What happens when a servo jams?
The ServoStation is quite conservatively rated and chances are that even with a jammed servo drawing several Amps, the 6 volt rail will remain stable. If something has gone horribly wrong and there is an absolute short-circuit to ground, then things become more interesting. The ServoStation will reach its current limit, which at 25°C is about 8 Amps. If the fault doesn’t clear with 8 Amps running through it then things are pretty grim. The ServoStation will try plan B and start hiccupping. This involves briefly shutting down the 6 volt regulator and then restarting it. Hiccupping will continue until the short-circuit clears.