GE IS210AEABH1AAA Relay card

Check actuator linkage to steam controlling mechanism for any lost motion, binding, or excessive loading. Verify a steady steam pressure of proper value. Check actuator per appropriate actuator manual. Prime mover not operating properly. Prime mover may be causing speed variations. Control turbine manually to determine if instability is in prime mover or governor control. Verify proper adjustment of steam control linkage

Prime mover not receiving steam as called for by the governor. 

If voltage to actuator is maximum, visually determine if actuator shaft is at maximum position. If it is not, an actuator problem is indicated, or the linkage or steam system is restricted. Unequal speed settings. Be sure that speed settings of all units at no load are identical. Unequal load gain voltages. With the prime mover operating in single unit configuration, LOAD GAIN must be set at 6.0 Vdc.

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