Beckwith M-2001B Digital Voltage Regulating Controller

Controller does not respond to voltage regulation. External locking contacts are closed, reverse power is locked, voltage limit is exceeded. Check external locking input, reverse power status, and voltage limit settings

When parallel connected, the loop current flows through the large M-0115A, and the sensitivity switch is adjusted for CT polarity reversal. Check the polarity of the CT wiring

Communication cannot be established due to protocol mismatch, address error, wiring issues. Confirm protocol settings and check address and cable connections

Design Evolution and Selection

M-2001B is the digital evolution version of the M-2001 series. Early analog controllers relied on potentiometer settings, and accuracy was affected by temperature and aging. M-2001B adopts a microcontroller and digital settings, and all parameters can be accurately programmed and saved in non-volatile memory. It also introduces new functions such as communication, data recording, and harmonic analysis.

Attention should be paid when selecting:

Confirm the secondary rated value of CT (0.2A, 1A, or 5A) and select the corresponding auxiliary CT.

Confirm the requirement for parallel connection, selecting Δ VAR2 can eliminate M-0115A.

Confirm communication interface requirements (RS-232/RS-485/fiber optic).

Confirm whether a tap position sensor (M-2025B current loop interface module) is required.