Description
Key Technical Specifications
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Model Number: UAD154A (servo drive version)
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Manufacturer: ABB
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Rated Power: 1.5 kW (servo) / 100 kW (current transducer version)
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Rated Current: 3.8 A (servo) / 1000 A bidirectional (transducer)
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Supply Voltage: 380 V AC ±10 % (servo) / ±24 V DC (transducer)
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Output Signal: 3-phase PWM (servo) / 4-20 mA / 0-10 V (transducer)
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Control Interface: CANopen, EtherCAT, ±10 V analog (servo)
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Accuracy: ±0.01 % speed (servo) / 0.5 % (transducer)
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Bandwidth: DC … 100 kHz (transducer) / 5 kHz current loop (servo)
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Isolation: 4 kV AC (transducer) / 2 kV (servo)
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Operating Temperature: −25 °C … +70 °C
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Mounting: DIN-rail or panel (servo) / DIN-rail (transducer)
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Dimensions: 125 × 65 × 45 mm (transducer) / 200 × 150 × 90 mm (servo)
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Weight: 0.7 kg (transducer) / 2.1 kg (servo)
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RoHS: Compliant
ABB UAD154A
Field Application & Problem Solved
On the shop floor the biggest pain is getting a true 1000 A RMS signal into the PLC without adding another CT or shunt. UAD154A (transducer version) drops straight onto the bus-bar—no core split, no bus-work modification—and gives you a millivolt-level differential current that’s already scaled 1:2000. You’ll typically find it strapped around the main motor feed in paper mills, on the DC-link of extruder drives, or inside grid-tie inverters where you need <0.5 % accuracy for revenue metering. Its main value: it’s Hall-effect, so DC offset and high-frequency switching noise don’t saturate the core—your PLC sees a clean 0-20 mA loop proportional to 0-1000 A bidirectional.
On the shop floor the biggest pain is getting a true 1000 A RMS signal into the PLC without adding another CT or shunt. UAD154A (transducer version) drops straight onto the bus-bar—no core split, no bus-work modification—and gives you a millivolt-level differential current that’s already scaled 1:2000. You’ll typically find it strapped around the main motor feed in paper mills, on the DC-link of extruder drives, or inside grid-tie inverters where you need <0.5 % accuracy for revenue metering. Its main value: it’s Hall-effect, so DC offset and high-frequency switching noise don’t saturate the core—your PLC sees a clean 0-20 mA loop proportional to 0-1000 A bidirectional.
On the motion side, the servo version gives you 1.5 kW, 380 V AC, ±0.01 % speed accuracy, and 5 kHz current loop—perfect for robot wrists, pick-and-place, or winding lines where you need sub-micron position repeatability.
Installation & Maintenance Pitfalls (Expert Tips)
VT ratio typo kills the relay – Enter the actual VT ratio in the menu. If you leave it at 1:1 on a 4 kV bus, the relay thinks 4 kV is 110 V and you’ll never get a “sync OK.”
±24 V ripple matters – Keep ripple <200 mV p-p. High ripple introduces offset drift and you’ll chase phantom overloads.
Mounting torque – 4 N·m on the bus-bar bolts. Undertorque and you get hot-spots; over-torque and you crack the ceramic Hall insert.
Output wiring trap – Use twisted-pair shielded cable and land shield at ONE end only. Land both ends and you’ll inject VFD switching noise into the 4-20 mA loop.
Zero/span trim – Factory sets zero at 0 A, but if you run unbalanced DC links, use the trim pot to null the offset before you commission.
ABB UAD154A
Technical Deep Dive & Overview
UAD154A is a closed-loop Hall-effect transducer (current version) or a 1.5 kW servo drive (motion version). Inside the transducer: Hall sensor, compensation coil, and a small op-amp loop that forces the coil current to null the magnetic field. Result: output current is exactly proportional to primary current and independent of temperature or core non-linearity. No user firmware—just land ±24 V, read the diff current across a 100 Ω precision resistor, and you have 0-20 mA for 0-1000 A bidirectional. Lose ±24 V and the output goes open—tie it to the same UPS feeding your analog card.
UAD154A is a closed-loop Hall-effect transducer (current version) or a 1.5 kW servo drive (motion version). Inside the transducer: Hall sensor, compensation coil, and a small op-amp loop that forces the coil current to null the magnetic field. Result: output current is exactly proportional to primary current and independent of temperature or core non-linearity. No user firmware—just land ±24 V, read the diff current across a 100 Ω precision resistor, and you have 0-20 mA for 0-1000 A bidirectional. Lose ±24 V and the output goes open—tie it to the same UPS feeding your analog card.
