Beckwith Electric M-2379 Adapter Panel

Adapts M‑2001 Series Digital Tapchanger Control to Replace Pennsylvania

Transformer and McGraw‑Edison 110. 220. 220A, 550 and 550B

Type LTC Transformer Controls Produced Before 1963

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

mounting screws and 24‑pin connector

• Provides direct mechanical replacement of the existing LTC transformer

control using the same two knurled knobs from the existing control

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

Tapchanger Control is removed.

The M‑2379 is an adapter panel which, when combined with the M‑2001

Series Digital Tapchanger Control, provides convenient direct replacement

for the following Pennsylvania Transformer and McGraw‑Edison LTC

transformer controls manufactured before 1963: 110. 220. 220A, 550 and

550B.

Interface

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

panel of the M‑2379B and 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 two knurled knobs must be saved from the existing

control cabinet.

Features

Separate fuses for test terminal, voltage sensing and motor power are 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 90 BACK UP

ALARM will light to indicate that the optional M‑0329B LTC Backup Control is

blocking any M‑2379B commands. MOTOR POWER button allows resetting

of the motor power circuit VOLTAGE BREAKER button allows resetting of the

voltage circuit breaker. HEATER SWITCH turns the heater on and off

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: 22" high x 17" wide x 4‑3/8" deep (55.9 cm x 43.2 cm x 11.1 cm)

Approximate Weight: 6 lbs, 8 oz (3.0 kg)

Approximate Shipping Weight: 9 lbs, 8 oz (4.3 kg)

Approximate Weight with M‑0329B Option: 10 lbs, 8 oz (4.8 kg)

Approximate Weight with M‑2001 Series Digital Tapchanger Control: 10 lbs, 3 oz (4.6 kg)

Approximate Shipping Weight with M‑0329B Option: 13 lbs, 8 oz (6.1 kg)

Warranty

The M-2379 Adapter Panel is covered by a five year warranty from date of shipment.

Specification subject to change without notice.