Rotor Position Feedback; Canbus; All Other Low Power Wiring; Protected Voltages - Kohler Curtis F Series Manual

Curtis AC F2-A, F4-A, F6-A Motor Controllers – FOS 4.5 – April 2022
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Rotor Position feedback

The rotor-position sensor's wiring (+5V, Feedback A, Feedback B, and Ground) should be bundled
together between the motor and controller. These wires are often run with the rest of the low current
wiring harness without interference issues, but the encoder wires should not be routed near the motor
cables. In applications where this is not possible or there is signal interference, twist the encoder
signal wires. In cases using a shielded cable (e.g., shielded 2-wire twisted-pair with drain-wire), only
ground the shield-drain wire at the controller ground. In cases where this is not possible, consider
a different controller.

CANbus

Use twisted-pair wires for the CANbus connections. Keep the CAN wiring away from the high
current cables and cross them at right angles when necessary. In extreme cases, use shielded cable
with the shield connected to the controller I/O ground and only on the controller side for the non-
isolated controller models.
The 35-pin AMPseal controllers allow the implementation of both 11-bit identifiers (CANopen)
and 29-bit identifiers (e.g., J1939), and/or different baud rates to support a high-speed CANbus for
safety or data logging.
An isolated CAN option uses a separate (isolated) CANbus ground reference, which is useful on
vehicles with CANbus systems operating at different battery voltages. It avoids common mode noise
issues. The isolated ground is provided for twisted pair shielding, and may not be needed. When
using shielded wiring, only connect the shield's drain-wire to isolated ground. On controllers with
two CAN ports, the option always includes both CAN1 and CAN2 as isolated CAN.

All other low power wiring

Use standard vehicle-harness routing practices for the remaining connections. When designing the
vehicle's wiring and routing, keep the inputs such as the throttle, temperature, and the motor feedback
signals separate from controller's output lines such as the coil driver outputs. Avoid routing the low-
power wiring parallel to the high power (and high current) battery and motor cables.

Protected voltages

The low-power pins' protected voltage ratings listed in Tables 4 and 5 are absolute and are not for normal
operation. To prevent damage to the controller, do not connect (i.e., short circuit) the Coil Supply to
battery negative. Further, do not connect (i.e., short circuit) the I/O Ground to battery positive.
pg. 12 2 — INSTALLATION AND WIRING