Key Technical Specifications
- Product model: LC1000-S/SP7
- Manufacturer: ABB
- Measurement principle: Hall effect
- Nominal primary current: 1000 A AC/DC
- Accuracy: ±0.5% full scale
- Isolation voltage: 2500 Vrms between primary and secondary
- Frequency bandwidth: DC to 20 kHz
- Secondary supply: 15 VDC to 30 VDC
- Operating temperature: -40 °C to +85 °C
- Output: Analog voltage proportional to primary current
- Mounting: PCB through-hole mounting
- Coating: Conformal coated for harsh cabinet environments
Product Introduction
ABB LC1000-S/SP7 is a PCB-installed hall-effect current transducer. It measures high AC or DC current inside variable speed drives and power conversion assemblies.
This coated sensor isolates high primary current from low-voltage control circuits. Its 20 kHz bandwidth captures fast transient current spikes common in inverter switching, with total error kept below 0.5% of full scale under rated temperature conditions. (The black toroidal core sits directly on the main PCB assembly.)
Installation & Configuration Guide
Preparation (10 min) Power down the drive, lock out/tag out. Measure secondary supply to confirm 15–30 VDC before handling. Gather ESD wrist strap, torque screwdriver, and pinout drawing. Inspect connector pin alignment.
Removal (5–10 min) Take photos of wiring before desoldering. Desolder secondary signal and power pins from the host PCB. Lift the toroidal transducer assembly straight up. Avoid twisting the core.
Installation (10 min) Place new transducer onto PCB pads. Solder secondary pins with low-temperature solder. Do not apply excessive heat to the hall chip. Route primary conductor through the toroid center only.
Power-On & Test (10 min) Restore 24 VDC secondary supply. Confirm LED status (red for power present). Inject known reference current through primary. Verify analog output reading matches expected value. Perform short insulation check before full power energization.
Troubleshooting Quick Reference
| Symptom | Likely Cause | Verification Action |
|---|---|---|
| No analog output, power LED off | Missing secondary supply | Measure pin voltage; confirm 15–30 VDC |
| Reading offset, zero point drift | Thermal drift or damaged hall element | Let unit warm 15 minutes, recheck zero offset |
| Output noisy, unstable | Primary conductor not centered in toroid | Re-center cable; separate low-voltage signal wires |
| Large measurement error | Overcurrent saturation | Reduce primary current below 1000 A nominal |
| Intermittent signal | Cold solder joint on secondary pins | Inspect solder pads under magnifier |
Dimensions, Mounting & Wiring Notes
- H×W×D: 82 mm × 82 mm × 32 mm
- Mounting: Through-hole soldering to host power PCB
- Terminal notes: Secondary signal pins are sensitive to ESD. Keep signal wiring twisted and short. Do not run secondary wiring parallel with high-current primary cables. Primary conductor must pass through toroid center hole. Multiple conductors in opposite directions cancel magnetic flux.
FAQ
Q: Is ABB LC1000-S/SP7 still manufactured new by ABB? A: No, OEM production has ended. Available stock consists of refurbished, fully tested units. Verify with OEM datasheet for your drive model compatibility.
Q: What minimum secondary supply margin should I reserve? A: Maintain at least 20% voltage margin. If your supply is nominally 24 VDC, keep operating range above 19.2 VDC.
Q: I’m replacing this transducer inside a large variable frequency drive. Can I swap it hot? A: No. Primary circuit carries high energy. You must lock out and test for zero energy before removal. Hot swap risks arcing and sensor destruction.
Q: What damage signs should I check before buying a used LC1000-S/SP7? A: Look for cracks in the toroid coating, burnt PCB traces, or discoloration near the hall chip. Any burn smell from the assembly indicates internal damage.
Q: Will LC1000-S/SP7 work if I pass two opposite-direction primary cables through the core? A: No. Magnetic fields cancel, and output will read near zero. Only one primary conductor passes through the aperture.
Q: Can I use this transducer outdoors without extra enclosure? A: No. The conformal coating protects from condensation inside cabinets. It does not meet outdoor weather exposure ratings.
Q: What happens if I exceed 1000 A primary continuously? A: The sensor saturates, output stops tracking current. Permanent hall element drift may occur after sustained overload.
