Basler Electric DGC-2020HD - Manual (Page 273)

9469300990 Rev B 263
generator, bus 1, and optional bus 2 can be configured here. Figure 169 illustrates the floating Rated
Data screen. Settings are listed in Table 77.
Sensing Transformer Ratings
Generator
Generator PT settings establish the nominal primary (generator side) and secondary (DGC-2020HD side)
voltage levels at the generator voltage-sensing transformer.
Generator CT settings establish the nominal, primary (generator side) current level at the generator
current sensing transformer. The secondary value of the generator CT is dictated by the style number of
the controller. A DGC-2020HD with a style number of 1xxxxxxxx uses a nominal CT secondary rating of 1
Aac. A DGC-2020HD with a style number of 5xxxxxxxx uses a nominal CT secondary rating of 5 Aac.
Gen CT Low-line Scale Factor is used to automatically adjust the Gen CT Primary Amps setting in
applications that may utilize more than one type of genset connection. The scale factor setting is
implemented when the DGC-2020HD senses a contact closure at a contact input programmed to activate
scaling of the settings. Scale factor serves as a multiplier for the Gen CT Primary Amps setting. For
example, if a scale factor contact input is received by the DGC-2020HD and the scale factor setting is
2.000, the Gen CT Primary Amps setting is doubled (2.000 x Gen CT Primary Amps).
Bus 1 and Bus 2
Primary and secondary bus transformer ratings are used by the optional automatic transfer switch
function. This function monitors a three-phase bus input to detect mains failure. The primary setting
establishes the nominal voltage present at phases A, B, and, C of the bus. The secondary setting
establishes the nominal voltage detected at the bus voltage input of the DGC-2020HD.
Bus CT settings establish the nominal, primary (bus side) current level at the bus current sensing
transformer. The secondary value of the bus CT is dictated by the style number of the controller. A DGC-
2020HD with a style number of 1xxxxxxxx uses a nominal CT secondary rating of 1 Aac. A DGC-2020HD
with a style number of 5xxxxxxxx uses a nominal CT secondary rating of 5 Aac.
Voltage Ratings
Rated Volts accepts a value from 1 to 500,000, in increments of 1 volt.
Rated Secondary Volts is calculated using the following equation:






=
Volts Primary PT Gen
Volts Secondary PT Gen
Volts Rated Volts Secondary Rated
Equation 4. Rated Secondary Volts
Current Ratings
Rated Phase Amps is calculated using the following equations:
3 Volts L L Rated
kVA Rated
machine) phase (3 Amps Phase Rated
−
= −
Equation 5. Rated Phase Amps for Three-Phase Connections
Volts L L Rated
kVA Rated
machine) phase (1 Amps Phase Rated
−
= −
Equation 6. Rated Phase Amps for Single-Phase Connections
Rated Secondary Phase Amps is calculated using the following equation:
DGC-2020HD Configuration