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ESAC8B at SMIB unstable system.

Hi, im trying to simulate am GENSAL or GENSAE (50MW) with two branches at 1 p.u. to an infinite bus. When i try to implement the ESAC8B excitation system, my simulation gets unstable, with the graphs starting to move even before the fault. What can be the problem ?

This is the control that i'm trying to use:

1 'ESAC8B' 1 0.0000 28.500 18.000 3.6600 0.30000E-01 1.0000 0.0000 27.190 0.0000 0.72000 1.0000 1.0000 0.0000 1.2000 0.0000