Setra Systems L series Specifications download pdf (Page 44)

SELECTING A SCALAR

The following table is an example when selecting a data scalar for 3-phase loads based on the CT size or

maximum current. These are the minimum recommended scalar settings.

CT Size or

Max. Current

3-phase Loads

230 volts

460 volts

Scalar 1

Scalar 2

100

Scalar 2

200

Scalar 2

400

Scalar 2

600

Scalar 2

Scalar 3

1000

Scalar 3

3000

Scalar 3

Table D-2: Data Scalar Selection

EXAMPLES USING A DATA SCALAR

The following examples use kW throughout.

For example 1, the following data is used:

Volts x amps = watts 480 volts x 100 amps = 48,000 watts

Watts x 3 = system watts 48,000 watts x 3 = 144,000 watts (144kW)

Check the register’s value using the data scalar 2 value of .01:

System kW / scalar value = register value 144kW/.01 = 14,400

Since 14,400 is less than 65,535, using data scalar 2 is a good choice for this example.

For example 2, the following data is used:

480 volts x 1000 amps = 480,000 watts

480,000 watts x 3 = 1,440,000 watts (1,440kW)

Check the register’s value using the data scalar 1 value of .001:

1,440kW/.001 = 1,440,000

Since 1,440,000 is greater than 65,535, using data scalar 1 returns an incorrect result. Data scalar 1 is

not an appropriate choice.

Reviewing this example using the data scalar 3 value of .1 provides the following result:

1,440kW/.1 = 14,400

Since 14,400 is less than 65,535, using data scalar 3 is a good choice for this example.

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Setra Systems L series Specifications Page 44