DSE Model 7000 Series Control & Instrumentation System Operators Manual
Part No. 057-074 7000 Series OPERATING MANUAL ISSUE 2 02/05/2008 ADM
9
3.3 GENERATOR AND MAINS VOLTAGE / FREQUENCY SENSING
Measurement type True RMS conversion
Sample Rate 5KHz or better
Harmonics Up to 10
or better
Input Impedance
300K Ω ph-N
Phase to Neutral 15V to 333V AC (max)
Phase to Phase 25V to 576V AC (max)
Common mode offset
from Earth
100V AC (max)
Resolution 1V AC phase to neutral
2V AC phase to phase
Accuracy ±1% of full scale phase to neutral
±2% of full scale phase to phase
Minimum frequency 3.5Hz
Maximum frequency 75.0Hz
Frequency resolution 0.1Hz
Frequency accuracy ±0.2Hz
3.4 GENERATOR 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
Maximum continuous
current
5A
Overload Measurement 3 x Nominal Range 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)
3.5 INPUTS
3.5.1 DIGITAL INPUTS
Number
DSE72x0 6
DSE73x0 8
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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