Beckwith M-2001B Digital Voltage Regulating Controller

Beckwith M-2001B Digital On Load Voltage Regulating Controller Application and Networking Guide

In the power system, on load tap changers (LTC) and line regulators are key equipment for maintaining voltage stability. Traditional analog voltage regulators (such as Westinghouse SVC/SVR, GE, etc.) have problems such as limited accuracy, lack of communication capability, and inconvenient parameter tuning. The M-2001B digital on load voltage regulation controller launched by Beckwith Electric, with a microcontroller as its core, provides high-precision voltage regulation while integrating rich communication protocols, data recording, parallel operation, and reverse power processing capabilities. It can adapt to various conversion panels to directly replace mainstream old models. This article is based on technical specifications and systematically analyzes the functional architecture, parameter settings, system integration, and networking applications of M-2001B, providing a complete reference for power engineers.

Product positioning and core advantages

M-2001B is a digital voltage regulator with microcontroller architecture, suitable for on load voltage regulating transformers and single-phase line voltage regulators. Its core advantages include:

High precision adjustment: The voltage band center can be set to 100-135V (step size 0.1V), and the bandwidth can be 1-6V (step size 0.1V), meeting the accuracy requirements of ANSI Class 1.

Flexible compensation: Supports R-X line voltage drop compensation (± 24V adjustable) and Z compensation (0~+24V), CT-VT phase angle correction 0 °~330 ° (step size 30 °).

Multiple timing modes: deterministic delay 1-120 seconds, inverse delay 1-120 seconds, and in sequential mode, the Tap interval delay can be set to 0-60 seconds.

Rich communication interfaces: dual RS-232 ports (COM1 top mounted, COM2 front mounted), optional RS-485 or fiber optic (ST interface), supporting multiple protocols such as BECO 2200, DNP3.0, MODBUS, UCA2.0, etc.

Powerful data management: real-time measurement, demand measurement (15/30/60 minutes), load recording, harmonic analysis (up to 31 times), Drag Hands with time stamps.

Multiple parallel connection methods: support circulation method (M-0115A required), external master slave, and Δ VAR ™ The law.

Reverse power processing: can be set to ignore, lock, reverse adjust, or return to neutral point.

UL certification: meets industrial safety standards.

This product can be adapted to various conversion panels, directly replacing the widely used old voltage regulating controllers in the industry without the need for large-scale modification of the panel surface.

Detailed explanation of core functions

2.1 Voltage regulation and timing logic

M-2001B continuously monitors the local voltage and compares it with the set band center and bandwidth. When the voltage deviates from the bandwidth, the timer starts:

Deterministic delay: issuing a boost or buck command after a fixed time.

Inverse time delay: The larger the deviation, the shorter the delay (similar to the overcurrent inverse time characteristic).

Sequential mode and non sequential mode:

Non sequential mode: The timer resets immediately after each voltage adjustment action, and if the voltage still exceeds the limit, the timer continues to count, allowing for rapid and continuous voltage adjustment.

Sequential mode: The timer only resets after the voltage returns to the band, ensuring sufficient interval between each action (InterTap Delay can be set) to reduce mechanical wear.

2.2 Line voltage drop compensation (LDC)

The LDC function is used to compensate for the voltage drop caused by the load current on the feeder impedance, keeping the voltage at the receiving end (load center) at the set value. M-2001B provides:

R and X compensation: adjustable ± 24V each, with a step size of 1V.

Z compensation: amplitude type compensation (0~+24V), suitable for situations where phase differentiation is not required.

CT-VT phase angle correction: Adjust the phase of the current relative to the voltage in 30 ° steps to ensure the correct compensation direction.

The compensation calculation formula is based on the measured load current and the set R/X/Z values. The controller automatically calculates and corrects the reference voltage to keep the load center voltage constant.

2.3 Voltage Limitation and Runback

M-2001B provides multiple voltage protection:

Overvoltage/undervoltage independent limit: adjustable from 95~135V, with a step size of 0.1V.

Rollback function: When the overvoltage exceeds the limit and exceeds the rollback dead zone (adjustable from 1 to 4V), the controller forces the voltage to drop to a safe range.

Tap position limit: Users can set upper and lower limits to prevent taps from exceeding the mechanical allowable range of the transformer.

2.4 Voltage Reduction

Supports up to three independent voltage reduction steps, each step can be set to 0%~10% (based on the center), suitable for night light load or energy-saving mode. It can be remotely activated/deactivated through external contacts or communication.

Reverse power detection and processing

M-2001B has reverse power detection capability and is suitable for two scenarios: transformer LTC and single-phase voltage regulator: