jcb EcoMAX - Control Unit Power Strategy; Electrical Integration; Environmental Requirements; Ancillary Earth Requirements

JCB EcoMAX Engine Installation Manual
© JCB Power Systems Ltd. 320/A9164-1 Page 37 of 64
13.4 Control Unit Power Strategy
The ECU requires a 6 V to 16 V supply. It must not be connected to a 24 V equipment
supply. A 24 V to 12 V converter is available from JCB Power Systems Ltd for use on
equipment with a 24 V electrical system.
Never supply power to the electrical loads without the ECU being properly grounded.
13.5 Electrical Integration
13.5.1 Environmental Requirements
The ECU is sensitive to temperature so you must not expose it to temperatures that cause
the case to exceed 112°C or the internal circuits to exceed 125°C.
N NOTE: These internal temperatures cannot be measured and are for information
only.
To avoid potential EMC issues, you need to arrange the harness routing as follows:
 Avoid close proximity to high current loads such as starter motor, alternator,
and so on.
 Lie as close to the machine chassis as possible to make use of the natural
screening effect – discontinuities in the chassis metalwork to be avoided.
 The wire from Machine Connector pin 2 to the Power Hold relay does not
exceed 2 metres.
 Do not use un-terminated communication wires.
 Make sure the power wires are closely coupled so that the communication
wires are as far as possible from the power wires.
 Avoid continuous lengths of wires in one plane greater than 1 metre.
 Avoid the proximity of different signal characteristics – that is to say,
switched, power and data signals.
13.5.2 Ancillary Earth Requirements
Connect any ancillary components, which have an electrical ground requirement, through the
equipment chassis. Make sure that these earth wires are kept as short as possible to avoid
EMC issues.
13.5.3 Emergency Stop Switch
If your application needs an emergency stop please contact JCB Power Systems
Applications department for more information and advice.
The IPU and tank module require battery power up to 40 seconds after the ignition is turned
off to purge the system of DEF. This process must not be affected by the isolation or
emergency stop systems.
13.5.4 Wiring Requirements
DC resistance between the battery and the ECU must be minimised to avoid voltage drop at
a peak current of approximately 15 A for the supply wire and 15A for the return.
Use a maximum resistance of 40 mΩ (total supply and return). Make the ‘splice’ (4 wires to 1