LEM LF1005-S/SP36 Current Transducer

Product Details

LF1005-S/SP36 Product Description

The LEM LF 1005-S/SP36 is a closed-loop Hall-effect current transducer engineered for seamless integration into multi-layer industrial control architectures. Rated for a nominal primary current of 1005 A with a ±SP36 secondary output configuration, this transducer delivers high-accuracy, galvanically isolated current measurement across demanding automation environments including power generation, petrochemical processing, water treatment, mining, and marine propulsion systems. Its compact DIN-rail-compatible form factor and standardized signal output make it a precision-grade component for both new installations and retrofit control cabinet upgrades.

Unlike standalone measurement devices, the LF 1005-S/SP36 is designed to function as a coherent node within a complete automation platform. Its signal output integrates directly with analog input modules on PLCs such as the Siemens S7-300, S7-400, and S7-1500 series, as well as Allen-Bradley ControlLogix and CompactLogix platforms. When paired with a 24 VDC power supply module—such as the Siemens SITOP PSU100S or Phoenix Contact QUINT-PS series—the transducer maintains stable excitation voltage across the full operating temperature range, ensuring measurement integrity even under variable load conditions in industrial switchgear panels.

In a fully integrated automation platform, the LF 1005-S/SP36 occupies the I/O sensing layer, feeding real-time current data upward through the signal chain to the control layer and ultimately to the SCADA or DCS supervisory layer. This layered architecture depends on signal fidelity at every node, and the LF 1005-S/SP36's closed-loop topology ensures that secondary output remains proportional to primary current with minimal phase shift—critical for power quality monitoring and motor protection relay coordination.

At the control layer, the transducer's analog output interfaces with AI modules on platforms such as the Siemens ET 200SP distributed I/O system or the Beckhoff EL3064 analog input terminal. For installations requiring Modbus RTU or PROFIBUS DP communication, a signal conditioning module—such as the Phoenix Contact MCR-SL-I-I or Wago 750-459 analog input module—converts the transducer's voltage output into a protocol-compatible data stream readable by the PLC's communication processor.

Power layer stability is maintained through dedicated 24 VDC rail segments, often sourced from Siemens SITOP PSU8600 modular power supplies or ABB CP-E 24/10.0 units, which provide the regulated ±15 V excitation required by the LF 1005-S/SP36. In redundant architectures, dual power feeds with automatic switchover—managed by a Phoenix Contact Redundancy Module—ensure uninterrupted transducer operation during primary supply faults.

At the HMI and visualization layer, current values captured by the LF 1005-S/SP36 are displayed on operator panels such as the Siemens SIMATIC HMI TP1200 Comfort or Weintek MT8103iE, enabling real-time load monitoring and alarm management. In drive-intensive applications, the transducer's output feeds into the feedback loop of ABB ACS880 or Siemens SINAMICS G120 variable frequency drives, supporting closed-loop torque and speed regulation for large motors in compressor stations, pump houses, and conveyor systems.

For protection layer integration, the LF 1005-S/SP36 works in conjunction with Schneider Electric Sepam 80 or ABB REF615 feeder protection relays, providing the primary current signal required for overcurrent, earth fault, and differential protection functions. This makes the transducer a foundational component in medium-voltage switchgear panels and motor control centers (MCCs) where protection coordination is mandatory.

Power Generation & Utilities: In thermal, hydro, and wind power plants, the LF 1005-S/SP36 monitors generator stator currents and transformer primary windings. Its high isolation voltage (3 kV RMS) and wide primary current range make it suitable for 6 kV and 10 kV bus monitoring applications where galvanic separation between the high-voltage primary and the low-voltage control circuit is mandatory for personnel safety and equipment protection.

Petrochemical & Oil and Gas: Compressor motor drives and pump control panels in ATEX-classified zones require current transducers with stable performance across wide ambient temperature ranges. The LF 1005-S/SP36's -25°C to +70°C operating range and closed-loop accuracy support continuous process monitoring in offshore platforms, LNG terminals, and refinery motor control centers, where unplanned downtime carries significant operational cost.

Water Treatment & Municipal Infrastructure: Variable-speed pump drives in water treatment plants rely on accurate current feedback for energy optimization and predictive maintenance. The LF 1005-S/SP36 integrates with SCADA systems via analog I/O modules, enabling operators to track motor loading trends, detect bearing wear through current signature analysis, and schedule maintenance before failure occurs.

Mining & Metallurgy: Conveyor belt drives, ball mill motors, and hoisting equipment in underground and open-pit mining operations demand robust current sensing under high vibration and dust ingress conditions. The LF 1005-S/SP36's sealed construction and wide current range support monitoring of large induction motors (up to 1500 A primary), providing the data needed for load balancing and overload protection in multi-drive systems.

Marine Propulsion & Shipboard Power: Integrated bridge systems and electric propulsion architectures on vessels require current transducers that maintain accuracy across the full load range of propulsion motors. The LF 1005-S/SP36's linearity and low offset current support precise power management in DC bus architectures and shaft generator systems, contributing to fuel efficiency and compliance with IMO energy efficiency regulations.

Q1: Is the LEM LF 1005-S/SP36 compatible with both Siemens S7 and Allen-Bradley ControlLogix analog input modules? Yes. The LF 1005-S/SP36 produces a voltage output (±SP36 configuration) that is compatible with standard ±10 V analog input channels found on Siemens SM 331 / ET 200SP AI modules and Allen-Bradley 1756-IF16 / 1769-IF4 analog input cards. Signal conditioning may be required to match the exact voltage range and impedance of the target AI module. Always verify the input impedance specification of the PLC analog module against the transducer's output drive capability before installation.

Q2: How does the LF 1005-S/SP36 support redundant control architectures and long-term maintenance efficiency? The closed-loop Hall-effect design of the LF 1005-S/SP36 provides inherent self-compensation for temperature drift and magnetic offset, reducing the need for periodic field calibration. In redundant architectures, two transducers can be installed on the same primary conductor bus bar, with outputs fed to separate AI channels on redundant PLC CPUs. This configuration supports hot-standby control with automatic switchover, ensuring continuous current monitoring without process interruption. The transducer's modular mounting design also allows in-service replacement without de-energizing the primary conductor in appropriately designed switchgear panels.

Q3: What is the warranty coverage and pre-shipment testing standard for the LEM LF 1005-S/SP36? Every LEM LF 1005-S/SP36 unit supplied by NANKMOS is covered by a 12-Month Warranty from the date of shipment and undergoes pre-shipment functional testing to verify output accuracy, isolation integrity, and supply current draw within LEM factory specifications. Units are shipped with test documentation upon request. In-stock availability ensures short lead times for both project procurement and emergency replacement orders. For volume procurement, OEM pricing and extended warranty options are available—contact [email protected] or call +86 18359268345 for a quotation.