Specification
Page 11 of 100
057-230 ISSUE: 1
2.6 VOLTAGE & FREQUENCY SENSING
Measurement Type
True RMS conversion
Sample Rate
5 kHz or better
Harmonics
Up to 11
th
or better
Input Impedance
300 k
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
th
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
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)
