Woodward GCP-20 Series User Manual

Manual 37128A GCP-20 Series - Genset Control
Page 76/190 © Woodward
Mains Current/Mains Power Measurement
The two following chapters Mains Power Measurement Via CT and Mains Power Measurement Via Analog In-
put (Option In20) are displayed alternatively and according to the measurement. If no measurement of the mains
power was requested via a 0/4 to 20 mA analog input, the measurement is always effected via a power trans-
former.
Mains Power Measurement Via CT
Parameter 19
Current transf.
Mains 0000/x
Mains CTs 10 to 7,000/{X} A
The input of the CT ratio is necessary in order to display and control the actual val-
ues. The CT ratio must be selected so that, at maximum power, at least 60 % of the
CT nominal current flows. A lower percentage may lead to malfunctions. Addi-
tional inaccuracies in the control and monitoring functions also occur.
{x} = 1 A.......Secondary current = 1 A at primary rated current = {X} A;
{x} = 5 A.......Secondary rated current = 5 A at primary rated current = {X} A;
{X}................e.g. from the main series 10, 15, 20, 30, 50 or 75 A and the decimal
fractions and multiples of these or the corresponding secondary se-
ries with 25, 40 or 60 A.
Mains Power Measurement Via Analog Input (Option In20)
Parameter 20
Analog in Pmains
0-00mA
Analog input P mains: Range 0 to 20 mA / 4 to 20 mA
The measuring range 0 to 20 mA or 4 to 20 mA is selected with this parameter. If
the range selected is 4 to 20 mA and the current is lower than 2 mA, a broken wire
alarm is issued.
NOTE
For an import/export real power control application, ensure that the set point value selected is in the
middle of the measuring range. This will allow the controller dynamic to be used to its fullest capacity.
Parameter 21
Analog in Pmains
0% 0000kW
Mains real power 0/4 mA [1] -9,990 to 9,990 kW; [4] -6,900 to 6,900 kW
The scaleable analog input is assigned a numerical value, which corresponds to the
lowest input value Æ (0 % corresponds to -500 kW; 0 or 4 mA).
Parameter 22
Analog in Pmains
100% 0000kW
Mains real power 20 mA [1] -9,990 to 9,990 kW; [4] -6,900 to 6,900 kW
The scaleable analog input is assigned a numerical value, which corresponds to the
highest input value Æ (100 % corresponds to 500 kW; 20 mA).

Woodward GCP-20 Series Specifications

General

Brand	Woodward
Model	GCP-20 Series
Category	Control Unit
Language	English