
Specifications
Part No. 057-120 8660 OPERATING MANUAL ISSUE 1 07/05/2010 ADM
11
3.5 MAINS AND LOAD CURRENT SENSING
Measurement type True RMS conversion
Sample Rate 5KHz or better
Harmonics Up to 10
or better
Nominal CT secondary rating 1A or 5A (5A recommended)
Maximum continuous current 5A
Overload Measurement 3 x Nominal CT setting
Absolute maximum overload 50A for 1 second
Burden 0.5VA (0.02Ω current shunts)
common mode offset ±2V peak plant ground to CT common terminal
Resolution 0.5% of 5A
Accuracy ±1% of Nominal (1A or 5A) (excluding CT error)
3.6 INPUTS
3.6.1 DIGITAL INPUTS
Number 11
Arrangement Contact between terminal and ground
Low level threshold 2.1V minimum
High level threshold 6.6V maximum
Maximum input voltage +50V DC with respect to plant supply negative
Minimum input voltage -24V DC with respect to plant supply negative
Contact wetting current 7mA typical
Open circuit voltage 12V typical
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