Installation Manual

Electrical & Electronic Application And Installation Manual
Production Release Version 1.0
Page 32
4.2 System Voltage & Current Requirements
Each Tier 4 Final/Stage IV engine comes supplied with an engine ECM
controller and an SCR dosing control unit. Each controller has its own specific
electrical requirements which need to be met for correct system operation.
These electrical characteristics are shown in the following sections.
4.2.1 Engine ECM
The ECM power supply requirements must be carefully considered when
designing the engine power supply circuit. There are specific limitations that
must be considered in the design to ensure a reliable consistent power supply
to the engine electronic components. The table provides the electrical
characteristics and limitations for the A5:E2v2 & A5:E12 ECMs.
VOLTAGE SUPPLY SYSTEM
1206F 1204F
12V 24V 12V 24V
Peak Current Cranking 7.88A 6.38A 6A 5A
Max RMS Current* 19A 16A 16A 12A
Suggested Fuse Rating** 25A 25A 25A 25A
Sleep Current <10mA <10mA <10mA <10mA
Key On Current Engine Off <1A <1A <1A <1A
Min Running Voltage 9V 18V 9V 18V
Max Running Voltage*** 16V 32V 16V 32V
Minimum Batt Voltage during
Cranking ****
7.3V 7.3V 7.3V 7.3V
Maximum total ECM power
circuit wire resistance
50mOhm 100mOhm 50mOhm 100mOhm
Target circuit resistance 40mOhm 80mOhm 40mOhm 80mOhm
Table 4.1 ECM Voltage & Current Requirements
* All Current measurements have been taken from Tier 4F 1204F – 1206F
Electronic System – ECM Current Draw for Engine Alternator Sizing and are
estimations only. RMS current will vary with engine speed (assuming constant
voltage) no Lamp Drivers or application side components were fitted during
measurement and will therefore need to be accounted for.
** Suggested fuse rating are based on automotive blade type fuses and are
for guidance only.
***The ECM can survive higher voltages. ECM will survive for at least 5
minutes on a supply voltage of 60V.
**** Please refer to the Starting and Charging System guidelines for more
information regarding the engine starting system installation requirements.
4.2.2 1204F DEF System