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G8MNY > TECH 07.07.09 07:46l 106 Lines 5830 Bytes #999 (0) @ WW
BID : 31118_GB7CIP
Read: GUEST
Subj: SIP2300 Generator info
Path: IZ3LSV<IK2XDE<DB0RES<DK0WUE<7M3TJZ<UA6ADV<GB7CIP
Sent: 090706/2243Z @:GB7CIP.#32.GBR.EU #:31118 [Caterham] $:31118_GB7CIP
From: G8MNY@GB7CIP.#32.GBR.EU
To : TECH@WW
By G8MNY (Updated Aug 08)
(8 Bit ASCII graphics use code page 437 or 850)
I bought a MEDUSA SIP2300 4 stroke petrol generators as the were so cheap (just
in case we have power cuts!). It is the same generator as the WOLF 2.3kW.
It is fairly quiet @ 73dBA @ 4m. The large 12 l tank gives approx 10 hours run
time. It is not too heavy @ 83kg full, 41kg dry, to move it by oneself (only on
& off a low level trolley & lift into van etc!).
Gauge Filler
ÜÜßßßßßßßßßßßßßßßÜÜ Û _.==ÄÄÄÄÄðððððÄÄÄÄÄÄ.._ Û Tube
Û/~~~~~~Tank~~~~~~~\Û Û/" Large 12L Tank "\Û Cage
Û-------------------Û Fuel Tap Û===========================Û
Û\_____________/~~~~Û & filter\Û|"""""~~~~~~~~~~~~~~~"""""|Û
Û Tap(0) ³elec Û STOPÛÞ [] øOK ³ on³ " AC " ÝÛ AC
ÛChoke // Sol\____Û SWITCHÛ |_ øOil³ º ³ = = = = _| Û 2x13A
ÛÚÄÄÄÄ¿ /~~~~~\\. ÛPull Û³~~""---..........---""~~³³Û
Û³In- ³,' /~~~\//\\ ÛStart Û³F ³ENGINE | | ³³Û
Û³Take³³ ³ ( ) ³ ³ Û Û³A ³ (=)oil ALT | ³³Û
ÛÀÄÄÄÄÙ \ \___/ / Û Û³N ³ _____³_³__|_____| ³³Û
Û Ú' ÚÄÄÄÄÄ¿ `¿ Û ÛÀÄÄÁÄÄÜÙ ÀÜÁÄÄÄÁÙÛ
ß"""""""""""""""""""ß ßßßßßßßßßßßßßßßßßßßßßßßßßßß
I have modified it for /P contesting, to power several 400W valve PAs for as
per my bul on "Petrol Gennys for /P SSB". With my rev up modification (add a
solenoid for FEED FORWARD compensation) the measured performance is now...
Generator Unmodified Modified
Load kW Volts Hz Volts Hz Uplift %
0 250 55 250 55 0
0.1 235 54 238 55 0.3
1.0 225 53 234 55 4
2.0 Rated 215 51 235 55 6.4
2.3 Old Peak 200 49 233 55 16.5
2.5 190 47 235 55 23.7
3.0 New peak 180 45 33% throttle 220 54 22.2 @ FULL THROTTLE!
It is not intended that continious loads over 2kW be used, just speech peaks
etc. to go to 3kW peak load. Before the modification it was not possible to
activate the 10A thermal output trip on good power factor loads, after this mod
it is now possable!
At 50Hz you only get 225V output, but it is more economical to use lower RPM if
the peak power is not needed! There is no 2 speed option for this, but a long
screwdriver will adjust it OK. Note the off load voltage is quite a bit higher
than even with a 100W lamp.
Other Mods I did were..
1/ Added earth bonding from engine, to frame, & to the electric panel plate.
2/ Added earth lead & earth clip for external earth stake.
3/ Added engine ignition lead screening, & made a screen tube for the plug cap.
4/ Painted Alternator casing black to imporve dissapation.
CIRCUIT
I have reverse engineered the diagram...
