electronic speed control

[sarah00]

I have an 04 ezgo electric pds cart.... how can i check to see if the electric speed controller is fried or not? just put new solinoid on and still have nothing. i am asuming it is the contoller.

[golfcartg]

Let's break down how we can diagnose if the speed controller is causing the issue. In a PDS system, the controller plays the role in controlling the solenoid, which is basically the cart's high current power switch. Now getting the solenoid to click involves a two step process that's unique to PDS carts. First, certain conditions need to be met: the Reef switch, Run/Tow switch, Key switch, and one set of contacts in the F/R switch must be closed to send Battery Positive (B+) to one side of the solenoid coil. This simply prepares the solenoid to engage. Secondly, if, under these conditions, the contacts in the Pedal switch also close, the controller sends Battery Negative (B-) to the other side of the solenoid coil, causing it to activate and complete the circuit, allowing power to flow to the motor.

Now, to check if the electric speed controller is causing the issue we'll need to assess each component involved in this process. Start by inspecting the Reef switch, Run/Tow switch, Key switch, and F/R switch to verify they're functioning correctly and closing the necessary contacts. Check for any loose or damaged wiring connections as well, as these can disrupt the flow of power. If all switches and connections check out, the next step is to verify if the controller is sending the right signals. You can do this by using a multimeter to test for voltage at the controller's output pins (J1 Pin-7 for B+ and J1 Pin-6 for B-) while the cart is in operation. If you're not getting the expected voltage readings, it could indicate a faulty controller.

With this process we can narrow down the cause of the issue and determine if the controller needs to be replaced. To set up your multimeter for testing voltage at the controller's output pins, locate the dial or selector switch on the front and set it to the "Voltage" or "V" position. Then, insert the red probe into the port labeled "VΩmA" or "Voltage" and the black probe into the port labeled "COM" or "Common." Check the voltage range setting and adjust it to a higher range, such as 20V or 200V suitable for testing battery voltage. Once set up, identify the controller's output pins and place the probes on the appropriate pins. Observe the voltage reading on the screen, and verify it corresponds to the expected output level.