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G8MNY  > TECH     09.10.18 08:15l 62 Lines 2985 Bytes #4 (0) @ WW
BID : 41036_GB7CIP
Subj: Rotator Hishmann Hit Ro 250 info
Path: ED1ZAC<ED1ZAC<IZ3LSV<IR2UBX<F1OYP<ON0AR<GB7CIP
Sent: 181009/0612Z @:GB7CIP.#32.GBR.EURO #:41036 [Caterham Surrey GBR]
From: G8MNY@GB7CIP.#32.GBR.EURO
To  : TECH@WW

By G8MNY                                       (New Jan 15)
(8 Bit ASCII graphics use code page 437 or 850, Terminal Font)

This is similar, but a simpler version of the Radio Shack offset rotator. This
one has no speed feedback electronics or pulsed cams etc!

                                              __  Stub Clamp
           _______________             Seal =³  ³=
        .-'            .-'\                \_³___³____
    _.-'.- _"  `;  _.-'  .->              /'        ]====)
 .-'   \__ . - ".-'   .-' /   3 Wire     ³         ³   Mast Clamp
/              /  _.-' _.-'    Cable     À¿         ]====)
ÃÄÄÄÄÄÄÄÄÄÄÄÄÄÄ´-' _.-'                   ÀÄÄÂÄÄÄÂÄÙ
\______________\.-'                         =³__³= Stub Clamp
     CONTROLLER                      ROTATOR

It uses 2 identical split phase AC squirrel cage motors, 1 in the rotator & 1
in the controller. In the controller as manual set friction dial is above motor
driven movable switch plate with 2 normally off changeover switches. The motor
runs until it agrees with the manually dial. The mains is fed via a flexible
lead to an off home mains contact & another lead with the secondary voltage to
a changeover to set the motor direction.

DIAGRAM
                          DIRECTION                   ROTATOR
               o¿            oÄÄÂÄÄÄÂÄÄÄÄÄ* 3 *ÄÄÄÄÄ¿ AC MOTOR
NÄoÄÄoÄÄÄÄÄoÄÄ> ÃÄÄ¿ ÚÄÄÄoÄÄ>   ³   ³               ())))Ä¿
  Fuse     NOT oÙ  )º(       o  ³  ===220uF         ===== ³
          HOME     )º( 16V   ³  ³   ³               ())))Ä´
        CONTACT    )º( 3A    ÀÄÄ)ÄÄÂÁÄÄÄÄÄ* 2 *ÄÄÄÄÄÙ     ³
                   )º(          ³  ³                 2x6ê ³
LÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÙ ³     _())))  ³                      ³
                     ³    ³ =====  ³                      ³
                     ³    ³_())))__³                      ³
                     ³    ³ DIAL AC                       ³
                     ³    ³  MOTOR                        ³
                     ÀÄÄÄÄÁÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄ* 1 *ÄÄÄÄÄÄÄÄÄÄÄÙ
   * = External Connection

The series AC capacitor gives a 90ø leading voltage into either of the windings
determining the direction of both motors. In the controller a chain of gears
turns the switch plate. In the rotator 1 gear & a worm drive gives the same
gear ratio to the well greased up stub mast champ tube from the motor. Both
motors need regular servicing to move grease around & stop rusting in the
outside rotator etc.

CALIBRATION
As the 2 motors AC are in different temperatures environments & with different
mechanical loads, they will go out of sync, To calibrate both they have to be
run into their mechanical stops at one or other end, to give time for the
unstopped one to catch up. They are both swinging stops to give a full 360ø.
Calibration should not be done often (once/10mins?) as 1 motor will be in a
stalled high current state for a while!


Why Don't U send an interesting Bul?

73 de John G8MNY @ GB7CIP


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