STOP
ÚÄÄÄÄÄÄÄÄÄÄÄÄÂÄÄÄÄÄÄÄÄÄÂÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÂÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÂo/oÂÄÄÂÄÄ¿
³gn/ye ³ 2x13A ÃÄÄÄÄÄ¿front External Earth ³ ³ ³ ³
³ E AC E _³_panel ³ ³ ³ ³
³ bk N L N L /// ³ ³ ³ ³
³ ÚÄÄ´ ÃÄÄÄÄÄ)ÄÄÄÙ Ú - - - - - - - - - - - - - - ¿ ³ ³ ³ ³
³ ³ ÀÄÄÄ)ÄÄÄÄÄ´ | ÚÄÄÄÂÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄ´<ÃÄÄÄÄÙ ³ ³ ³
³ Run ³ ³ | _³_D2³ ³ D1 | ³ ³ ³
³ Neon 10A ³ | /_\ _³_ _³_ | bk/³ ³ ³
³ ³ Trip ³bk | ³ \_/Q2 Q1\_/ | wh³ ³ ³
³ ÀÄÄÄÄÄÄ´ ³ | ³ ³\ ÚZD ____/³ | ³ ³ ³
³ ³rd ³ Added | ³ ³ Ã47êÄ´<ÃÄ´ ÃÄÄÄÄÄÄÄÄÄÄÄÙ ³ ³
³ 25u 450V ³ ³Solenoid | ³ ³ ³ ÀÄ200ê´ | Oil ³
³ ÚÄ´ÃÄ¿(155V)³ ³-------¿ | 50ê ³ ÀÄÂÄÄÂÄÄÂÄÄÄ¿ +³C1 | Neon ³
³ ³ ³ ³ ³ ===== ³ | ³ ³ _³_ 1k ³C2 ³ ===47u | ³ ³
³ ³ ³ ³ ³_(((()_³ | ³ ³D3/_\ ³ === 2k ³63v | ye ³ ³
³ ³ye ³ye ³ ³ 0.2ê | ÀÄÄÄÁÄÄÄÁÄÄÁÄÄÁÄÄÄ)ÄÄÁÄÄÄÄÄÄÄÄÄÄÄÄÄÄÙ ³
³ ³ ³ ³ ³ | P C B ³ | ³
³_ ³_ _ ³_ _ _ ³ _ _ ³ _ _ _ _ _|_ _ _ _ _ _ _ _ _ _ ³ _ _ _ _| _ _ _ _ _ ³
³ ³or ³or ³rd ³bk | __ oil bk³ bk/wh ³
³ ³1.4ê³ ³1.8ê ³ | Timing |( ÃÄo/oÄÂÄÄÄÄÄÄÄÙ Ú5kÄÄÄÄ¿ ³
_³_ À((()Ù ==== À(((()Ù | Pickup |( ÀÄ´ÃÄÄÙ Spark ||(6k ³
/// ==== Ú(((()¿ ==== | -2V _³_ 1n ? Plug ||(___³
ÀÄ´>ÃÄÙ | /// ||( 1ê
A L T E R N A T O R | C R A N K C A S E M A G N E T O _³_
| ÚÄÄÄÄÄÄÄÄÄ¿ ///
TUBE_³_ gn/ye _³_ FAN
FRAME/// /// COWLING
ELECTRONIC IGNITION
The electronic ignition works in a strange way, as top dead centre approaches a
voltage of -80V or so is made by the magneto primary, this is shorted out when
the timing pulse triggers the SCR, shorting this voltage & producing an
ignition voltage in the magneto secondary.
Only one wire from the crankcase handles both the timing & the oil status. If
low oil, the crankcase oil switch is not made, & the ignition is killed after
the oil warning neon light was lit for 30 seconds.
Does anyone really understand the operation of this ignition circuit?
Any feedback on the working of it would be appreciated.
Y Don't U send an interesting bul?
73 de John G8MNY @ GB7CIP
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