If the amperage load on any given common lug exceeds the transformer capacity, the circuit breaker will trip and the display will read ”Err” (Error). Test the amperage load on all cables on the common lug using an amp clamp. Test each individual cable on the common lug with the amp clamp. To remedy an overload, either reduce the wattage of the lamps in the fixtures or rebalance the amp load between commons.
Short Circuit
The LCD will read “Err” (for Error) and shut off power if there is a short somewhere in the cabling. This message will continue to be displayed until any button is pressed. To test for a short circuit, check each cable on the common tap that is tripping individually.
Example: A circuit with 100 watts of load (five 20 watt fixtures) should have an amp reading of approximately 8 amps. If the cable is reading significantly more, it has a short somewhere in the cable.
NOTE: Shorts and overloads are NOT covered by the FX warranty and can only be detected when the transformer is tested in the field
