    [Rectifier Ra-36-J,k,l]
    [From the U.S. Government Publishing Office, www.gpo.gov]

    ______________
    £V/. //~ Document
    Reserve
    WAR DEPARTMENT TECHNICAL MANUAL
    NON-CIRCULATING
    RECTIFIER
    RA-36-J, K, L
    WAR DEPARTMENT 8 JUNE 1943
    NTsU LIBRARY

    WAR DEPARTMENT TECHNICAL MANUAL
    T M 11-951
    RECTIFIER
    RA-36-J, K, L
    WAR DEPARTMENT • 8 JUNE 1943
    For Sale by Superintendent of Documents, U. S. Government Printing Office, Washington 25, D. C.
    Price 10 Cents

    TECHNICAL MANUAL TM 11-951
    NO. 11-951
    RECTIFIER RA-36-J, K, L
    CONTENTS
    PARAGRAPH
    SECTION I. DESCRIPTION
    General....................................................................................... 1
    Power .......................................................... ,.............. 2
    Output.................. :................................................................ 3
    List of Component Parts.................................. 4
    SECTION II. INSTALLATION AND OPERATION
    Initial Procedure............... ................. ...................... 5
    Installation.................................... 6
    Preparation for Use................................................................... 7
    Electrical Connections................................................ 8
    Battery Connections................................... ............................. 9
    Operation ................ 10
    If Bulbs Do Not Light................................................................. 11
    SECTION III. FUNCTIONING OF PARTS
    Control Boards....................... 12
    Power Transformer........................... 13
    Filter Reactance Coil......... ....................................................... 14
    SECTION IV. MAINTENANCE
    Upkeep ....................................................................................... 15
    SECTION V. SUPPLEMENTARY DATA
    Table of Replaceable Parts....................................................... 16
    Page 1
    SIGNAL CORPS TM 11-951
    LIST OF ILLUSTRATIONS
    PAGE
    Fig. 1. Exterior View of Rectifier RA-36-(*).............................. 3‘
    Fig. 2. View of Rectifier RA-36-(*) with Cabinet Door Open
    Showing Interior................................................................. 4
    Fig. 3. Back View of Rack FM-30 Showing Filter Reactance and
    Cabinet BE-75..................... 6
    Fig. 4. Rectifier RA-36-(*) Circuit Diagram.......................... 9
    DESTRUCTION OF ABANDONED MATERIAL
    IN THE COMBAT ZONE
    In case it should become necessary to prevent the capture of this
    equipment, and when ordered to do so,
    DESTROY IT SO THAT NO PART OF IT CAN BE SALVAGED,
    RECOGNIZED OR USED BY THE ENEMY. BURN ALL PAPERS
    AND BOOKS.
    BY:
    1. Explosives, when provided.
    2. Hammers, axes, sledges, or whatever heavy objects are readily
    available.
    3. Burning with gasoline, oil, paper, or wood.
    4. Grenades and shots from available arms.
    PROCEDURE:
    1. Obliterate all identifying marks. Destroy nameplates and
    circuit labels.
    2. Demolish all panels, castings, switch- and instrument-boards.
    3. Destroy all controls, switches, relays, connecting means and
    meters.
    . 4. Rip out all wiring in electrical equipment. Smash water-cooling,
    gas and oil systems in gas-engine generators, etc.
    5. Smash every electrical or mechanical part whether rotating,
    moving or fixed.
    6. Break up all operating instruments such as keys, phones,
    microphones, etc,
    7. Destroy all classes of carrying cases, straps, containers, etc.
    DISPOSAL:
    1. Where possible, and when time permits, bury all debris or dispose
    of it in streams or other bodies of water.
    SAFETY NOTICE
    Operation of this equipment involves the use of voltages which are
    dangerous to life. Operating personnel must observe all safety regulations
    at all times. Do not change fuses or make adjustments inside
    of equipment with voltage supply on. Keep away from live circuits.
    Page 2
    TM 11-951 RECTIFIER RA-36-1*) PARAGRAPH 1
    SECTION I. DESCRIPTION
    1. General
    Rectifier RA-36- (*) is a compact charging unit for charging tele- .
    phone switchboard storage batteries. It may also be used for charging
    vehicle storage batteries. The rectifier has two separate charging
    circuits, one on the right and one on the left. Each of the two charging
    circuits has separate ammeter and control boards as shown in
    Figure 2.
