9492600990 9-7
DECS-150 Limiters
Figure 9-8. UEL Custom Curve Screen
Stator Current Limiter
BESTCOMSPlus Navigation Path: Settings Explorer, 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 machine. 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-150 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 9-9).
Figure 9-9. Stator Current Limiting
Settings that are related to machine ratings can be set in either actual units of current or in per unit
values. When a native unit is edited, BESTCOMSPlus automatically recalculates the per unit value based
on the native unit setting and the rated data parameter (on the System Parameters, Rated Data screen)
associated with it. When a per unit value is edited, BESTCOMSPlus automatically recalculates the native
value based on the per unit setting and the rated data parameter associated with it.
Once all per unit values are assigned, if the rated data parameters are changed, BESTCOMSPlus
automatically recalculates all native unit settings based on the modified rated data parameters.
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