Installation Manual

Electrical & Electronic Application And Installation Manual
Production Release Version 1.0
Page 175
13.2 Gauge Drivers
If a needle type analogue gauge is required to display an engine parameter
such as engine speed, oil pressure, or coolant temperature, it is
recommended that the OEM use a gauge or display that can use the
parameters broadcast by the ECM on the J1939 datalink.
As an alternative, traditional single wire gauge ‘senders’ may be used if a
suitable tapping is available. If this implementation is required, please contact
the Electronic Applications team to discuss requirements.
A traditional tacho signal may be obtained from the ‘W’ terminal of the
alternator, although this will not be as accurate as the value transmitted on the
J1939 datalink.
13.2.1 Datalink Driven Intelligent Displays
J1939 enabled operator display / gauge units can be connected to the engine
J1939 datalink. Perkins offers lamp information, which conforms, to the J1939
standard PGN and SPN messaging system. For more information on the
J1939 messages supported via the ECM J1939 data bus please refer to
section 18 of this document.
Devices that are connected to the J1939 datalink should meet the following
standard if the OEM does not intend fitting the indicator lamps.
13.2.2 Minimum Functional Specification for J1939 display.
The following points describe the functional specification for the installation of
an operator display.
• The display is always on when the engine is running.
• The display should be in the line-of-sight of the machine operator
during machine operation.
• Display of the whole J1939 fault code including Suspect Parameter
Number (SPN), Failure Mode Indicator (FMI) and occurrence number.
• Clear indication of what action, if any the operator is required to take.
• Display of engine speed.
• Audible or bright lamp warning when a new fault code is detected.
• The scaling of any gauges (e.g. coolant temperature) should be such
that the needle is not far to the right of vertical when the engine is in
normal operation (this would give the impression that the engine was
abnormally hot, when in fact it is running within its design limits).
Perkins will under no circumstances change the engine J1939 implementation
in order to resolve compatibility issues with gauges or displays other than
those supplied directly by Perkins.
Gauge manufacturers may contact the electronic applications team however,
for information and assistance in ensuring that their products are compatible
with the engine ECM.