    RECTIFIER RA-36-JRACK FM-30j
    EffiEEjga lOhL—- A-G PLUGjl
    UWOMT Rny BE-75
    i Hi wjf ® III I %
    ylN B ™|I
    FILTER REACTANCE .3
    4? . ....... v ......................... . .
    Figure 1—Exterior view of Rectifier RA-36-C*)
    (*) Wherever this sign is used the equipment will be issued with
    suffix letters J, K or L.
    Page 3
    PARAGRAPHS 2-4 SIGNAL CORPS TM 11-951
    MOUNTING
    15 AMPERE FUSE
    BRACKET
    TUNGAR
    BULBS
    AMMETERS
    COURSE
    ADJUSTMENT
    PLUGS
    BOARD
    AC PLUG
    AC CONTROL
    SWITCH
    Figure 2—View of Rectifier RA-36-(*) with cabinet door open, showing interior
    2. Power
    Rectifier RA-36-(*) is designed to operate from 110-volt, 60-cycle,
    single phase, alternating current.
    3. Output
    Each of the sections or sides of Rectifier RA-36- (*) has an output
    of 6 amperes (half wave) and because both sections are fed from
    the same transformer, they are used simultaneously to give 12 amperes
    of full wave direct current for battery charging service.
    4. List of Component Parts
    Rectifier RA-36-(*) includes the following major components:
    2 Ammeters Weight .25 lb. each
    2 Bulbs, Tungar 6 amp. Weight .4 lb. each
    1 Capacitor Weight .3 lb. each
    Page 4
    TM 11-951 RECTIFIER RA-36-1*) PARAGRAPHS 4-8
    2 Fuses, 15 amp.
    1 Fuse Block
    2 Plugs, Fine Adjuster
    2 Plugs, Coarse Adjuster
    2 Plugs, Boards
    1 Filter Reactance
    1 Receptacle and Cap
    1 Switch
    1 Power Transformer
    1 Terminal Board
    2 Sockets
    The weight of Rectifier RA-36
    Weight .2 lb. each
    Weight .5 lb. each
    Weight .05 lb. each
    Weight .05 lb. each
    Weight .3 lb. each
    Weight 63.5 lbs. each
    Weight .4 lb. each
    Weight .02 lb. each
    Weight 60.00 lbs. each
    Weight .06 lb. each
    Weight .25 lb. each
    (*) is82pounds.
    SECTION II
    INSTALLATION AND OPERATION
    5. Initial Procedure
    If Rectifier RA-36-(*) is to be used as a separate unit, it will be
    packed in an individual packing case. Remove it carefully. Avoid
    damaging the instruments and Tungar charging bulbs which are
    included in the unit package. Take bulbs out as soon as possible and
    lay them aside carefully to prevent breakage.
    6. Installation
    Select a clean dry place (not over batteries) for installing, preferably
    on a wall or bench and away from dirt, moisture and battery
    fumes. If a wall is selected as a location, first drive two No. 12 screws
    into a solid point at the same height as the keyhole slots in the mounting
    bracket at the top and back of the rectifier cabinet. Insert a third
    screw at the bottom and in the place provided for it. Install the filter
    reactance coil close to Rectifier RA-36-(*) and in series with d-c
    charging leads. When Rectifier RA-36-(*) is assembled on Rack
    FM-30, the filter reactor and Cabinet BE-75 are also mounted on
    the same rack. This assembly is in itself a complete charging unit
    with circuit breakers for overload protection. Rack FM-30 is also
    provided with Case CS-73 (a sturdy shipping container for transportation
    between points of service). When Case CS-73 is set in
    position for service, expose the equipment for use by first removing
    the slotted hexagon head machine screws on two sides and near the
    bottom of the case. Then lift the cover upward and clear of the apparatus,
    leaving Rack FM-30 mounted on the base of Case CS-73. The
    cover can then be used as a table or support to raise the equipment to
    a level convenient for operation.
    7. Preparation for Use
    Before making any electrical connections, be sure that the a-c
    supply circuit to which the rectifier is to be connected is 105 to 125
    volts, 60-cycle, single phase as shown on the rectifier name plate.
