CG Drives & Automation, 01-7318-01r1 FDUL/VFXR/FDUG/VFXG/AFR/AFG Main features 43
Active/reactive power priority
AFR/AFG can be configured to prioritize the active or reactive power for the case when kVA (or current) limit is reached for
AFR/AFG unit. Prioritizing active power (P) means that reactive power (Q) will be limited to the AFR/AFG current capacity
available after producing/consuming the active power. Similarly prioritizing reactive power (Q) means that active power (P) will
be limited to the AFR/AFG current capacity available after producing/consuming the reactive power. P/Q priority can be
configured in menu [G283]. By default, AFR/AFG prioritize the active power over reactive power.
Lock-In and Lock-Out active power levels
Lock-In and Lock-Out active power levels can be configured for Q(U) and Cosθ (U) modes.
Lock-In active power level
Q(U) and Cosθ (U) modes are turned on when the actual (filtered) active power level is higher than the set value of lock-in
active power [G24B] or [G25B] respectively.
Lock-Out active power level
Q(U) and Cosθ (U) modes are turned off when the actual (filtered) active power level is lower than the set value of lock-out
active power [G24C] or [G25C]respectively.
Fig. 39 shows a typical example of lock-in and lock-out values for Q(U) mode.
Fig. 39 Example of lock-in and lock-out values for Q(U) mode.
(Source IEC 50549-2)
NOTE:
Hysteresis between lock-in and lock-out is available
only if lock-in is higher than the lock-out value. In that
cases, the difference between lock-in and lock-out
acts as a hysteresis.
Q(U)
Q=0
P
PP
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