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G8MNY  > TECH     02.07.10 10:33l 106 Lines 5399 Bytes #999 (0) @ WW
BID : 57376_GB7CIP
Read: DD3IA GUEST DG9NBR OE7FMI
Subj: HONDA Generator EX500 info
Path: DB0FHN<DB0MRW<DB0ERF<OK0NAG<OK0PPL<DB0RES<DK0WUE<7M3TJZ<UA6ADV<GB7CIP
Sent: 100702/0038Z @:GB7CIP.#32.GBR.EU #:57376 [Caterham] $:57376_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, Terminal Font)

A few years ago, I was given one of these small old 4 stroke petrol generators
with no information. It would not start (hence it was given away less loads of
screws!), but I managed to trace the cause to a completely blocked main
carburettor jet, after a major strip down to get at the bits & several goes at
gently cleaning the jet (not to enlarge the hole it) it now runs OK.

     .컴컴컴컴컴컴�.           Breather旼�                 .컴컴컴컴컴컴�.
    / /~~~~~~~~~~~\ \            Handle� � Filler         / /~~~~~~~~~~~\ \
.컴좔좔컴컴컴컴컴컴좔�,      Low旼컴컴컨컨콥賽컴풲rips  ,좔좔컴컴컴컴賽嘗좔좔�.
�    ____             �      oil� [] 旼컴� o  | 퀁un   �                      �
�   넌맙 �             �      Hz� 悶 �_"_� o  � �      �           Speed(O)   �
�   �____�             �     Ind� 잎 읕컴�[_] � 쿽ff =�                       �
�    Plug               �       �~ ~ ~AC~ DC ~ ~�     �                       �
�                       첼Pull  � 悶            �    渼                 旼컴� �
�        Exhaust(o)     납Start � 납            �    납              Oil� 0 � �
�                       쵬      � 잎            �    윱 o Earth         읕컴� �
읓컫컴컴컴컴컴컴컴컴컫컫�       읓컫컴컴컴컴컫컫�     읓컫컴컴컴컴컴컴컴컴컫컫�
  ~                   ~           ~    Feet   ~         ~                   ~

But when I laid it up for a while it can be difficult to start (carburettor not
emptied), I found that putting a few CCs of petrol into the carburettor intake
fixed that (or using a "Cold Start" Ether spay), as dried up petrol is less
volatile.

CONTROLS
It could not be simpler, the RUN /OFF leaver operates the engine kill switch &
the double petrol & vent tap. There is a bimetallic operated choke, so nothing
to do other than pull hard on the start cord handle. If the engine has low oil
then the warning light lights.

RATING
In the low rev quiet & economy mode @ 50Hz it gives 330VA, 400VA MAX, or set to
the noisier higher reving 60Hz it gives 400VA, 500VA MAX, this is also the 
"Lamp" mode to reduce 25Hz content of the 4 stroke that makes lamps flicker,
e.g. 1 power BANG in 4 half wave load cycles.

  BANG -255V    _._225V      -BANG    _._
      / \      /   \        / \      /   \
     �   �    �     �      �   �    �     �      �
     High \  /       \.__./     \  /       \.__./
     Volts ~~240V     210V       ~~
     55Hz   52Hz   49Hz   46Hz
      Fast               SLow

Generators with much heaver flywheels tend to suffer less from this.

It also has 12V 100W charging output, which is 20V with no load, & 6-8A typical
unregulated charge current, but it is connected to the 220V output!

ECONOMY
It is also VERY economical if you don't need high power. e.g. it can run some
small fluorescent lamps, a rotator & float a 12V battery with 100W HF rig OK,
for some 6 hours from 1 fill of its small 2.5L tank. So 1 gallon per day is
feasible when /P for 12 hours/day operating.

CIRCUIT
I have reverse engineered the diagram & it is very complex for such a small
unit!
                       ON Lamp컴컫컴컴컴E      CHARGING
                  ______    �    �   13A S/O   +複 DC�-        ___o 쿛ush
                 쿟uning쳐컴)컴컴�   N     L    �    �       _�_  o 쿚FF
                 쿑orks 쳐컴�  gn�   �   rd�   Trip  �            �
                 쿓z Ind�   � /ye�   쿫l   �   10A   �            �
                 읕컴컴켸 gy�    �   �    Trip  �  bk�            쿫k/rd
              Oil Lamp컫컴컴�    �   �     3A   퀇h  �            �
Left Alt          ye�  쿲y  �    �   �     �    �    �            �
Module              �  �    �    �   �     읕컴�)컴컴)컴컴�       �
旼컴�6 pole Alt     �  �    �    �   �     旼컴�)컴컴�    퀁d     �
�   쳐崙컴퓑h       �  �    �    �   �    _�_   �   _�_   �       �
�   �  28�)         �  �    �0.6怨   �18� \_/ 1怨1� \_/ 2怨     bk�
�   쳐崙컴�bk       �  �    �((((�   �((((컨�(((�(((컨�(((�       �
쿌  쳐켰컴컴컴컴컴컴)컴)컴컴컴컴�)컴컴컴컴컴컴컴컴컴컴컴� �       �
�   �   gn Feedback �  �         � Main 2 pole Alternator �       �
쿣  쳐켰컴컴컴컴컴컴)컴)컴컴컴컴�)컴컴컴컴컴컴컴컴컴컴컴컴�  ___  �
�   �   bl           \  \      gn쳐컴컴컴�(((((컴컴컴컴컴컴캑SCR쳐�     /Stark
쿝  �      r/w   50Hz \  \      _�_       430�      bk/rd   쿔GN�   10k� Plug
�   쳐崙�)))))켰컴o    \  \                      ______ bn  �   쿫k/wh )|  �
�   �  ye   읕崙o \__   \  \_旼컴컴커bl         쿟iming쳐崙캑   쳐켰컴�)|  �
�   �  ye   bk/w 60Hz�   \___쿐ngine쳐컴훟      쿓ead  쳐켰캑   �    1�)|  �
�   쳐崙컴컴컴崙컴컴켸     旼퀾odule쳐컴o/      � 73 � � ye 읕쩡�      읕쩡�
읕컴�     op-gn    y/r    _�_읕컴컴켸bl Oil     읕컴컴켸     _�_        _�_
                                     Switch
� or � are connectors.

DC USE
Note, the DC is connected to the 230V! So the 230V will no longer be floating
safely if it is used with the DC output at the same time!

See my bul on "Regulating 12V genny output" for the circuit that I use with it.

MODS
From my long bul "Petrol generators for SSB use", I did the Rev up feed forward
modification, & it did slightly improve voltage regulation under load. I also
did the ignition QRM mods, & fully suppressed this generator.


Y Don't U send an interesting bul?

73 de John G8MNY @ GB7CIP


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