

OEM Original Equipment Manufacturer

SPN Suspect Parameter Number

VP Volvo Penta

Relevant dokumentation

• 7748665

Electrical interface specification industrial engines

EMS and EMS2

• SAE J1939-73

• SAE J1939-71

Engine control interface

Volvo Penta industrial engines can be controlled in three different ways. Via bus interface, CIU or DCU. The bus interface is used by those who makes there own control system that and wants to control the engine over SAE J1939 and J1587. Volvo Penta provided two different systems to control the engines, CIU that provides a number of digital/analogue outputs to control the engine. And DCU that has all buttons included in the unit but still provides some digital/analogue inputs and outputs.

CIU

This is the interface for those who wants to make there control panel or non bus based control unit.

DCU

This is the interface for those who wants a complete

unit that is ready to run the engine without make any button. But the possibility to make some customization is still here. The DCU is equipped with a display that shows engine data and diagnostics translated to text.

Electrical interface

Bus interface

8-pole deutsch connector recepticle.

Pin Description

1 CAN H

2 CAN L

3 Battery –

4 Battery +

5 Ignition and stop request if energized to run

6 Stop request energized to stop

7 J1587A

8 J1587B

CIU

The electrical interface to the CIU is 42-pole AMP connector.

Pin Description Pin Description

1 Idle request 22 J1587A

2 Potentiometer ground 23 Not used

3 Potentiometer signal 24 Preheat indication(1)

4 Not used 25 Coolant level alarm

5 Not used 26 Oil pressure alarm

6 Not used 27 Battery +

7 Over speed indication(2)

Buzzer (3)

28 Ignition (key switch)

8 Easy link bus 29 Governor mode request

9 Coolant temperature alarm 30 Potentiometer supply

10 Battery alarm 31 Not used

11 CAN L 32 Not used

12 CAN H 33 Tachometer

13 Gauge power supply 34 Coolant temperature gauge

14 Battery – 35 Start request

15 Frequency select(4) 36 Diagnostic indication

16 Diagnostic switch 37 J1587B

17 Preheat request(5) 38 Running indication(6)

18 Not used 39 Fuel alarm

19 Engine protection override req. 40 Oil temperature alarm

20 Oil temp gauge 41 Stop request

21 Oil pressure gauge 42 Not used

There is a cable harness available with all wires connected that applies to the above table.

All indicators shall be less than 3W. All switches are active when shorted to battery+.

DCU

Connector 1, 8-pole deutsch connector.

Pin Description Pin Description

1 CAN H 5 Ignition and stop request if energized to

run

2 CAN L 6 Stop request energized to stop

3 Battery – 7 J1587A

4 Battery + 8 J1587B

Connector 2, 12-pole deutsch connector:

Pin Description Pin Description

1 External stop 7 Throttle + (10V)

2 External Start / Ignition 8 Throttle input

3 LSS1 (Buzzer) 9 Throttle –

4 Easylink gauge power 10 LSS2 (Running indication)

5 Easylink Data 11 LSS3 (spare)

6 Easylink Ground

All indicators shall be less than 3W. All switches are active when shorted to battery +.

Power up sequence

The system powers up when the ignition is switched

on.

Start

A start request is addressed by the start signal. The engine will then start to crank and it will continue to do so until one of the following conditions becomes true.

• The start signal goes inactive.

• The engine speed exceeds a stated limit, typical about 480 rpm.

• The cranking time exceeds a stated limit, typical about 20 s. 30 s for genset engines.

Bus interface

Associated message:

J1939: Start request in VP Status

J1587: Start request in PPID 98

CIU

Associated hardware/input:

Start request.

DCU

Associated hardware/input:

Start request.

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