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Hubbell BECKWITH ELECTRIC M-2278 Application Manual

Adapts m‑2001 series digital tapchanger control as a replacement for allis-chalmers surface-mount ltc transformer controls
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Application Guide
M‑2278 Adapter Panel
A proud member of the Hubbell family.

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Summary of Contents for Hubbell BECKWITH ELECTRIC M-2278

  • Page 1 Application Guide M‑2278 Adapter Panel A proud member of the Hubbell family.
  • Page 2 TRADEMARKS All brand or product names referenced in this document may be trademarks or registered trademarks of their respective holders. The content of this Instruction Book is provided for informational use only and is subject to change without notice. Beckwith Electric has approved only the English version of this document.
  • Page 3 CONTROLS Adapter Panel M‑2278 Adapts M‑2001 Series Digital Tapchanger Control as a Replacement for Allis‑Chalmers Surface‑Mount LTC Transformer Controls • Connects easily to the M‑2001 Series Digital Tapchanger Control using mounting screws and 24‑pin connector • Provides direct mechanical replacement of Allis‑Chalmers surface‑mount LTC transformer controls •...

  • Page 4: Warranty

    Specification subject to change without notice. BECKWITH ELECTRIC 6190 118th Avenue North • Largo, Florida 33773-3724 U.S.A. PHONE (727) 544-2326 beckwithelectricsupport hubbell.com www.beckwithelectric.com ISO 9001:2015 A proud member of the Hubbell family. M‑2278‑SP‑04 11/23 © 1994 Beckwith Electric. All Rights Reserved.
  • Page 5 WARNING DANGEROUS VOLTAGES, capable of causing death or serious injury, are present on the external terminals and inside the equipment. Use extreme caution and follow all safety rules when handling, testing or adjusting the equipment. However, these internal voltage levels are no greater than the voltages applied to the external terminals.

  • Page 6: Product Cautions

    PRODUCT CAUTIONS Before attempting any test, calibration, or maintenance procedure, personnel must be completely familiar with the particular circuitry of this unit, and have an adequate understanding of field effect devices. If a component is found to be defective, always follow replacement procedures carefully to that assure safety features are maintained.

  • Page 7: Table Of Contents

    TABLE OF CONTENTS M-2278 Adapter Panel Application Guide Introduction ......................1 Description ....................... 1 Standard Features....................1 Installation ........................ 1 Installation of the M-2001 Tapchanger Control ............1 Installation of the M-2278 Adapter Panel ..............2 Lightning Protection ....................2 Application ........................
  • Page 8 Bench Test ......................10 Resistance ......................11 Reactance ......................11 Paralleling ......................11 Voltage Source Switch ................... 11 Drag Hands Reset ....................11 Counter/Neutral Light Tap Position ................. 11 Figure 7 M-2278 Test Procedure External Connections ......... 12 Block Raise/Block Lower/Deadband ............... 13 M-2001 Checkout Procedure ..................

  • Page 9: Introduction

    M‑2278 Application Guide b. VOLTAGE IN binding posts on the Introduction front panel allow application of a 120 V rms nominal voltage to the unit for The Beckwith Electric M‑2278 Adapter Panel, test procedures. used in conjunction with the M‑2001 Series Digital c.

  • Page 10: Installation Of The M-2278 Adapter Panel

    M‑2278 Application Guide Installation of the M‑2278 Adapter Panel The external connections for the M‑2278 are Mount the M‑2278 Adapter Panel (with the M‑2001 made to terminal block TB3 located at the top of Series Digital Tapchanger Control) onto the hinges the adapter panel.
  • Page 11 M‑2278 Application Guide Figure 1 Outline Dimensions 9/32 (0.71) DIA – 4 Places C C L L (20.3) 3-7/8 (9.8) Inches (Centimeters) 11 (27.9) Figure 2 M‑2278 Hole Drill Dimensions –3–...
  • Page 12 M‑2278 Application Guide Allis-Chalmers Designations CIRCULATING CURRENT (RETURN) CIRCULATING CURRENT (POLARITY) REGULATED VOLTAGE (120 V AC) LINE CURRENT (POLARITY) LINE CURRENT (RETURN) NEUTRAL Remove jumper to isolate the NON-SEQUENTIAL OPERATION / return side of the AUTO TAPCHANGE INHIBIT INPUT MOTOR POWER line current DISABLE VOLTAGE REDUCTION STEP #2 INPUT...

  • Page 13: Auto Disable Input

    M‑2278 Application Guide Auto Disable Input Paralleling To disable automatic operation of the M‑2278, The tapchanger controls are equipped for use in remove the jumper between TB3‑12 and TB3‑13. If systems requiring the paralleling of two or more SCADA is used to enable and disable this function, regulators or LTC transformers.

