Overview

The AVK COSIMAT N+ Automatic Voltage Regulator (AVR) represents cutting-edge voltage regulation technology designed specifically for synchronous AC alternators in both single-unit and parallel generator operations. Manufactured by AVK SEG (part of the Cummins Generator Technologies family), the COSIMAT N+ has established itself as one of the most reliable and durable voltage regulators available for demanding industrial, commercial, and mission-critical power generation applications. This advanced AVR continuously monitors output voltage and automatically adjusts the excitation current to the alternator's rotor, ensuring stable, consistent power delivery regardless of load fluctuations, input voltage variations, or changing environmental conditions. Whether you're operating a single standby generator at a hospital, running parallel generators at a data center, or managing prime power at a remote industrial facility, the COSIMAT N+ delivers precision voltage control with exceptional reliability.

As a genuine OEM replacement part backed by the reputation of both AVK and Cummins, the COSIMAT N+ AVR incorporates sophisticated microprocessor-based control algorithms that provide superior voltage regulation accuracy compared to older analog designs. The regulator features comprehensive protection functions including under-frequency protection, over-excitation limiting, and voltage droop for load sharing in parallel operations. Its robust construction with conformal-coated circuitry ensures reliable operation in harsh environments with high humidity, dust, vibration, and extreme temperatures. The COSIMAT N+ supports a wide range of AVK alternator models and offers flexible configuration options to match specific application requirements. When you choose the COSIMAT N+ from General Power, you're investing in proven technology that protects your generator investment, minimizes downtime, ensures clean power delivery to sensitive equipment, and provides years of trouble-free service in the most challenging power generation environments.

Key Specifications

Compatible Alternator Models

The AVK COSIMAT N+ AVR is engineered for compatibility with a comprehensive range of AVK alternator series, making it a versatile solution for numerous generator applications across various power ratings. This voltage regulator is the OEM-specified component for many AVK alternators including the DSG, DSI, DIG, DIH, and DII series alternators commonly found in industrial and commercial generator sets. The COSIMAT N+ works seamlessly with both brushless synchronous alternators and configurations using permanent magnet generator (PMG) excitation systems. It's particularly well-suited for AVK alternators in the 10 kVA to 3000 kVA power range, though specific compatibility depends on alternator configuration and application requirements. Common applications include Cummins generator sets, FG Wilson generators, and numerous other OEM generator manufacturers who specify AVK alternators in their designs. The regulator supports both single-bearing and double-bearing alternator configurations and can be configured for various voltage outputs including 120/240V, 220/380V, 230/400V, 240/415V, and 277/480V three-phase systems. If you're unsure whether the COSIMAT N+ is the correct AVR for your specific alternator model or generator application, our technical support team at General Power can verify compatibility using your alternator serial number or generator model information—simply call 1-888-769-3758 and our bilingual specialists will confirm the exact part you need.

Why Buy from General Power

When you purchase your AVK COSIMAT N+ AVR from General Power, you're choosing a trusted authorized dealer with over two decades of experience supplying genuine OEM generator parts to customers across North America. We stock only authentic AVK/Cummins manufactured voltage regulators—never aftermarket imitations or refurbished units—ensuring you receive a factory-fresh component with full manufacturer warranty protection. Our extensive inventory and strategic warehouse locations enable us to offer same-day shipping on orders placed before 3 PM EST, getting your critical replacement part to you quickly to minimize costly generator downtime. Unlike discount sellers who offer parts-only transactions, General Power provides comprehensive support including pre-purchase compatibility verification, installation guidance, and ongoing technical assistance from our team of certified generator technicians. Our bilingual customer service team (English/Spanish) is available at 1-888-769-3758 to answer questions, provide technical specifications, verify part numbers, and assist with troubleshooting. We understand that voltage regulator failures can impact critical operations, which is why we maintain deep inventory, offer competitive pricing on genuine OEM parts, and back every sale with expert support. Whether you're a facility maintenance professional, generator service technician, electrical contractor, or equipment owner, General Power delivers the authentic parts, technical expertise, and responsive service you need to keep your power generation equipment operating reliably. Order your AVK COSIMAT N+ AVR today with confidence knowing you're working with a proven partner committed to your success.

Installation Overview

Installing the AVK COSIMAT N+ AVR requires basic electrical knowledge and adherence to proper safety procedures. Before beginning any work, ensure the generator is completely shut down, disconnected from all power sources, and properly locked out/tagged out according to safety regulations. Here's a general overview of the installation process:

