MiniBus™ Digital Databus System Fault modes The MiniBus protects against these faults: 1. Short circuit or overcurrent Each output functions as a manually-resettable electronic circuit breaker with a delayed shutdown of approximately .05 seconds (to avoid false tripping due to a surge. ) Programmable trip currents: 2.0A, 3.0A, 4.0A, 5.0A, 7.5A, 10A, 15A, 20A 2. No Load Alarm The PDM senses the output current when the output is turned On. If there is no current, or very low current, the No Load signal is transmitted to the SIM. The programming software allows this function to be selectable. For some applications there may be a No Load condition when the output is turned On. 3. Thermal Shutdown The temperature of the PDM heatsink is monitored. If the temperature exceeds the design limit, the outputs will be shut down. Outputs can be programmed to shut down simultaneously, or in a priority sequence. 4. Communications Failure If the PDM senses a communications failure, it goes into 'default output status' mode. Outputs can be programmed 'Default On' or 'Default Off'.