Modes of Operation

Either of the following modes are available as determined by the presence or absence of a cam switch which

is closed while the LTC is in transition.

Non‑Sequential Mode: The timer resets after a tapchange, regardless of voltage.

Sequential Mode: The timer resets only after the sensed voltage is back within the control band.

LED Indicators

The RAISE and LOWER LEDs light to indicate a voltage outside the band and a forthcoming tapchanger

operation as soon as the timer times out. With a slowly varying input, operation of the LEDs and initiation of

timing is very sharp with 0.2 V hysteresis. The LEDs have an expected life of 25 years.

Output Contacts

Two outputs drive a raise and lower motor starter relay. The starters may be any voltage up to 240 Vac. The

output contacts are rated at 2.5 A inrush current and will handle a NEMA size 1 starter or smaller.

Voltage Measurement Accuracy

The unit meets the requirements of accuracy Class 1 as defined in ANSI standards C57.12.30‑1977 paragraph

9.3 and C57.15‑4.2 when tested according to C57.15‑1986 paragraph 9.4.1.

Response Time

M‑0067E Tapchanger Control – Specification

The M‑0067E will respond to 5/8% voltage change in 0.2 seconds, ensuring freedom from hunting on

minimum bandwidth.

Voltage Reduction Options

One‑ or Two‑step Voltage Reduction: Resistors for one or two pre-selected steps of voltage reduction will

be mounted on the printed circuit board at the factory.

Three‑step Voltage Reduction: Resistors for a maximum of three pre-selected steps, will include the

internally-mounted resistors mentioned above, plus an additional externally-mounted resistor sized by the

factory.

Instantaneous (non‑time delayed) Voltage Reduction: Circuitry is added at the factory.

50 Hz Operating Frequency Option

This option is available for use in countries outside the continental United States and Canada. The unit will

be shipped with the standard 60 Hz operating frequency unless otherwise specified.

Low Voltage Protection: Outputs are blocked from operating at input voltages below approximately 60 Vac.

A proper raise output will be obtained down to this threshold.

Front Panel Controls

VOLTAGE CENTER OF BAND: The center of the control band may be set to any voltage from 105 to

135 Vac. The scale calibration accuracy is ± 0.5 V at 120 Vac.

TOTAL BANDWIDTH: The bandwidth control can be adjusted from 1.0 to 6.0 V. The scale calibration

accuracy is ± 0.3 V.

TIME: The timer is adjustable from 0 to 120 seconds, with a scale calibration accuracy of ± 10% of setting or

± 2 seconds, whichever is greater. The timer starts when the voltage goes outside the band and resets within

a few milliseconds upon return to the band or when reset by an external contact in the Non-Sequential mode.

LINE DROP COMPENSATOR: The resistance compensation provides 24 V compensation for 0.2 A input in

phase with the input voltage. The reactance compensation provides 24 V compensation for 0.2 amps input

at a phase angle of ± 90° as chosen by the DIRECT/REVERSE switch. The magnitude and angle of each

circuit is individually set by a pair of trimpots to any accuracy limited only by the instruments used in setting.

The factory setting of magnitude will be within ± 5% and the phase angles within ± 2%. The voltage and two

current circuits are isolated from each other and do not interact.

TEST/OPERATE: When this switch is in the TEST position, the Line Drop Compensator is deactivated and

the voltage may be raised and lowered by means of an uncalibrated voltage control. An external voltmeter

with a burden of 500 Ω per V or higher can be connected to test the band limits by observing when the

RAISE and LOWER LEDs light. No special test voltage source required.

General Purpose LTC Transformer Control or Replaces Westinghouse SVC

and SVR Controls

• Adaptable to any LTC Transformer – old or new

• Meets ANSI Class 1 (1%) Accuracy Requirement

• Now in Use by Leading Manufacturers as Standard Equipment

Features

Line Drop Compensation, Non-Sequential and Sequential modes of operation, and manual voltage adjustment

capability is included.

Inputs

Power: A two wire input, requiring less than 3 W at 90 to 140 Vac, provides all power requirements. The unit

should be powered from a potential transformer or from the voltage to be controlled.

Line Current: Line drop compensation is provided by a CT input with a 0.2 A nominal full scale rating. The

burden imposed by this input on the current source is 0.03 VA. A Beckwith Electric model M-0121 (5 A to

0.2 A) or M-0169 (5 A or 8.66 A to 0.2 A) Auxiliary Current Transformer is available when required.

Circulating Current: Parallel operation of transformers is provided by a second CT input with a 0.2 A nominal

full scale rating. The burden imposed by this input on the current source is 0.005 VA. A paralleling input with

a 0.2 A full scale rating gives approximately 24 V correction at approximately 90° for parallel operation with

other transformers.

Features of the M-2001C include:

• Front RS232 Null Modem.

• Optional 10BaseT Ethernet half duplex.

• BECO 2200 interface.

• Ten on-board communication protocols.

• Field-updatable programming.

• Reverse power detection/operation.

• Demand metering/data logging with date/timestamp.

• Overcurrent protection.

• SCADA HeartBeat and manual HeartBeat timer.

