9440300990 11-7
DECS-250 Limiters
Figure 11-8. UEL Custom Curve Screen
Stator Current Limiter
BESTCOMSPlus Navigation Path: Settings Explorer, Operating Settings, Limiters, SCL
HMI Navigation Path: Settings, Operating Settings, Limiters, SCL
The stator current limiter (SCL) monitors the level of stator current and limits it to prevent stator
overheating. To limit the stator current, the SCL modifies the excitation level according to the direction of
var flow into or out of the generator. Excessive stator current with leading power factor calls for increased
excitation. Excessive stator current with lagging power factor calls for reduced excitation.
The SCL can be enabled in all regulation modes. When operating in Manual mode, the DECS-250 will
announce high stator current but will not act to limit it. Primary and secondary SCL setting groups provide
additional control for two distinct machine operating conditions. Stator current limiting is provided at two
levels: low and high (see Figure 11-9). SCL settings are illustrated in Figure 11-10.
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