NK Technologies' externally powered APT Series Power Transducers are now available with 24VAC/DC, 120VAC or 240VAC power supply options to support a wider range of applications. These transducers produce an industry standard 4-20 mA, 0-5 VDC or 0-10 VDC output that can help users monitor and report power usage, enabling them to take proactive corrective action when power rises to abnormal levels or falls to unexpected levels.
The APT power transducer can be configured to accept 5 amp secondary current transformers, or NK Technologies' ProteCT low voltage output sensors. Either type of current sensing will produce an accurate output signal to help identify areas of excessive energy consumption and allow intervention to reduce demand.
"There are many applications for the APT Power Transducers including plant energy management, conveyors and pump monitoring," says Philip Gregory, President, NK Technologies. "It's used to measure the power usage of a single piece of equipment, an area of a plant, or the entire facility. It can detect conveyor jams and overloads, and detect if a drive belt breaks."
The APT can also detect dry run from clogged pump intake or discharge lines and monitor impeller cavitation and bearing wear. They are housed in a compact DIN mounted case with a low profile that reduces the need for large cabinet depth requirements. Their finger safe terminals are clearly labeled for quick installation.
The VTU Voltage Transducer allows you to measure DC or AC circuit voltages to1200 volts with one sensor. This sensor produces an analog signal directly proportional to the RMS voltage making it a very valuable tool to spot issues with power generation (conventional and alternative sources) like brown outs and phase loss. The voltage will be present on the line side of a disconnect even when the breaker or switch is open.
- Industry standard outputs of 4-20mA, 0-5 and 0-10 VDC that are proportional to RMS voltage and compatible with most automation and control systems.
- 24 VAC or DC with low power consumption.
- Primary circuit uses self-tightening terminals and the power supply and output terminals are finger-safe.
- Panel or DIN rail mounting options.
- Safely measure the combined output from connected photovoltaic panels.
- Measure the AC voltage to pumps and aerators in water delivery and treatment systems so they can be shut down if the supplied voltage falls to a dangerous level.
- Monitor the voltage of field windings in DC motors of cranes and other heavy lifting equipment to keep the motor speed under control.
The AT/ATR-FD series current transducers feature an aperture with a 1.31" inside diameter to accomodate wire sizes for loads up to 400 amps. The design makes feeding the wires through the aperture as effortless as possible, ensuring an easy installation even in applications where there are multiple conductors per phase. The overall size of the sensor is not much larger than that of a standard sensor case and can be mounted on a back panel or a DIN rail.
- 4-20mA analog signal proportional to AC current.
- Available in both average responding and True RMS models.
- Simple and reliable 2-wire loop powered connection.
- Choice of three ranges: 0-200, 300 or 400 amps.
- Aperture provides ample space for a bus bar, a single or multiple conductors.
- Factory calibrated with 5-year warranty.
- DIN rail or panel mount.
- Monitor Large Machines: Detect over or under-current conditions before they cause breakdowns or interlock one process with another.
- Water Delivery and Treatment: Detect open discharge lines; sense clogged filters or blocked intake to pumps; and measure increased current to show failing bearings or pump impeller cavitation.
- Generators: Shed noncritical loads when demand reaches a set level.
In response to customers' requests, NK Technologies has added a series of 1 A output models to its large aperture current transformers. The CT-MS and CT-LS Series have a split-core design and a larger than average sensing window that is ideal for installing over large wires or bus bars. Previously available only with a 5 amp output, the addition of the 1 amp output models allows our customers to use these easy-to-install CTs with their power monitors, panel meters, or data acquisition devices that are designed for 1 amp.
A current transformer (CT) should never be energized (AC current through the sensing window) without a load connected to the output terminals. Best practice is to terminate the current transformer secondary on a terminal block with the ability to short between two points before extending the leads to the load. If it is ever necessary to remove the load from the CT while it is or could become energized, a shorting bar can be placed between the secondary loads, as shown in the drawing to the right. This will allow the load to be removed safely.
- Compatible with standard power monitors and panel meters designed for 1 A or 5A input.
- Larger sensing windows:
- MS Series aperture measures 2.22" x 1.19" and measures current from 0-150 to 0-800 A.
- LS Series aperture measures 3.49" x 2.36" and measures current from 0-800 to 0-1600 A.
- Plated terminals for reliability.
- UR recognized file E475131. Meets ANSI/IEEE C57.13 and IEEE C57.13.2.
- Serves as current input for use with power transducers.
- Saves space in control panels by remotely locating the sensing of the current closer to the load.
AGLD Ground Fault Sensors with Large LED Display for Clear Viewing of Trip Point in Any Light Condition
AGLD series ground fault sensors keep machinery and their operators safe from accidental shocks. The large, one piece solid- core design allows for installation over wires feeding heavy loads. The output relay will change state at any point between 5 and 100mA, or 80 and 950mA. A delay can be set to allow down stream protection to activate before this sensor, keeping the main circuit protection hot and the equipment energized while the smaller faults are cleared. The large LED display shows the precise trip point and the extra delay clearly, in any light condition. The display flashes when there is current sensed over the trip point.
- Electromechanical relay output provides both normally open and normally closed contacts and is compatible with most automation and control systems.
- Externally powered with a choice of fail safe or standard operation.