    8. Electrical Connections
    If you are sure that a-c supply and name plate are in agreement,
    plug the a-c line connection, which is a rubber covered 2-conductor
    cord (with two-prong male plug) extending from the right hand
    side of Rectifier RA-36-(*), into Cabinet BE-75. Plug the d-c charging
    lead which is a rubber covered 2-conductor cord (with two-prong
    Page 5
    PARAGRAPHS 8-9 SIGNAL CORPS TM 11-951
    male plug) extending from the left hand side of Rectifier RA-36-(*)
    into the charging receptacle provided on the power panel of Switchboard
    BD-90 or on Switchboard BD-98. Test the tightness of the fuses
    used on Rectifier RA-36-(*) (which are 15 ampere and are located
    as shown on Figure 2) and be sure that they are firmly screwed in
    place. Adjust the tap on the primary control board (see Figure 2)
    to agree with the voltage of the a-c supply line. To reach the primary
    control board, open the door on the front of the rectifier. The door
    is held in the closed position by a spring fastener on the right hand
    side. Screw both Tungar bulbs firmly into the large sockets and
    attach connecting leads with clip to the wires on the top of the bulbs.
    9. Battery Connections
    a. Before attaching charging leads to batteries, turn the rectifier
    switch to OFF and remove all four adjustment plugs. Insert the
    coarse adjustment plugs on both sides of the rectifier in the holes
    numbered to correspond with the voltage of the battery to be charged
    divided by six. Thus the setting for a 24-volt battery would be No. 4
    hole and for a 48-volt battery would be No. 8 hole. These figures indicate
    the number of equivalent 6-volt, 3-cell batteries. Be sure that
    the plugs are pushed in as far as they will go. Battery equipment for
    Switchboard BD-98 is 24 volts. .Battery equipment for Switchboard
    BD-90 is 48 volts.
    CIRCUIT BREAKERS’’*’*^^ RA-36'j’^W
    iH7 i \ । ■
    \ / J : I
    ... Ha-c plug Ml
    ’ I I
    SCX BE-75
    FILTER REACTANCE |||- Rff Ih^SmI B ' ** ^1 «■''
    f I zzIJa imi
    B |UM|Kfi||M^| M%3i
    Hr IBFwrr-
    ...........
    Figure 3—Back view of Rack FM-30 showing filter reactance and Cabinet BE-75
    Page 6
    TM 11-951 RECTIFIER RA-36-(*) PARAGRAPHS 9-12
    NOTE: THE FINE ADJUSTMENT PLUGS ARE NOT INSERTED
    AT THIS POINT.
    . b. Check the following:
    (1) The control switch is turned OFF.
    (2) Both bulbs are screwed firmly into the sockets.
    (3) The connecting leads with clips are attached to the wires on
    top of the bulbs.
    (4) The fuses have been inserted.
    (5) The coarse adjustment plugs are inserted in the proper hole
    as far as they will go.
    10. Operation
    After making sure that neither fine adjustment plug has been
    inserted, snap the control switch to ON and both the bulbs should
    light. If both bulbs light, insert the fine adjustment plugs in the
    holes marked LOW. (See paragraph 11 below for procedure to follow
    if bulbs do not light.) The charging rate of the right hand circuit
    will be indicated by the ammeter on the right, and the charging rate
    of the left hand circuit by the meter on the left. If the charging rate indicated
    on an ammeter is less than one-half of the desired charging
    rate, first turn off the control switch and'move the fine adjustment
    plug of its associated circuit, which is on the same side, to MEDIUM
    or if necessary to HIGH. If still unable to obtain a charging rate as
    high as desirable, but less than 6 amperes as indicated on each ammeter,
    turn off the control switch and move both coarse adjustment
    plugs to the hole of the next higher number, and proceed as before.
    Normal operation is established when both ammeters read one-half
    of the desired charging rate, and no excessive ripple or hum is caused
    in the telephone circuits.
    RATES HIGHER THAN 6 AMPERES PER CIRCUIT SHOULD
    NOT BE USED AS THIS PRACTICE WILL MATERIALLY REDUCE
    THE LIFE OF THE BULBS.
    11. If Bulbs Do Not Light
    If when turning on the control switch, the bulbs do not light proceed
    to find the cause as follows:
    a. See that the a-c supply is on.
    b. Examine the line supply fuses. If these are blown out or defective,
    replace them with new 15 ampere fuses.
    c. Make sure that the bulbs are screwed well into the sockets. A
    bulb screwed in loosely often causes trouble and may result in short
    life of the bulb.
    d. Examine the contacts inside the socket. If they are tarnished or
    dirty, clean them with sandpaper.
    e. Try a new bulb if one fails to light. The old bulb may be defective.
