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Limiters DECS-150
UEL Voltage Dependency
The levels entered for the user-defined curve are defined for operation at the rated machine voltage. The
user-defined UEL curve can be automatically adjusted based on machine operating voltage by using the
UEL voltage dependency real-power exponent. The user-defined UEL curve is automatically adjusted
based on the ratio of the machine operating voltage to the machine rated voltage raised to the power of
the UEL voltage dependency real-power exponent. UEL voltage dependency is further defined by a real
power filter time constant that is applied to the low-pass filter for the real power output.
UEL Shutdown
When this setting is enabled and the UEL limiter is active, the DECS-150 will shut down after the
shutdown delay time expires.
UEL configuration settings are illustrated in Figure 9-7.
Figure 9-7. UEL Configure Screen
UEL Curve
Underexcitation limiting is implemented through an internally-generated UEL curve or a user-defined UEL
curve. The internally-generated curve is based on the desired reactive power limit at zero real power with
respect to the machine voltage and current rating. The absorbed reactive power axis of the curve on the
UEL Custom Curve screen can be tailored for your application.
A user-defined curve can have a maximum of five points. This curve allows the user to match a specific
machine characteristic by specifying the coordinates of the intended leading reactive power (kvar) limit at
the appropriate real power (kW) level.
UEL configuration settings are illustrated in Figure 9-8.
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