500-DOB930 A-B Control Unit
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IN STOCK500-DOB930 A-B Control Unit
Voltage Sensing Circuits that are rated up to 690V AC line-to-line can be connected directly. Higher voltages require potential transformers (PTs), also known as voltage transformers (VTs), to step the voltage down. Wiring must conform to all applicable codes and standards. In particular, you provide suitable overcurrent protection, with current and interrupting ratings that are selected to help protect the wiring. Pay particular attention to correct phasing and polarity of voltage connections. The diagrams use the ‘dot’ convention to indicate transformer polarity. The dot indicates the H1 and X1 terminals on the high side and low side of the transformer respectively. When wiring a PowerMonitor 5000 unit to existing PTs and metering devices, connect the voltage sensing terminals of the PowerMonitor 5000 unit in parallel with the voltage sensing terminals of the existing metering devices. The following wiring diagrams indicate typical voltage sensing connections to various types of power systems.
Use a shorting terminal block (included in the 1400-PM-ACC accessory kit), test block, or shorting switch (you provide) for CT wiring to permit safely servicing connected equipment such as the PowerMonitor 5000 unit without de-energizing the power system. Use 2.5 mm2 (14 AWG) or 3.3 mm2 (12 AWG) (maximum) wiring between the PowerMonitor 5000 unit and the shorting block. Use 2.5 mm2 (14 AWG) or larger wire between the shorting block and the CTs, depending on the length of the circuit. Longer circuits require larger wire so that the wiring burden does not exceed the CT burden rating and reduce system accuracy. The diameter of the current sensing wiring openings is 7 mm (0.28 in.).
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