Description
Product Introduction
The ABB UNITROL 1010 (3BHE035301R1002) is a digital automatic voltage regulator for synchronous generators and motors up to roughly 50 MVA. It controls rotor field current through IGBT power stages, maintaining terminal voltage within ±0.5% under steady-state load conditions.
The unit integrates power system stabilizer (PSS), over-excitation and under-excitation limiters, and V/Hz protection without external auxiliary modules. Dual Ethernet and RS-485 ports support Modbus TCP and Modbus RTU, allowing integration with plant DCS or SCADA systems through CMT 1000 commissioning software.
Frequently Asked Questions
Q: Is this module still in active production by ABB?
A: Honestly, the UNITROL 1000 platform is mature but not formally discontinued in all variants. ABB still supports it through authorized channels, but availability varies by region. The realistic source for immediate delivery is New Surplus from OEM overstock or decommissioned panels. Verify with an ABB rep whether your specific hardware revision remains orderable.
Q: What is the most common mistake when replacing a UNITROL 1010?
A: The most common mistake is ignoring firmware version mismatch. Firmware revisions across the 3BHE035301R1002 family are not always backward-compatible. A newer module with different DSP firmware can fail to communicate with your existing CMT 1000 project or mis-handle PSS parameters. Record the old unit‘s firmware revision before ordering. Also photograph the DIP switch and jumper positions—the RS-485 bus termination resistor default is disabled, which causes packet loss on multi-drop trunks.
Q: Will I lose my configuration when swapping the hardware?
A: The configuration lives in the module’s non-volatile memory and is loaded from CMT 1000 during commissioning. If you swap in a replacement without downloading your saved configuration file, the unit boots with factory defaults. The most common mistake is assuming the new module arrives pre-configured for your generator. It does not. Export your .cfg file from the old unit first, then download it to the replacement using the USB service port.
Q: What is the difference between 3BHE035301R1002 and other UNITROL 1010 order codes?
A: In our experience, the R1002 suffix denotes a standard single-channel configuration with dual Ethernet ports. Other suffixes like R0001 or R0003 indicate different hardware revisions or basic variants with reduced I/O. They are not always pin-compatible across revision generations. Verify the exact suffix against your original module’s nameplate. The UNS0121A-Z,V1 software version also matters for parameter structure compatibility.
Q: Are these factory-new or refurbished?
A: Units described as New Surplus come from OEM overstock, cancelled projects, or decommissioned cabinets. They are not repaired boards. Every unit should be tested on a powered excitation test rack with field current simulation and communication handshake verification. We do not claim 100% failure-free. What we claim is tested functionality with documented test results.