• Step 1 - Remove the Failed AVR: Locate the existing voltage regulator, typically mounted inside the generator control panel or alternator terminal box. Carefully photograph or diagram all wire connections before disconnecting them—noting wire colors, terminal designations, and connection points. Remove mounting screws and extract the old AVR, inspecting connections for signs of heat damage, corrosion, or loose terminals that may have contributed to the failure.
• Step 2 - Verify Compatibility and Prepare New AVR: Compare the new COSIMAT N+ with the removed unit to confirm matching terminal configurations and mounting points. Review the AVR's technical documentation to verify any DIP switch settings, jumper configurations, or adjustable potentiometers are set correctly for your alternator's voltage, frequency, and application requirements. Some installations may require specific configuration for droop settings (parallel operation), under-frequency protection levels, or voltage adjustment ranges.
• Step 3 - Install and Connect the New AVR: Mount the COSIMAT N+ securely using the provided brackets or mounting points, ensuring adequate ventilation around the unit for proper cooling. Reconnect all wiring according to your documentation or photos, paying careful attention to power input connections, sensing leads, excitation output wires, and any auxiliary connections for features like remote voltage adjustment or parallel operation control. Verify all connections are tight and properly seated in their terminals.
• Step 4 - Testing and Adjustment: With all connections verified, restore power to the generator following proper startup procedures. Monitor voltage output using calibrated test equipment, checking that the generator produces rated voltage under no-load conditions. Apply load incrementally while monitoring voltage stability and regulation performance. If adjustment is necessary, use the voltage adjustment potentiometer on the AVR to fine-tune output to the exact specified voltage. For parallel generator applications, verify proper load sharing and droop settings according to system requirements.

Important: This overview provides general guidance only. Always consult the specific installation manual for your alternator model and the COSIMAT N+ technical documentation. If you lack experience with generator electrical systems, contact a qualified generator service technician. General Power's technical support team at 1-888-769-3758 can provide installation guidance and answer specific questions about your application.

Frequently Asked Questions

Q: What does the AVK COSIMAT N+ AVR do?
A: The COSIMAT N+ is an automatic voltage regulator that maintains consistent AC output voltage from your generator's alternator regardless of load changes or engine speed variations. It continuously monitors the alternator's output voltage and automatically adjusts the DC excitation current to the rotor field windings, increasing or decreasing magnetic field strength to keep output voltage stable within ±0.5-1.0% of the setpoint. This ensures your generator delivers clean, stable power that protects sensitive electrical equipment, prevents voltage sag under heavy loads, and eliminates voltage spikes when loads are removed.

Q: How do I know if my AVR is failing or has failed?
A: Common symptoms of AVR failure include: generator producing no voltage output (most common), voltage output significantly higher or lower than rated specs, voltage fluctuating wildly with load changes, generator failing to build up voltage during startup, intermittent voltage drops or surges, or visible damage to the AVR such as burned components, discoloration, or melted housing. Additionally, if your generator shuts down on over/under voltage faults repeatedly, or if you notice the AVR is extremely hot during operation, these indicate potential regulator problems. When AVR failure is suspected, testing with a multimeter and inspection by a qualified technician can confirm the diagnosis.

Q: Is this an OEM genuine AVK part or an aftermarket replacement?
A: General Power supplies only genuine OEM AVK COSIMAT N+ voltage regulators manufactured by AVK SEG, a division of Cummins Generator Technologies. This is the exact same part supplied with new AVK alternators and specified by generator manufacturers—not an aftermarket substitute, clone, or refurbished unit. Genuine OEM parts ensure proper fit, correct performance specifications, full compatibility with your alternator's design, and eligibility for manufacturer warranty coverage. Every COSIMAT N+ we sell comes in original AVK packaging with authentic part numbers and documentation.

Q: What warranty coverage comes with the COSIMAT N+ AVR?
A: The AVK COSIMAT N+ includes manufacturer warranty coverage against defects in materials and workmanship. Standard warranty terms typically provide 12-24 months of protection from the date of purchase, though specific terms may vary based on application and installation conditions. Warranty coverage requires proper installation by qualified personnel, operation within specified parameters, and use in compatible applications. General Power provides complete warranty documentation with every AVR purchase and assists with warranty claims if issues arise. For specific warranty terms applicable to your purchase, contact our customer service team at 1-888-769-3758.

Q: Can I get technical support for installation and troubleshooting?
A: Absolutely! General Power provides comprehensive technical support for all products we sell, including the AVK COSIMAT N+ AVR. Our team of experienced generator technicians can assist with pre-purchase compatibility verification, installation guidance, wiring diagrams, configuration settings, voltage adjustment procedures, and troubleshooting assistance. We offer bilingual support in English and Spanish at 1-888-769-3758 during business hours. Whether you need help identifying the correct replacement part, understanding terminal connections, setting up parallel operation, or diagnosing voltage regulation issues, our knowledgeable staff is ready to help ensure successful installation and optimal performance.

Order Today

Don't let a failed voltage regulator keep your critical generator offline. The AVK COSIMAT N+ AVR is in stock at General Power and ready to ship today, backed by our commitment to genuine OEM quality, competitive pricing, and expert technical support. Whether you're replacing a failed regulator to restore generator operation, stocking spare parts for preventive maintenance, or upgrading to improve voltage stability, we make ordering fast and easy. Our same-day shipping ensures minimal downtime for your power generation equipment, and our knowledgeable team is standing by to verify compatibility, answer technical questions, and provide the support you need for successful installation. Call 1-888-769-3758 now to speak with a generator parts specialist, or place your order online with confidence knowing you're getting authentic AVK quality from a trusted authorized dealer. Experience the General Power difference—genuine OEM parts, expert support, fast shipping, and the reliability your critical power systems demand. Order your AVK COSIMAT N+ Automatic Voltage Regulator today!