Phoenix Contact SCK-M-I-4S-20A Handleiding (128 Pagina's)

Handleiding

SOLARCHECK string current measurement with SCK-M-I-…

105608_en_02 PHOENIX CONTACT 19

Value ranges

Reverse currents of up to -1 A can be measured. Positive and negative current values are

stored in a signed register. The values can be interpreted and a corresponding alarm func-

tion can be activated via a higher-level controller.

Values outside the measuring range from -1 A to +20 A are not accurate enough. Values

outside the overcurrent range from -1.5 A to +25 A are removed from the register.

Figure 3-3 Valid value range for current measurement

Measuring accuracy

Current measurement has an accuracy of ±1%. This value is based on the measuring range final

value (20 A) and is valid for the entire measuring range from -1 A to +20 A. Furthermore, a tem-

perature coefficient TC

20

is applied to the measurement. This is ±0.02%/Kelvin. The deviation

occurs above and below the production-related compensation temperature of 20°C.

Example:

Ambient temperature: 30°C

Compensation temperature: 20°C

Deviation of measurement ±1% + (±0.02% x (T

Ambient

– T

Compensation

))

Deviation at T

30°C

= ±1.2% of measuring range final value (±1.2% of 20 A = ±240 mA)

I

String‘

I

String

0 A-1,5 A -1 A 1 A 25 A

20 A

100 A

25 A

20 A

-1 A

-1,5 A

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