Curtis 1520 Controller Manual Link

The manual opens with stark warnings. Pay attention to:

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Periodically check that the heavy-duty power cables (B+, B-, U, V, W) are torqued properly to prevent arcing. The manual opens with stark warnings

The manual’s parameter tables become a psychological mirror: they reveal what the original equipment manufacturer (OEM) prioritized—smoothness, battery economy, or brute torque. I should search for relevant sources

The manual specifies that the 1520 does have internal 120-ohm termination. If it is the only device on the CANbus, you must add an external resistor across CAN-H and CAN-L. Otherwise, communications will be intermittent.