    SECTION III
    FUNCTIONING OF PARTS
    12. Control Boards
    One control board on each circuit is for coarse adjustment of the
    charging rate and one for fine adjustment of the charging rate. Both
    coarse and fine adjustments are made by means of inserted plugs as
    indicated on Figure 2. '
    Page 7
    PARAGRAPHS 13-15 SIGNAL CORPS TM 11-951
    13. Power Transformer
    a. The power transformer used in Rectifier RA-36-(*) is of the
    insulated type; that is, the primary and secondary windings are entirely
    separate and insulated from each other. The advantage of the
    use of such an insulated transformer is that a telephone battery can
    be charged while it is being used to operate a telephone system or
    switchboard without interfering ground connections being introduced
    by the charging equipment.
    b. The power transformer primary winding is provided with taps
    to compensate for fluctuations in a-c line voltage. These taps are
    indicated on Figure 4 showing proper tap for operation on 105,115,
    and 125 volt lines.
    14. Filter Reactance Coil
    Because of the fact that rectified alternating current does not
    have a straight line characteristic and would cause a disturbing hum
    in telephone circuits if applied to a telephone battery while battery
    was being used for the operation of telephone equipment, a filter
    reactance coil is installed in series with the d-c charging lead to
    absorb hum or ripple. '
    SECTION IV. MAINTENANCE
    15. There are no continuously moving parts in Rectifier RA-36-(*).
    Therefore, no routine care is required other than that of keeping the
    equipment clean and dry, replacing burned out fuses and bulbs and
    repairing damage caused by accident. Other than this, the equipment
    will most likely have to be returned to higher echelon for repair if
    it goes bad. Field repair or replacement of the transformer is not
    practicable.
    Page 8
    TM 11-951 RECTIFIER RA-36-(*) FIGURE 4
    TAPED OVER
    TAP FOR USE
    ON 40 V
    CIRCUIT
    FUSES -15 AMP
    BULB CAT. 189049 BULB CAT. 189049
    PLUG BOARD
    END
    START
    PLUG
    BOARD
    AMMETER
    TYPE 0-7
    AMMETER
    TYPE 0-7
    SINGLE
    CONNECTOR
    [TAPED OVER)
    END
    STAR!
    SEC. ST.
    FIG. 6 CONNECTIONS OF 115 VOLT TUNGAR
    FOR TELEPHONE BATTERY CHARGING
    I CAPACITOR 2 MFD
    - CAT. 55X185
    D.P.S.T.
    SWITCH
    CAT. 235685
    ST. if
    END
    ST.
    END
    Figure 4—Rectifier RA-36-(*| circuit diagram
    Page 9
    PARAGRAPH 16 SIGNAL CORPS TM 11-951
    Function
    Filter out ripple in
    charging current
    2 element rharoincr — ---------
    tube
    Voltage supply
    Bulb protection
    Batterv rharorinor
    connection
    Charge rate control
    Charge rate control
    DATA
    Part or
    Mfg. No.
    Cat.
    3126680
    Cat.
    189049
    Cat.
    yy3i6
    Cat.
    55X185
    Cat.
    489353
    Cat.
    44815478
    Cat.
    55X151
    f>t-
    <
    Z
    Mfgr.
    G. E. Co.
    G. E. Co.
    •
    G. E. Co.
    G. E. Co.
    G. E. Co.
    G. E. Co.
    G. E. Co.
    ON V. SUPPLEME
    Description
    Heavy coil on iron core
    enclosed
    Glass bulb with screw
    base—6 amperes
    Tapped coil on iron core
    —open type
    Metal case capacitor—2
    microfarad—330 V.A.C.
    Bakelite strin
    Bakelite plug panel—
    15 plug holes
    Metal plug with chain—
    Bakelite handle—fine
    adjustment
    SECTI
    laceable Parts
    Name of Part
    Filter Reactance
    Tungar Bulb
    Power Translormer
    Capacitor
    Terminal Board
    Plug Board
    Plug
    16. Table of Rep
    Sig. Corps
    Stock No.
    -
    Page 10
    TM 11-951 RECTIFIER RA-36-C*) PARAGRAPH 16
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