  • Page 14: Operations Counter Input

    M‑2278 Application Guide For further information on this topic, obtain Beckwith The M‑0329 LTC Backup Control is connected as Electric Application Notes #11, “Introduction to a two terminal device to the voltage transformer. Paralleling of LTC Transformers by the Circulating Figure 3‑4 shows the typical interconnection of the Current Method,”...
  • Page 15 M‑2278 Application Guide M-2001 M-2278 TAPCHANGER ADAPTER PANEL CONTROL FUNCTIONS NON-SEQUENTIAL / AUTO TAPCHANGE INHIBIT INPUT FUNCTIONS VOLTAGE REDUCTION STEP #2 CONTACT TO PARALLELING UNIT MOTOR VOLTAGE REDUCTION MANUAL RAISE STEP #1 CONTACT OFF (MOM) MANUAL LOWER NEUTRAL (MOTOR RETURN) EXTERNAL MOTOR POWER MOTOR IN...
  • Page 16 M‑2278 Application Guide DRAG HANDS RESET OPERATIONS COUNTER INPUT AUTO DISABLE TAPCHANGER LOWER OUTPUT TAPCHANGER RAISE OUTPUT MOTOR POWER 120/240 V AC SUPPLY MOTOR POWER DISABLE (LOCAL/REMOTE) NEUTRAL LINE CURRENT (RETURN) LINE CURRENT (POLARITY) REGULATED VOLTAGE (120 V AC) CIRCULATING CURRENT (POLARITY) CIRCULATING CURRENT (RETURN) NEUTRAL LIGHT VOLTAGE REDUCTION...
  • Page 17 M‑2278 Application Guide MOTOR SUPPLY Tapchanger Control M-0329 LTC Backup Control TB1-11 120 V ac LOWER Raise Power TB1-12 TB1-6 Common Voltage RAISE TB1-7 Lower TB1-9 Alarm LOWER TB1-10 Limit switcher, auxiliary contacts as required in motor control circuits. 84R - Raise Motor Auxiliary Relay 84L - Lower Motor Auxiliary Relay * ...

  • Page 18: M-0329 Ltc Backup Control Settings

    M‑2278 Application Guide Set‑up Procedure M‑0329 LTC Backup Control Make the electrical connections as Settings shown in Figure 5‑1.  NOTE: There is a one second delay between The BANDCENTER and BANDWIDTH dials on the out‑of‑band condition and panel LED the M‑0329 LTC Backup Control should be set indication.

  • Page 19: Resistance

    M‑2278 Application Guide Resistance Voltage Source Switch Apply 100.0 mA in‑phase current to Set AUTO/OFF/MANUAL switch to OFF. TB3‑4 (load current‑polarity) and TB3‑5 Set VOLTAGE SOURCE switch to EXT. (load current‑return) of the adapter panel. (Set S to LDC and S to I Verify that there is no manual RAISE or LOWER output.
  • Page 20 M‑2278 Application Guide Figure 7 M‑2278 Test Procedure External Connections –12–...

  • Page 21: Block Raise/Block Lower/Deadband

    M‑2278 Application Guide Block Raise/Block Lower/Deadband In‑Service Test Set Block Raise to 126.0 V. Set Block Lower to 114.0 V. Set the M‑2001 Series Digital Tapchanger Control to display the Bias Voltage Set the M‑2001 Series Digital Tapchanger screen. Control to display the Bias Voltage screen.
  • Page 22 M‑2278 Application Guide As shown in Figure 8, temporarily ▲ CAUTION: Do not reverse the ground and hot place a shorting device across the wires when connecting an external source. A 3 LDC‑CT secondary to short the line drop AG fuse (F2) is installed to protect the relay from compensator circuit, and place another damage if these connections are accidentally shorting device across TB3‑1 and TB3‑2...

  • Page 23: Voltage Source Switch

    M‑2278 Application Guide Voltage Source Switch Maintenance The VOLTAGE SOURCE switch will disconnect all Due to the nature of the circuitry in the M‑2001 power from the unit when in the EXT position with Series Digital Tapchanger Control, field repair is no source connected to the front panel voltage and not recommended.
  • Page 24 M‑2278 Application Guide This Page Left Intentionally Blank –16–...
  • Page 25 The units described in this manual are covered by The Seller shall not be liable for any property U.S. Patents, with other patents pending. damages whatsoever or for any loss or damage arising out of, connected with, or resulting from this Buyer shall hold harmless and indemnify the Seller, contract, or from the performance or breach thereof, its directors, officers, agents, and employees from...
  • Page 26 This Page Left Intentionally Blank...
  • Page 28 BECKWITH ELECTRIC 6190 118th Avenue North • Largo, Florida 33773-3724 U.S.A. PHONE (727) 544-2326 beckwithelectricsupport hubbell.com www.beckwithelectric.com ISO 9001:2015 © 1994 Beckwith Electric. All Rights Reserved. M-2278-AG-04 11/23...

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