Look at picture of panel-mounted unit.
The SENTINEL Wattmeter RTU accurately measures and computes the power characteristics of 3-phase distribution systems. The unit's analog inputs connect directly to the secondaries of potential (PTs) and current (CTs) transformers, and are rapidly sampled (digitized) to derive true RMS and Watt values. This approach bypasses transducers thereby eliminating their associated calibration and inaccuracy problems.
Six cycles of input sample values are managed until a preset status point (trigger) is activated, or upon demand from a host computer. For example, this event history will provide a high resolution snapshot of the line conditions that caused a feeder breaker to trip. Fourier transforms may be performed on this waveform data to identify line harmonics. The unit also features a set of status inputs and digital outputs for controlling associated devices.
Two ports are available for dedicated communications to a host RTU, a Master Station, and/or dial-up computer. The wattmeter's data can also be accessed on-site with a handheld tester or portable personal computer.
Input/Output: 3AI (120V or 240V PTs) 4AI (5A CTs) 8DI 6DO
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APPLICATIONS
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FEATURES
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SPECIFICATIONS
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Operating environment (electronics)
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Operating power
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Three PT inputs
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Four CT inputs (neutral current optional)
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Analog to digital conversion
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Derived measurements
Instantaneous values (for each phase) below presented upon interrogation:
Aggregate values below are presented upon interrogation (and reset upon successful read):
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Eight status inputs (isolated)
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Six primary control outputs
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Dual communication ports
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ADDITIONAL INFORMATION
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Look at picture of panel-mounted unit.
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ORDERING INFORMATION
200084: SENTINEL RTU CARD
200084-001 $1925
Specify communications protocol and/or firmware version when ordering.
PT/CT TERMINATION ASSEMBLY. Barrier strip with precision, low-burden, shunt resistors for conditioning the AC input signal for the logic board.
200125-001 $92
Contact representative for selection of proper "line-post sensors."
OPTIONAL LINE DRIVER CHIPS. These components replace the standard RS-232 line driver I.C. (socketed DIP).
200127-001, RS-485 $24
200127-002, RS-422 $24