• LDC with R & X or Z-compensation.

• Supports terminal mode for modem communications in TapTalk.

• Transformer paralleling by circulating current, external master-follower

circuitry, or ∆VAR® methods.

• Standard LCD display (rated -20 to +70 degrees Celsius)

• vacuum fluorescent display optional (rated -40 to +80 degrees Celsius).

• Optional control power backup input for Fiber Optic loop-through

communication.

• M-2829 TapPlot® analysis software enables the plotting, printing,

and analysis of tap information.

The M-2001C Tapchanger Control line features an innovative concept

in new transformer or regulator applications or control replacements,

by using a universal tapchanger control with interchangeable adapter

panels. The replacement panels are sized to correspond to the original

manufacturer’s controls, use the same mountings, and include wire

harnesses that match the existing connections – all for easy replacement.

The M-2001 is an LTC transformer, substation regulator, and line regulator

control that provides reliable operation with expanded capabilities.

It is available in four models: Comprehensive, Base-T, Base-RS and Base-R.

The M-2001 Tapchanger Control line features an innovative concept in new

transformer or regulator applications, or control replacements by using a

universal tapchanger control with interchangeable adapter panels.

The replacement panels are sized to correspond to the original manufacturer’s

controls, use the same mountings, and include wire harnesses that match the

existing connections – all for easy replacement. 

• Cyber Security – Comprehensive cyber security tools to implement NERC

CIP requirements, including IPsec and RADIUS server security.

• VAr Bias for downstream coordination with capacitor controls.

• Tap position knowledge by four KeepTrack™ methods.

• Transformer paralleling by circulating current, Peer to Peer Master/Follower,

Peer to Peer ∆VAR® circuitry, or legacy ∆VAR® methods.

• LCD display (rated 20 to +70 degrees Celsius) or Vacuum Fluorescent display

optionally available (rated 40 to +80 degrees Celsius).

• Optional control power backup input for Fiber Optic communication loop through.

The M-2001D is an updated version of the earlier M-2001 line.

It is an LTC transformer, substation regulator, and line regulator control that

provides reliable operation with expanded capabilities, such as expanded

communication options and improved UI with programmable alarm LEDs

and additional pushbuttons, including a Wake button that can be programmed

to scroll specific display screens, e.g., for lineman use.

• Modbus, DNP3. and IEC 61850 communication.

• Optional 10/100BaseT Ethernet with up to 8 simultaneous sessions

(up to 5 sessions can use DNP) and expanded Baud rate up to 115000 bps.

• Optional Fiber Optic Ethernet.

• Front USB port for quick programming in the field.

• RS232. RS485 and Fiber serial ports.

• SmartFlash SD card for loading, saving settings, data logging, and quick

firmware update.

• Smart reverse power detection/operation with VT configuration for source

and load sides.

• Demand metering/Datalogging with date/time stamp (Single/Three Phase)

• LDC with R & X or Z compensation.

• Sequence of events (SOE) recording.

• Source PT voltage input.

• Harmonic analysis.

• CBEMA monitoring.

M-2017 Tool Safely Discharges Capacitor Voltage in 2 Minutes

The M-2017 capacitor bank discharge tool is designed to reduce

the voltage of capacitors to a secure level using a controlled

discharge method, completing the process within just 2 minutes.

This discharge tool is equipped with an LED indicator that provides

real-time status updates to ensure safe operation, signaling to the

user when the capacitors have reached a safe level for handling.

For enhanced safety, the M-2017 features an advanced protection

mechanism that activates when 24V is detected in the main unit.

This capacitor discharge tool prevents any discharge of the capacitors,

maintaining stability and safety regardless of actions taken by the

technician. This makes the M-2017 an essential discharge tool for 

technicians working in environments where capacitor handling is

frequent, providing both efficiency and peace of mind in operations.

• Safely discharges M-2979 cabinet capacitors

• Dual-channel, 53V-250V voltage range

• Operates at -40ºC to +60ºC.

The M-2017 capacitor bank discharge tool features an advanced safety

mechanism that prevents unintended discharges, ensuring technician

safety with a visual LED indicator for real-time status updates.

Construction

Molded Lexan®

• Body and door fabricated from molded Lexan

• EXL 9330 Copolymer (.150″ nominal thickness)

• UV Inhibitor• Passed drop test on all eight corners

• Flame Retardant UL 94V-0

• NEMA 3RX water ingress and corrosion protection

• Stronger than standard polycarbonate

• Excellent low temperature impact strength (11 ft. lb./in. @ -60° F) ASTM D256

• Silicone closed cell gasket

• External adjustable mounting bracket

• Integral door hinges with stainless steel hinge pin

• Enclosure door accommodates optional power supplies, battery and communications devices

• External Grounding stud provided

Cold Rolled Steel/Stainless Steel (304)

• Body and door fabricated from 14/16 gauge steel

• Continuously welded seams ground smooth

• Closed cell neoprene gasket

• External adjustable mounting bracket

• Stainless steel door hinge

• Enclosure accommodates optional power supplies, battery and communications devices

• External Grounding stud provided

• Powder coated, ANSI 70 Grey