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UMT 1/A3SU measurement.
Electrical values for analog and serial interfaces.
| Parameter | Specification |
|---|---|
| Nominal auxiliary supply | 24 VDC |
| Auxiliary supply range | 18-30 VDC |
| Maximum power consumption | 10 W |
| CT secondary input | 5 A |
| Nominal voltage input | 66/115 VAC |
| Measuring frequency | 40.0-80.0 Hz |
| Current measuring accuracy | Class 0.5 |
| Current linear measuring range | 1.5 × rated current |
| Short-time current withstand | 10 × rated current for 1 s |
| Current input burden | Less than 0.15 VA per path |
| Operating temperature | -20 to +70 °C |
| Storage temperature | -30 to +80 °C |
| Relative humidity | 95%, non-condensing |
| Analog output channels | 3 |
| Analog output ranges | -20 to +20 mA; 0-20 mA; 4-20 mA |
| Analog output isolation | 1,500 VDC |
| PWM resolution | 12 bit |
| Current output load | 500 Ω maximum |
| Pulse output nominal gate voltage | 24 VDC |
| Pulse output maximum gate voltage | 32 VDC |
| Pulse output gate current | 10-30 mADC |
| Front protection | IP42 with professional mounting |
| Rear protection | IP21 |
| Display | Two-line, 16-character LCD |
| Communication interface | RS-485 Modbus RTU |
| Wire temperature rating | 60/75 °C copper |
Keep CT secondary circuits safely terminated during servicing. Match the voltage-input and CT ratings to this transducer configuration before applying power.
Electrical measurements can be transferred to a higher-level system through the Woodward 8444-1002 UMT 1/A3SU transducer. This configuration has 5 A current inputs and three analog output channels. True RMS voltage and current measurements form the basis for calculating active, reactive and apparent power. The instrument also handles power factor and energy quantities while presenting values on its local LCD. Configurable outputs allow selected measurements to be assigned to the analog interface or read through the serial connection. Its role is measurement and signal conversion, so transformer ratios and the chosen output assignments determine how the receiving system interprets the values.
Voltage and current measuring circuits acquire the quantities from the supervised electrical system.
The transducer calculates power and energy-related quantities from those primary measurements.
The selected measurements are scaled for the configured analog channels and made available through the serial interface.
Check the installed CT/PT arrangement and output scaling together. Servicing must keep current-transformer secondary circuits safely terminated.
Use the instrument where a receiving control or monitoring system needs converted electrical measurements from the supervised supply.
The local LCD and configuration interface provide direct access to measured values while the assigned signals are transmitted onward.
The output package connects local indication with configurable analog transmission and Modbus access. Correct scaling keeps those different representations aligned with the same electrical quantity.
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Careful product review.
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