Beckwith Electric M-7651A D-PAC

The M‑2979 cabinet houses the M‑7679 R‑PAC and components, for

complete recloser control replacement applications

• Provides easy direct replacement of recloser controls for Cooper, G&W,

Elastimold, SEL, ABB, Whip & Bourne, Joslyn, and Tavrida reclosers

• Eliminates the need for expensive rewiring of I/O signals accepting

existing connector plugs for Power, Control, Voltages and Currents

with the same pin sequence

• Accepts the existing communications connections for Serial TIA‑232.

TIA‑485. Fiber Optic and IRIG‑B

• Simplifies upgrading communications to optional true embedded

Ethernet ports in the M‑7679 R‑PAC allowing for multi‑user, multi‑

protocol access to the advanced metering, PQ and DFR information

collected by the control

• Includes an on board smart 24 V battery charger with 12 V and 24 V

outputs

The M‑2979 includes the capability to change out the Recloser Control

and Cabinet as one component. The M‑2979 Recloser Control Cabinet

and M‑7679 R‑PAC combination includes all the required interface

connections and external communications capabilities that are necessary

to replace an existing recloser control.

The M‑2979 Recloser Control Cabinet meets or exceeds NEMA 250. IEC

60529 and IEEE C37.60.

Each M‑2979 Recloser Cabinet can be configured with the optional support

equipment to match the existing recloser control application and environment,

or the cabinet can be supplied completely empty.

The M‑0127A AC Current Relay is primarily designed as a recommended

addition to the Circulating Current or Delta VAr1 Paralleling configurations

used with LTC Transformers. Its purpose is to monitor the current in the

circulating loop between transformers, and interrupt Motor Power to its

monitored transformer, should the circulating current exceed a

predetermined value. The M‑0127A range permits the maximum circulating

current to be set from 5% to 50% of the rated full load current.

Other relays used for this purpose have an impedance exceeding 5.000 Ω

which may cause the main CT to saturate, making the entire circulating

current scheme operate poorly. The low impedance of the M‑0127A relay

avoids this problem.

The output should be connected in series with the common lead of the

automatic control circuit of the motor starter relay. When used with the

Beckwith Electric M‑0067E control, the M‑0127A output contacts will be

in series with the lead that would otherwise have gone directly to terminal

TB1‑8 of the M‑0067E. Polarity of the M‑0127A input and output can be

ignored.

The M-7679 R-PAC offers protection, automation, and control capabilities

for recloser, switch, sectionalizer, and advanced distribution automation

applications. It has over 30 protection elements for optimal protection

of power distribution systems. It is compatible with three-phase ganged

and independent phase capable switching devices such as reclosers,

switches, sectionalizers, and breakers. It has up to six standard or low

energy analog (LEA) voltage inputs. The M-7679 R-PAC has a recloser

settings wizard that assists in creating files for most common settings

for recloser applications. The comprehensive I/O matrix provides visual

confirmation of enabled functions and selected outputs, improving security.

Additionally, it includes one of a kind Sensitive Ground Indicator feature to

detect high-impedance faults on the distribution line.

The M‑2067B is an adapter panel which, when combined with the M‑2001

Series Digital Tapchanger Control, provides convenient direct replacement

for Westinghouse SVC and SVR controls and Beckwith Electric M‑0067

series controls. The M‑2067B can also be used, with the M‑2001 Series

Tapchanger Control, as a general purpose LTC transformer control.

The M‑2067B permits changing of the M‑2001 control without adapter

panel removal or rewiring.

Applications

• Connects easily to the M‑2001Series Digital Tapchanger Control using

four mounting screws and 24‑pin connector

• Provides mounting adaptable to several different configurations

• Provides built‑in CT shorting protection when the M‑2001 Series Digital

Tapchanger Control is removed

The M‑2053 is an adapter panel which permits M‑2001 Series Digital

Tapchanger Controls to be surface‑mounted while providing access points

for wire terminations.

Testing Specifications

High Voltage: All input and output terminals will withstand 1500 Vac rms to

chassis or instrument ground for one minute with a leakage current not to

exceed 25 mA, for all terminals to ground. Input and output circuits are

electrically isolated from each other, from other circuits and from ground.

Surge Withstand Capability: All input and output circuits are protected against

system transients. Units pass all requirements of ANSI/IEEE C.37.90.1-1989

defining surge withstand capability.

Radiated Electromagnetic Withstand Capability: All units are protected against

electromagnetic radiated interference from portable communications transceivers

as outlined in ANSI/IEEE C37.90.2-1987 defining radiated electromagnetic 

withstand capability.

• M-2948 Tap Position Sensor directly mechanically replaces the Selsyn-Type Tap

Position Sensor.

• Directly interfaces with a 4 to 20 mA output to the M-2025D Current Loop Interface

which provides the tap position to the M-2001 Series Tapchanger Control.

• Rotation – 0 to 210°, 297°, 306°, 315°, 325°, 330°, 340° and 350° configurations

• Degrees per Tap – 9° or 10°

• Neutrals – 1, 2, 3, 5 or 6

• Rotation Direction – Tap Position Sensors are available with either a positive

or negative rotation. With positive rotation, the shaft of the M-2948 rotates

clockwise while raising taps. With negative rotation, the shaft of the

M-2948 rotates counter-clockwise while raising taps.