It is highly recommended to mount the unit vertically with the terminal blocks pointing downwards to minimize dirt, debris, and moisture accumulation on the electrical connections. 3. Wiring Diagrams and Terminal Connections
Connection point for the armature plug diode/bypass circuit or specific field configurations. Low-Power Control Wiring (Multi-Pin Plug)
: You can set intervals for service alerts (e.g., oil changes, motor checks).
Here are some key features and specifications of the Curtis 3501 controller, as outlined in the manual: curtis 3501 manual
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If your vehicle fails to move, the Curtis controller usually protects itself by disabling output. Use this step-by-step diagnostic checklist to find the root cause: Step 1: Check Battery Voltage
Typically available in 24V, 36V, or 48V configurations. It is highly recommended to mount the unit
Connects to the main battery negative terminal or vehicle chassis ground.
The Curtis Model 3501 is a highly sophisticated, microprocessor-based motor speed controller designed for smooth, silent, and cost-effective speed and torque control of electric vehicles. Commonly utilized in material handling equipment, golf carts, and small industrial utility vehicles, this controller ensures peak performance and maximum battery efficiency.
Users can set and reset up to three different maintenance (MM) intervals to track service needs. Curtis Instruments Pin Assignments (Main 16-Pin Connector) SCI Rx (Communication) Switch Input 3 / Fault Code KSI (Key Switch Input) CAN_L (Controller Area Network) MOSFET Output CAN_L Termination SCI Tx (Communication) Switch Input 1 / Frequency 1 (Varies by model) Operational Notes BDI Tracking: Low-Power Control Wiring (Multi-Pin Plug) : You can
IP65 front panel protection against dust and water ingress when mounted correctly. 2. Mounting and Physical Installation
The Ultimate Guide to the Curtis 3501 Controller: Manual, Troubleshooting, and Specs
Dictates how quickly the vehicle coasts down when the throttle is completely released. 0.2s – 5.0s 1.0s (Moderate stopping distance)