- A single turn potentiometer with the setpoint shown on the display makes adjusting the setpoint in the field easy.
- Large solid-core case with a large sensing window provides ample space for multiple conductors.
- Simple DIN rail mount for quick installation.
- Monitor Large Machines: Detect fault currents before damage can occur. Connect the output to a shunt trip breaker operating solenoid or to the circuit powering a connector coil.
- Water Delivery and Treatment: Detect moisture ingress in submersible pumps.
- Heating Processes: If an element shorts to ground, the sensor will activate to de-energize the circuit, keeping safety at the forefront.
Quickly & Easily Convert any Standard Sensor Output to Modbus Format with New ADC Signal Converters from NK Technologies
NK Technologies introduces ADC Series Analog to Digital Signal Converters. The ADC series readily accepts analog signals from up to eight loop or separately powered current, voltage, temperature or any other parameter sensor, and seamlessly converts them to a digital signal output that interfaces with the industry standard Modbus RTU digital protocol using a single network address. DIN rail mounting speeds installation. Sensor loop power supplied by the converter can eliminate the needs for a separate DC power supply. The ADC series can be factory-set for 120 or 240 VAC power supplies.
"With finger-safe field wiring terminals that are clearly marked for field installation, quick DIN rail mounting and the ability to connect up to eight 4-20 mA analog sensors to produce a digital signal representing 0-100% of each sensor output, the ADC makes it easier than ever to convert analog signals to an industrystandard Modbus output," says Philip Gregory, President, NK Technologies.
The ADC series is ideal for photovoltaic power production due to its ability to measure output current accurately using an appropriately sized sensor, and its ability to measure voltage output from any sensor with a 4-20 mA output. In machine control applications the ADC series combines several analog signals into a single Modbus address, providing users with web-based access to data. The ADC series can also significantly enhance SCADA systems by enabling existing sensor data to be reported and recorded via network communication.
ASXP-MS Current Operated Relay - One Piece, Split-Core Design Makes Installation a Snap! Snap onto DIN Rail, Snap Over Conductors.
The ASXP-MS combines a current transformer and a signal conditioner in one package. The large, easy-to-install, split-core design allows for installation over existing conductors without the need to disconnect the load, even in applications where there are multiple conductors per phase. For new installations, just remove the top portion of the sensing ring, place the conductors inside, and snap the top back in place.
The switch output is powered from the primary circuit, and the setpoint is adjustable between a very wide range. The solid-state contact provides a trouble free, long lasting and very durable alarm or interlock, improving safety and overall system reliability.
- Electromechanical relay output provides both normally open and normally closed contacts.
- Single turn potentiometer shows setpoint on the label for simple field setpoint adjustment.
- Adjustable start delay to bypass inrush current.
- Sensing window provides ample space for bus bar, single or multiple conductors.
- Simple DIN rail or panel mount.
- Designed for UL, CUL and CE approval.
- Monitor Large Machines: Detect over or under-current conditions before they cause break downs, or interlock one process with another.
- Water Delivery and Treatment: Detect open discharge lines; sense clogged filters or blocked intake to pumps.
- Generators: Shed noncritical loads when demand reaches a set level.
Benefit from Cost-Effective Motor Monitoring and Over-Load Protection with ASXP Current Sensing Switch from NK Technologies
NK Technologies' ASXP Current Sensing Switch is now available with a user adjustable setpoint from 1-80A. ASXP Series Current Operated Switches are powered versions of the company's popular current switches with integral time delay. For use with 24VAC/DC or 120VAC supplies, these switches deliver OEM-caliber accuracy, precision tolerances, low hysteresis and an operation range between 40 and 100 hertz - functionality ideal for monitoring single and three-phase motors. They come standard with a robust solid-core enclosure and LED indicators for trip point contact status.
"The compact ASXP is a highly versatile option for single and three-phase motor monitoring, with a relay output that allows the sensor to be used to control NEMA size 1 contactor coils and other inductive loads," says Philip Gregory, President, NK Technologies. "What's more, a fixed two-second delay trip timer eliminates nuisance alarms due to start-up inrush or temporary over-current conditions in motor or heater status applications, eliminating the need for a separate time delay relay. After startup a second 0-20 second delay can be set to meet the needs of specific application requirements."
In motor protection applications these sensors provide electronic proof-of-operation and detect current draw changes in the motor caused by pumps running dry or impending bearing failure. The ASXP is less expensive to install and serves as a non-intrusive alternative to differential pressure flow sensors or thermal switches. They also deliver quicker response times than Class 10 overload relays. Users will also benefit from repeatable performance, constant hysteresis and linear response.
The Control Panel (Keypad) is mounted on the enclosure covers of all NEMA 1 and NEMA 12 ACS550-Px packages. Easy to program, and providing continuous display of three selectable parameters (in one of 14 available languages), the keypad makes parameter upload/download/storage/transfer easy. Download and transfer of drive parameters is easy, too. Store parameters for a specific drive/application in the control panel and quickly
The High Endurance Capacitors are intended for use in electrical environments that are rich in harmonic content due to non-linear loads. Some applications include factories and plants with a large numbers of variable frequency drives and/or DC drives, waste water treatment plants, pumping stations, facilities that co-generate power, and power consumers that are incurring penalties for poor power factor.