Using the M‑0115A with Existing Equipment

The M‑0115A Parallel Balancing Module can be ordered with new equipment from

most transformer manufacturers or added to existing transformers. If the Module is

added to existing equipment, the following factors should be considered:

• If the old control uses a 5 A input for the line drop compensator, a new control must

be installed to provide the required 0.2 A load and circulating current inputs.

A Beckwith Electric M‑2001C/D Tapchanger Control is recommended for this application.

• The M‑0115A is designed for use with 200 mA = 1 P.U. system currents. If only 5 A

currents are available, then a suitable 5 A:0.2 A Auxiliary Current Transformer, such as

the Beckwith Electric M‑0169A, is recommended.

• If phase‑to‑phase voltage is used, two current transformers are used to derive a

current in phase with the voltage. Connection must be made to Terminal 5 of the M‑0169A

instead of Terminal 1.

Only required with M‑0067E, M‑2001C/D have a Phase Angle Correction Setting for this

condition.

• Refer to the paralleling diagrams in the LTC Comprehensive System Manual for the

following conditions:– If circuit breakers such as the “52 Line Breaker(s)” and the “24

Tie Breaker(s)” as shown in the paralleling diagrams are present, then their auxiliary

contact connections should be included as shown to ensure proper automatic transfer

from parallel to independent operations. Please note that auxiliary breaker contacts

are shown in the parallel mode with all breakers closed.

– If these breakers do not exist, and for example, only one common load breaker is

used, the circuit should be wired to make a circuit where the normally closed contacts

are shown. No circuit should be made where the normally open contacts are shown.

• If paralleling and hand‑operated load switches are used:

a. AUTO/MANUAL switches on the M‑2270. M‑2278. M‑2280. and other Beckwith

Electric adapter panels should be placed in the MANUAL position.

b. Other controls should be placed in the MANUAL position.

c. The M‑0115A PARALLEL/ INDEPENDENT switch should be placed in the

INDEPENDENT position before the load switches are operated (see CAUTION).