ABB UNITROL 1010 (3BHE035301R0001) – Digital AVR for Synchronous Generators and Motors

The ABB UNITROL 1010, part number 3BHE035301R0001, is a compact, digital automatic voltage regulator designed to stabilize generator terminal voltage and manage field excitation with high reliability. From my experience, it’s a popular drop-in choice when you need solid AVR performance on compact gensets or motor excitation panels without building a full custom cabinet. You might notice that the “1010” typically points to a 10 A class field capability—ideal for small to mid-size machines where you still expect fast response and good fault tolerance.

Company’s Order Placement Process and Guarantees

• Warranty: 365 days
• Delivery: 1 week if in stock; no more than one month at the latest
• Payment: 50% advance payment, full payment prior to delivery
• Express options: FedEx, UPS, DHL

Key Features

• Digital voltage regulation – Stable control of generator terminal voltage with fast response to load swings.
• 10 A field capability (variant class) – Well-suited for compact synchronous machines that still need robust excitation.
• Integrated protection functions – Undervoltage/overvoltage and over-excitation protections help protect windings and diodes.
• Flexible sensing – PT/CT inputs for precise voltage and current feedback; typical support for frequency tracking.
• Industrial I/O – Configurable digital I/O and analog channels for permissives, alarms, and setpoint trim.
• Field-proven control algorithms – Reactive power and power factor control modes available in many cases for parallel operation.
• Service-friendly – Parameterization via service port; typically straightforward to commission with guided steps.
• Compact installation – Panel/cabinet mounting simplifies retrofits where space is limited.

Technical Specifications

Note: Exact interfaces and ranges can vary slightly by sub-variant; if you share your generator nameplate and field data, we’ll verify compatibility against 3BHE035301R0001 before shipment.

Application Fields

• Diesel and gas gensets for industrial backup and prime power
• Small hydro and CHP units needing stable voltage and PF control
• Retrofits on aging AVR panels to improve stability and diagnostics
• Excitation control for synchronous motors in process plants
• Parallel operation with grid or multiple generators (VAR/PF modes)

Advantages & Value for Procurement

• Reliability – Field-proven controller with protection features that reduce unscheduled outages.
• Compatibility – Works with standard PT/CT sensing and typical field circuits; retrofit-friendly wiring.
• Cost Control – Short commissioning time; in many cases, no need for a complete panel redesign.
• Lifecycle Support – Spares availability and documented parameters make maintenance more predictable.

A maintenance lead at a power plant told us they swapped a UNITROL 1010 into an older genset and were able to complete basic tuning in under two hours. That seems to be the norm when the incoming wiring is clean and the PT/CT ratios are known.

Installation & Maintenance

• Cabinet & Environment – Install in a clean, dry, ventilated enclosure; follow typical IP-rated cabinet practices; avoid high vibration zones.
• Wiring – Use shielded twisted-pair for PT/CT and control I/O; segregate from high-current field cabling; verify polarity on CTs.
• Grounding – Bond the AVR reference to the control ground as per ABB guidelines; keep ground loops minimal.
• Commissioning – Load correct PT/CT ratios, enable protections, and perform step-response checks on no-load and partial-load.
• Routine Care – Periodic dust cleaning, terminal torque checks, and backup of parameter sets; update firmware when released and validated.
• Safety – De-energize field circuits and discharge stored energy before service; lockout/tagout per site rules.

Supporting components we commonly supply with UNITROL 1010: field breaker/contactor, freewheel diodes, shunt/CT adapters, and cabinet accessories (aux PS 24 VDC, terminal blocks). These typically streamline retrofits.

Quality & Certifications

• CE marking for applicable EMC and low-voltage directives
• RoHS compliance for restricted substances
• Manufacturing under ISO 9001 quality systems
• Manufacturer’s warranty: 12 months (365 days)