• Rotator Yamato YB101 info

    From G8MNY@21:5/101 to TECH on Fri Jul 12 05:10:10 2019
    R:190712/0718Z @:LW2DQC.1653.BA.ARG.SOAM #:14098 [14103] FBB7.01.35 alpha R:190712/0717Z @:LW3DBH.1744.BA.ARG.SA #:39201 [MORENO] FBB7.00i $:12114_GB7CIP R:190712/0705Z @:LU4ECL.LP.BA.ARG.SOAM #:5025 [La Plata] FBB7.0.8-beta2 R:190712/0705Z 4540@I0OJJ.ITA.EU [Rome] $:12114_GB7CIP
    R:190712/0703Z @:GB7CIP.#32.GBR.EURO #:12114 [Caterham Surrey GBR]

    From: G8MNY@GB7CIP.#32.GBR.EURO
    To : TECH@WW

    By G8MNY (New Nov 05)
    (8 Bit ASCII graphics use code page 437 or 850, Terminal Font)

    This is quite a complex circuit design with 2 relays & uniquely it is only a 3 wire system for proper comparison pot type controller.

    (=║\ Stub Mast
    ║ │ Clamp Castings
    _.---------------. __(=║_│_
    _.-'.- ' " `;_ _.-' | / \
    .-' \__ . -'/_/.-' | 3 Wire (__________) ROTATOR ├──────────────┐-" _.:| Cable │________│
    │ │ _..-:'-'" │ ║=) └ option flat └──────────────┴:'-"' Support │ ║ base plate
    CONTROLLER Mast Clamp \║=) unbolt clamp

    DIAGRAM
    ┌─────o───────────────────────────────────────────────────┬──────* 2
    RUN ║( red 2 MOTOR & │
    r┌o/ o┐r ║( FLOATING │
    │ __ │w ║( 27V BRIDGE │
    N┴o o┴─┐║( red 1 SUPPLY │
    START )║└─────o────────────────────────────────────────┬──────────)────┐
    )║ +┌──┬─────────┬────┬─────┐ R3 R2 │
    240V )║┌────o────┬───┐ │ R2 │ R5 │ 10k 1k │
    )║( bl 3 │ │ │ 1k │ 2M2 │ │/ │ │
    1A r )║( _│_ _│_ │ o │ ├─────)───┤ _│_ │ L──o─o──┘║(12-0-12V/_\ \_/ │ │rd │ _│_ │ │\e /_\D9 │
    Fuse ║(__o4 -│D4 │+ │ _│_LED │ \_/D2 │ _│_D1 │ │
    ║( │Ye ┌──┤ -7├──┤ \_/ │ _│_D3 │ \_/ VR1 │ │
    ║( │ │ _│_ _│_ │ │bn Q3│ \_/ 7│ 2 │ ┌──3k3─┤ │
    ║( │ 5 │ \_/ /_\ │ o NPN\│__│ 6 ,/'├────┤ CONTROL _│_ZD1│
    └──)─o─)──┴───┘ │ │ _____ e/│ ├──<741│ 3 │ POT \_/, │
    bl │ │ │ ├─┤ RUN ├─┤ │ `\.├─┬──)─>10k ~│~ │
    │ │ │ │ │RELAY│ e\│__├─┤├──)──┤ │ └──3k3─┤ │
    │ │ │ │ └─────┘ /│ 3n3 │4 │ │ VR2_│_D8 │
    │ │ - │ │ PNP│ Q4 │ │ │ /_\ │
    │ ├─────────)──)─────────┴──────────┘ │+ │ │ │
    │ ===C2 C3=== │ C4 === │ R1 1k │
    │ +│10u 10u│- │ 4u7 │ │ └────┴* 1
    └───┴─────────┴──┴───────────────────────┴──┴────────────────* 3
    SU-2000A PCB
    o = PCB Connection * = External Connection

    ROTATOR DIAGRAM
    2 *─┬────────────┬──────────┬────┐
    1k _______│_______ │+ │
    _│_ │DIRECTION RELAY│ === │
    /_\ └───────┬───────┘ │10u │
    │ ├──────────┘ │
    │ _│_ │
    │ \_/ │
    ├────┐ │ │
    _│_ ROT │/ AC ┌─────┴──┐
    \_/, POT<─┬─┤ MOTOR )|| ||(
    ~│~ 10k │ │\e 2x 8Ω )|| ||(
    ├────┘ │ _│_ )|| ||(
    _│_ │ \_/ )|| ||(
    /_\ │ │ │ │
    │ │ │ ┌────┤ 50V AC │
    1k │ │ o === 68uF │
    1 *─┴────────)───┴─./'o____│________│
    3 *──────────┘ Relay

    OPERATION
    After rotating the HEADING pot to the desired direction & pressing the START button the LED is lit from the +ve rail & the RUN relay operates holding the mains on, as the bridge will be off balance & either + or - from the opamp will via Q2 or Q3 will hold the RUN relay on until a balance is reached.

    When the op amp output is high Q1 is turned on putting some DC unbalance on the motor feed. This is sensed during the bridge unpowered half cycle in the motor head unit & turns on the transistor to operate the DIRECTION relay. The DIRECTION relay determines the AC phase & hence direction of rotation of the 2 pole AC motor.

    Preset pots VR1 & VR2 set the end scale length for the control pot to match the rotator pot.

    FAULTS
    I have experienced the 4 white blob type diodes in the rotator head unit falling apart with corrosion, despite the rest of the circuit being in clean condition.


    Why Don't U send an interesting Bul?

    73 de John G8MNY @ GB7CIP

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    * Origin: HAMRADIO telnet lu9dce.dynu.com (21:5/101)