Basler Electric DGC-2020HD - Manual (Page 308)

298 9469300990 Rev B
Maintenance and Troubleshooting DGC-2020HD

Speed Bias: This is the normalized value to which the DGC-2020HD drives the governor analog
bias output. If the value is
–1.0, the output will be driven to the minimum value of the governor
bias output range. If the value is 1.0, the output will be driven to the maximum value of the
governor bias output range. If the value is 0.000, the output will be driven to the midpoint value
(i.e. half way between maximum and minimum values) of the governor bias output range. If the
generator breaker is open, or if the generator breaker is closed and speed trim and kW control
are disabled, the output from the DGC-2020HD will be the midpoint of the range, indicating the
generator should run at rated speed. Any relay contacts that are used to switch load share lines,
governor analog speed bias signals, or voltage regulator analog voltage bias signals must use a
relay intended for low voltage, low current applications to preserve signal integrity. Signal relays,
not power relays, must be used for this application.

Voltage Bias: This is the normalized value to which the DGC-2020HD drives the voltage regulator
analog bias output. If the value is
–1.0, the output will be driven to the minimum value of the
voltage regulator bias output range. If the value is 1.0, the output will be driven to the maximum
value of the voltage regulator bias output range. If the value is 0.00, the output will be driven to
the midpoint value (i.e. half way between maximum and minimum values) of the voltage regulator
bias output range. If the generator breaker is open, voltage trim and kvar control are disabled, so
the output from the DGC-2020HD will be the midpoint of the range, indicating the voltage
regulator should operate at rated voltage. Any relay contacts that are used to switch load share
lines, governor analog speed bias signal, or voltage regulator analog voltage bias signals must
use a relays intended for low voltage, low current applications to preserve signal integrity. Signal
relays, not power relays, must be used for this application.

Watt Demand: This is the normalized kW demand requested by the DGC-2020HD. It is the
desired amount of power that the generator produces. It is normalized such that 1.0 indicates the
full kW capacity of the generator, 0.5 indicates 50% of the generator’s capacity, etc. When the
generator breaker is closed, and the kW controller is enabled, the Watt Demand indicates what
level of power should be generated. In an island load share system, this will correspond to the
value read on the load share lines. If the load share lines are at the 50% point of the load share
voltage range, the Watt Demand will be 0.50. If the generator breaker is closed, and the Parallel
To Mains logic element is true, the Watt Demand will be equal to the base load set point. When
the generator breaker is open or the kW controller is disabled, the Watt Demand will always be
equal to the value calculated from the voltage that the DGC-2020HD sees on its load share line.

kW Total: This is the normalized kW being produced by the generator. A value of 1.0 represents
full machine capacity, 0.5 represents 50% of machine capacity, etc.

Rated kW: This is the rated kW of the machine that should be equal to the Rated kW setting
under Settings, System Parameters, Rated Data.

var Demand: This is the normalized var demand requested by the DGC-2020HD. It is the desired
about of var that the generator should produce. It is normalized such that 1.0 indicates the full var
capacity of the generator, 0.5 indicates 50% of the generator’s capacity, etc. When the generator
breaker is closed, and the var/PF controller is enabled, the var demand indicates what level of
reactive power should be generated. If the generator breaker is closed, and the Parallel To Mains
logic element is true, the var Demand will be equal to the kvar set point (%) if the controller is in
var control mode, or will equal the var value that will maintain the machine Power Factor at the
PF set point if the controller is in Power Factor mode. When the generator breaker is open or the
var/PF controller is disabled, the var Demand will always be 0.0. When running with the generator
breaker closed and the Parallel To Mains logic element is false (i.e. the generators are an
islanded system), the var Demand will be 0.0 as well. The DGC-2020HD runs in var Droop when
on an island system.

kvar Total: This is the normalized kvar being produced by the generator. A value of 1.0
represents full machine capacity, 0.5 represents 50% of machine capacity, etc.

Rated kvar: This is the calculated rated kvar of the machine, calculated from the rated kW of the
machine and the rated power factor of the machine according to var is equal to the square root of
(VA
2 – Watt 2 ).

Load Share Active: This indicates when the load share line output contacts are closed.