Message 28102 in TECH.WW
From: G8MNY
Date: Mon, 17 Aug 26 06:39:00 Z
Newsgroups: TECH.WW
Subject: Rotator Yamato YB101 info
Message-ID: <2471_GB7CIP>
Path: K7EK|DK0WUE|PI8ZTM|CX2SA|ED1ZAC|GB7CIP
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From: G8MNY@GB7CIP.#32.GBR.EURO
To : TECH@WW
By G8MNY (Updated Jul 19)
(8 Bit ASCII graphics use code page 437 or 850, Terminal Font)
This is quite a complex circuit design with 2 relays and uniquely it is only a
3 wire system for proper comparison pot type controller.
_.-'.- ' " `;_ _.-' | / \
.-' \__ . -'/_/.-' | 3 Wire (__________) ROTATOR
DIAGRAM
SU-2000A PCB
o = PCB Connection * = External Connection
ROTATOR DIAGRAM
OPERATION
After rotating the HEADING pot to the desired direction and 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 and turns on Q2 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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