9440300990 11-9
DECS-250 Limiters
Figure 11-10. Stator Current Limiter Settings
Var Limiter
BESTCOMSPlus Navigation Path: Settings Explorer, Operating Settings, Limiters, var
HMI Navigation Path: Settings, Operating Settings, Limiters, VAR
The var limiter can be enabled to limit the level of reactive power exported from the generator. Primary
and secondary setting groups provide additional control for two distinct machine operating conditions. The
var limiter setpoint is expressed as a percentage of the calculated, maximum VA rating for the machine. A
delay setting establishes a time delay between when the var threshold is exceeded and the DECS-250
acts to limit the var flow.
Var limiter settings are illustrated in Figure 11-11.
Figure 11-11. Var Limiter Settings
Limiter Scaling
BESTCOMSPlus Navigation Path: Settings Explorer, Operating Settings, Limiters, Scaling
HMI Navigation Path: Settings, Operating Settings, Limiters, Scaling
Automatic adjustment (scaling) of the overexcitation limiter and stator current limiter is possible through
the DECS-250 auxiliary control input. Limiter scaling settings are illustrated in Figure 11-12. OEL and
SCL scaling may be independently enabled and disabled. Automatic adjustment of the OEL and SCL is
based on six parameters: signal and scale for three points (levels).
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