Description
📍 The Lloyd 577873 (featuring drawing / module code 11.0101) is a specialized Automatic Voltage Regulator (AVR) PCB Module engineered for industrial generators, alternator excitation systems, and commercial power generation units, providing precise voltage control and stability under fluctuating load conditions.
🔧 Product Datasheet Parameters
- 🌐 Brand & Model: Lloyd / 577873 / AVR Module Code 11.0101
- 🏷️ Type: Automatic Voltage Regulator / Excitation Control Circuit Board
- 📏 Dimensions: Standard industrial printed circuit board assembly format designed for generator terminal box or control panel integration
- ⚖️ Weight: Approximately 0.6 kg to 1.0 kg
- 🌍 Country of Origin: United Kingdom / Europe
- ⚡ Sensing & Power Input: Engineered to accommodate standard generator auxiliary winding inputs or permanent magnet generator (PMG) power sources
- 🔌 Field Output: Modulated DC excitation current output designed to drive alternator rotor field windings
- 💻 Compatibility: Integrated within specialized marine and land-based industrial generator sets utilizing Lloyd-specified excitation systems
- 🔗 Terminals: Hardwired plug-in or screw terminal blocks for sensing lines, field connections, and external potentiometer adjustments
- 🛡️ Enclosure Protection: Open circuit board module featuring protective conformal coating to guard against humidity, salt mist, and environmental contaminants
❓ Frequently Asked Questions (Q&A)
💡 Q1: What is the primary function of the Lloyd 577873 module? A1: It continuously monitors the output voltage of an AC generator and adjusts the exciter field current to maintain a stable, predetermined voltage level across varying loads.
💡 Q2: What do the numbers 577873 and 11.0101 signify? A2: 577873 represents the primary part or stock identification number, while 11.0101 typically designates the specific engineering revision or circuit board layout drawing version.
💡 Q3: Where is this regulator typically mounted? A3: It is usually installed inside the generator’s terminal junction box enclosure or housed within a dedicated generator control and excitation panel.
💡 Q4: Are external adjustments supported by this board? A4: Yes, provision is typically made for an external manual voltage adjustment potentiometer (trimmer) to fine-tune the baseline output voltage.
💡 Q5: Is this exact AVR model currently in active factory production? A5: This component belongs to specialized industrial and marine legacy electrical lines, primarily sourced through dedicated generator parts distributors and surplus markets.
💡 Q6: What storage conditions are recommended for the PCB? A6: It should be stored in an antistatic bag within a clean, dry environment with ambient temperatures ranging between -20°C and +70°C.
💡 Q7: What precautions should be taken before handling or replacing the unit? A7: Ensure the prime mover is completely shut down and all residual magnetism, field power, and auxiliary power sources are safely isolated to prevent electrical shock.
💡 Q8: Does the board incorporate built-in protection features? A8: Yes, standard AVR circuitry typically includes under-frequency (V/Hz) roll-off protection and internal fusing to prevent overexcitation damage.
💡 Q9: Can this module be used as a universal replacement for other AVR brands? A9: No, it is specifically configured for electrical parameters and terminal mappings matching Lloyd excitation systems and must be verified against generator specs.
💡 Q10: What symptoms indicate a failing AVR module? A10: Symptoms include fluctuating output voltage, complete loss of generator voltage build-up, or high voltage spikes during load steps.
🔄 Recommended Alternative Series and Models from Lloyd / Generator Excitation
- ⚙️ Lloyd Alternative AVR Variants – Specific matching revision circuit boards carrying alternate drawing numbers in the 11.xxxx series.
- ⚙️ Basler Electric AVC63-4 – Microprocessor-based digital voltage regulator for general industrial alternators.
- ⚙️ Stamford AS440 – Analog automatic voltage regulator featuring under-frequency protection and external trimming.
- ⚙️ Leroy-Somer R250 – Shunt-type AVR module for commercial alternator systems.
- ⚙️ Kutai Universal AVR – Replacement automatic voltage regulator suitable for various brush and brushless generators.
