Basler DECS-200 User Manual

3-10 Functional Description DECS-200
Figure 3-3. Soft Start Voltage Reference
LIMITER FUNCTIONS
DECS-200 limiter functions include an underfrequency limiter, V/Hz ratio limiter, overexcitation limiter,
underexcitation limiter, and a stator current limiter.
Underfrequency Limiter
When the generator frequency drops below the
corner frequency for the underfrequency slope
(Figure 3-4), the voltage setpoint is automatically
adjusted by the DECS-200 so that generator
voltage will follow the underfrequency slope and
an underfrequency annunciation occurs. The
underfrequency slope can be tuned to have zero
to three times the volts/hertz slope in 0.01
increments. The corner frequency can be set
across a range of 45 to 65 hertz in 0.1 hertz
increments. This adjustability enables the DECS-
200 to precisely match the operating
characteristics of the prime mover and the loads
being applied to the generator. The generator
underfrequency function may be effectively
disabled by setting the slope to zero. However, if
the system frequency is below the corner
frequency, underfrequency will be annunciated
even if the slope is set at zero.
Corner Frequency
GENERATOR VOLTS
GENERATOR FREQUENCY
P0004-34.vsd
12-03-01
0 %
100 %
Nominal
10 Hz
Figure 3-4. Typical Underfrequency
Compensation Curve

Basler DECS-200 Specifications

General

Brand	Basler
Model	DECS-200
Category	Controller
Language	English