Specification
057-236 ISSUE: 1 Page 10 of 94
2.6 VOLTAGE & FREQUENCY SENSING
Measurement Type True RMS conversion
Sample Rate 5 kHz or better
Harmonics Up to 11
or better
Input Impedance
300 kΩ phase to neutral
Phase To Neutral
15 V
(minimum required for sensing frequency
)
to 415 V AC
(absolute maximum)
Suitable for 345 V AC nominal
(±20 % for under/overvoltage detection)
Phase To Phase
25 V
(minimum required for sensing frequency
)
to 720 V AC
(absolute maximum)
Suitable for 600 V AC nominal
(±20 % for under/overvoltage detection)
Common Mode Offset From Earth 100 V AC (max)
Resolution
1 V AC phase to neutral
2 V AC phase to phase
Accuracy
±1 % of full scale phase to neutral
±2 % of full scale phase to phase
Minimum Frequency 3.5 Hz
Maximum Frequency 75.0 Hz
Frequency Resolution 0.1 Hz
Frequency Accuracy ±0.2 Hz
2.7 CURRENT SENSING
Measurement Type True RMS conversion
Sample Rate 5 KHz or better
Harmonics Up to 10
or better
Nominal CT Secondary Rating 5 A
Maximum Continuous Current 5 A
Overload Measurement 3 x Nominal Range setting
Absolute Maximum Overload 50 A for 1 second
Burden
0.25 VA (0.01 Ω current shunts)
Common Mode Offset ±1 V peak plant ground to CT common terminal
Resolution 0.5 % of 5 A
Accuracy ±1 % of Nominal (5 A) (excluding CT error)
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