Beckwith Electric M-2279D Adapter Panel

Adapts M‑2001 Series Digital Tapchanger Control to Replace Pennsylvania

Transformer and McGraw‑Edison LTC Transformer and Regulator Controls

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

mounting screws and 24‑pin connector

• Provides direct mechanical replacement of the old LTC transformer or

regulator control using the same four mounting studs, front door brace

and locking knob

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

Tapchanger Control is removed

• Optional SCADA Cutout switch (for use with SCADA enabled M‑2001C

controls) allows local blocking of SCADA commands

• Optional SCAMP™ (SCADA Controlled Auto/Manual Pushbutton) switch

replaces AUTO/OFF/MANUAL toggle switch and allows the Auto/Manual

state of the adapter panel to be changed by a SCADA command

• Optional Voltage Reduction switch allows Local Voltage Reduction

1 or 2 to be initiated provides convenient direct replacement for the

following Pennsylvania Transformer and McGraw‑Edison LTC transformer

and regulator controls manufactured from 1963–1978: 550. 550A, 550B,

550C, 396B, 494B, 496B, 995 and 996.

Interface

External connections are made at two terminal blocks located on the rear

panel of the M‑2279D, and at two terminal blocks located on the printed

circuit board. These terminal blocks provide access to auxiliary functions,

including self-test alarm, user-programmable alarm, auto disable and manual

raise/lower. A fifth terminal block provides for the addition of the M‑0329B

LTC Backup Control. The four mounting studs, front door brace and the front

door locking knob must be saved from the existing control cabinet.

Features

Separate fuses for test terminal, voltage sensing and motor power are located

on the front panel. Spare fuses for each are in the fuse holder.

Binding posts on the front panel allow easy connections for test procedures.

RAISE/OFF/LOWER, AUTO/OFF/MANUAL and VOLTAGE SOURCE switches, DRAG

HANDS RESET button, and NEUTRAL LIGHT are standard.

NEUTRAL LIGHT will light to indicate that the regulator is in the neutral position,

for those regulators equipped with a circuit for this purpose.

The M‑2279D also includes an Input Voltage Circuit Breaker and Backup Alarm

Indicator.

Options

SCADA Cutout switch allows the local blocking of SCADA commands (for use with

SCADA enabled M‑2001C controls). Use of the SCADA Cutout Switch with the

M-2001C, requires a M-2001C Control with firmware version D‑0146V08.01.22

or later installed.

SCAMP™ (SCADA Controlled AUTO/MANUAL Pushbutton) switch allows the Auto/

Manual state on the adapter panel to be changed by a SCADA command.

Use of the SCAMP pushbutton with the M‑2001C, requires a M-2001C Control with

firmware version D-0146V08.05.XX or later installed.

Voltage Reduction (VR1/OFF/VR2) switch allows Local Voltage Reduction 1 or 2 to

be initiated.

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.

Environmental

Temperature Range: Functionality is maintained from –40° to +85° C.

Humidity: Functionality is maintained under 95% relative humidity (non‑condensing).

Fungus Resistance: A conformal printed circuit board coating inhibits fungus growth.

Physical

Size : 17" high x 15‑1/16" wide x 9‑7/8" deep (43.2 cm x 38.3 cm x 25.1 cm)

Approximate Weight: 11 lbs, 13 oz (5.4 kg)

Approximate Shipping Weight: 14 lbs, 13 oz (6.7 kg)

Approximate Weight with M‑0329B Option: 15 lbs, 13 oz (7.2 kg)