Trailer Grounding And Protection From Electrostatic Discharge; Note During Servicing The Trailer; Welding Work On The Trailer; Vehicle Electrical Grounding Guidelines - WABCO iABS 2S/1M Standard Maintenance Manual

Safety Information

2.1 Trailer Grounding and Protection from Electrostatic Discharge

2.1.1 Note During Servicing the Trailer

Prevent potential resistance differences in grounding between components (such as axles) and the vehicle
frame (chassis).
Make sure that the resistance between metallic parts of the components connected to the trailer frame is
less than 10 Ohm (< 10 ).
Connect moving or insulated vehicle parts (such as axles) in a electrically conductive manner with the
frame.
Ensure a secure and adequate chassis ground at the J560 seven way connector ground pin on the trailer.
Use electrically conductive bolted connections when fastening the ECUs to the trailer frame.

2.1.2 Welding Work on the Trailer

Disconnect power to the trailer.
Disconnect all cable connections to devices and components and protect the plug-ins and connections from
contamination and humidity.
Always connect the grounding electrode directly with the metal next to the welding position when welding,
to prevent magnetic fi elds and current fl ow via the cable or components.
Make sure that grounding connections are robust by removing paint or rust at the connection points.
Prevent heat infl uences from the welding activity on devices and cabling when welding.
2.1.3 Note During Electrostatic Painting the Trailer Frame or Bogie
Disconnect all cable connections to devices and components and protect the plug-ins and connections from
contamination and humidity.

2.2 Vehicle Electrical Grounding Guidelines

Consult your trailer manufacturer (OEM) for further instructions on how to perform this task. This ensures
that the trailer OE warranty is not voided.
Ensure that the vehicle includes a correct common chassis ground point. A common chassis ground point
connects the trailer frame/chassis to the ground pin of the J560 seven-way connector and will protect the
vehicle electrical system from unwanted electrical noise.
Common chassis ground can be verifi ed by measuring the resistance between the J560 ground pin and the
vehicle chassis (or frame) and confi rming that the resistance is less than 10 ohm (< 10 ). If this is not the
case, the electrical contact at the common chassis ground point is not suffi cient or not present. If a common
chassis ground point is present, but not suffi cient, ensure that there is no paint or debris inhibiting electrical
contact at the ground point. If a common chassis ground point is not present, WABCO requires adding one.
Do not add more than one common chassis ground point (connecting the J560 ground pin to
the chassis) to avoid potential ground shifts within the vehicle electrical system. This could
potentially cause damage to the ABS ECU and other electric components on the trailer.
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