The converter and the load shall be protected against inductive voltage surges by a crowbar, which short-circuits the load and provides a safe path for the load current. The crowbar could be bidirectional in current and voltage. Crowbar triggering is passive and active:

• Passive triggering: overvoltage (BOD),
• Active triggering: signal from the RegFGC3 control,

The RefgFGC3 crate Type 10 is able to control up to four 3-phases IGBT inverters and four active crowbars. The control signals are generated by the DSP_REGULATION board (PWM control) and the VS_STATE_CONTROL board (Active Crowbar Control). These control signals are merged on the backplane and routed to four Burndy connectors 19 points (SKPULSES_x, x= A…D). Each SKPULSES cable is then connected to an Interface card (EDA-02812) to split the control signals of the IGBTs (PWM) and the control signals of the crowbar which is then routed to the Active Crowbar Board (EDA-02811). An interface board (EDA-02883) with optic fiber interface also exists.