Note, most cables are connected to the normally-open side of the switch. Also note the connection to each motor, the red and green plugs are inserted as shown when the grooved side of the motor is facing you. The interface unit uses CMOS components that require very little power it can sometimes appear that the interface is working because the inputs seem to respond. Always double check that the power supply is plugged in and powered-up when the interface inputs appear erratic in operation. Before running the model s program, run the diagnostic program and check that all inputs and outputs work.
Most errors are due to incorrectly wired switches, or motors with the wrong polarity.
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