Basler Electric DGC-2020 - Manual (Page 141)

Genset Electrical Parameters
Genset electrical parameters used by the DGC-2020 include the genset connection type, power rating,
and voltage rating.
Genset connection types A accommodated by the DGC-2020 include three, three-phase configurations
(delta, wye, and four-wire delta) and two single-phase configurations (sensing across phases A and B or
A and C).
Bus sensing connection B types include Single-Phase and Three-Phase (hardware version 3 only).
The Phase Rotation C setting allows selection of ABC or CBA rotation according to the phase rotation
connection of the machine. The DGC-2020 calculates the power angle as the angle between the Phase
AB voltage and phase B current, then applies an angle compensation factor determined by the phase
rotation setting. If the actual phase rotation connection of the machine does not match the phase rotation
setting, calculation of the power angle will be incorrect, which could result in a miscalculation of kW, kvar,
and Power Factor.
The DGC-2020 is compatible with gensets having power ratings D up to 9,999 kW and voltage ratings E up
to 99,999 Vac.
The System Type setting F is used with dead bus breaker close arbitration. For more information, refer to
Section 3, Functional Description, Dead Bus Breaker Close Arbitration.
The Alternate Frequency setting G defines the rated machine speed for the speed trim function when the
alternate frequency override logic element is true. The DGC-2020 recalculates the speed trim setpoint as:
𝐴𝑙𝑡𝑒𝑟𝑛𝑎𝑡𝑒 𝑆𝑝𝑒𝑒𝑑 𝑇𝑟𝑖𝑚 𝑆𝑒𝑡𝑝𝑜𝑖𝑛𝑡 = 𝑆𝑝𝑒𝑒𝑑 𝑇𝑟𝑖𝑚 𝑆𝑒𝑡𝑝𝑜𝑖𝑛𝑡 × �
𝐴𝑙𝑡𝑒𝑟𝑛𝑎𝑡𝑒 𝐹𝑟𝑒𝑞𝑢𝑒𝑛𝑐𝑦 𝑆𝑒𝑡𝑡𝑖𝑛𝑔
𝑅𝑎𝑡𝑒𝑑 𝐹𝑟𝑒𝑞𝑢𝑒𝑛𝑐𝑦 𝑆𝑒𝑡𝑡𝑖𝑛𝑔
�
For example, a machine has a rated frequency of 60 Hz, the speed trim setpoint is set for 59.5 Hz, and
the alternate frequency is set for 50 Hz. When the alternate frequency override logic element is true, the
DGC-2020 calculates the alternate speed trim setpoint to be 59.5 X (50/60) = 49.58 Hz.
The 32 protection function uses the Genset KW Rating when determining pickup. The 40Q protection
function uses the Rated kvar (which is calculated from the Genset KW Rating) and the Rated Power
Factor setting
H when determining pickup.
Engine Speed Measurement
The DGC-2020 can be configured to detect engine speed I from a magnetic pickup (MPU), the genset
frequency, or both the MPU and genset frequency. On engines with CANBus ECUs, if MPU or MPU Freq
is selected as the Speed Signal Source, the DGC-2020 uses CANBus as the speed source when
CANBus is enabled. If Gen Freq is set as the Speed Signal Source, the DGC-2020 uses the generator
frequency.
When engine speed is obtained from the genset frequency, the DGC-2020 uses the rated (nominal)
genset frequency
J and nominal rpm rating K when calculating engine rpm.
When engine speed is obtained from an MPU, the DGC-2020 uses the nominal rpm rating I and the
number of flywheel teeth L when calculating engine rpm.
The speed signal from the MPU takes priority when both the genset frequency and MPU are selected as
the engine speed source. If both MPU and genset frequency are selected and the MPU fails, the DGC-
2020 will automatically switch to the genset frequency as the engine speed source.
When the CANBus interface is used, the speed signal source settings must be set at MPU or MPU_Gen.
This allows the DGC-2020 to receive the engine speed data sent by the ECU via the SAE J1939 protocol.
EPS Threshold
Indication that the emergency power system is supplying load is determined by a user-adjustable
threshold setting
M expressed as a percentage of the genset CT (nominal) primary rating.
The Low Line Scale Factor setting N is used to automatically adjust the EPS threshold setting in
applications that might utilize more than one type of genset connection. The scale factor setting is
implemented when the DGC-2020 senses a contact closure at a contact input programmed to activate
scaling of the settings. The value of the scale factor setting serves as a multiplier for the threshold setting.
For example, if a scale factor contact input is received by the DGC-2020 and the scale factor setting is
2.000, the threshold setting will be doubled (2.000 x Threshold setting).
9400200990 Rev X DGC-2020 BESTCOMSPlus
® Software
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