CANplus
TM
CP1000
Installation Manual
10
9M01-1000-A401-EN
Revision B
4
Typical Wiring
The following subsections describe the typical engine interface wiring.
4.1 Power and Ground
The panel’s Power and Ground must connect directly to the battery posts and must not share power and ground
wiring with any other devices, especially any high current loads. The Power line should have overcurrent
protection in the form of current-limiting devices, fuses, circuit breakers or fusible links to protect the harness
wiring in the event of fault conditions.
4.2 ECU Power Out
The CP1000 can directly power the engine ECU.
4.3 Starter Power Out
The Starter Power Out is intended to power the starter relay, which is required. When power is removed from the
relay coil, the collapsing magnetic field generates a negative voltage surge. Negative voltage surges can damage
components. The CP1000 has protection against these negative surges. However, it is still required to have a
protection/suppression diode as close to the relay as possible. Cattron recommends the use of relays that have
this protection/suppression diode built in. The protection/suppression diode must have sufficient voltage ratings to
survive and sufficiently suppress these negative voltage surges. Cattron recommends a 1N4001 diode. Cattron
sells a spike-suppressing diode kit (Part Number 630-4007-77).
4.4 Resistive Senders
The Resistive Sender connections send system voltage out to the sender to obtain the current value. It is required
that the sender return connection be connected to a ground point (the engine chassis, for example), as close to
the sender as possible in order to get an accurate measurement. If more than one sender is used, each sender
should have a sender return connected to a ground point near that particular sender. All sender returns should
then be connected together near the panel and the combined returns connected to the panel’s sender return
input.
4.5 CAN Bus Termination
CAN b
us requires two 120 Ω termination resistors each at the extreme ends of the wiring harness. Typically, the
engine ECU provides the termination resistor on its end (see the engine documentation to verify). The CP1000
has a termination resistor that can be turned off and on as needed. The CP1000’s default configuration has this
termination resistor turned on.
