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I think I was the first to
install a Alltrax DCX 300-ET in an E20, so here's what I noticed. With the
transmission in neutral and the throttle on high the motor seems to run at
a very high rpm, but with a load on it, (in a gear) it won't run as
fast so I don't worry about it. I think the Alltrax senses the low current
and adjusts the speed automatically. Just don't run it fast in
neutral.
Now my questions. On a
Pulse Width Modulated controller you are always sending full voltage (36 on our
tractors) to the armature, just pulsing its on - off time to
control the speed. On field weakening does the DCX 300 pulse the field, or put a
resistance in it? If it PWMs the field, the field and the armature always
gets 36 volts so are you always running at peak efficiency no matter what your
speed, right?
I know I get about 35% more run
time on a charge cycle than I got with the old G.E. system. Has anyone
else noticed a change in run time?
----- Original Message -----
Sent: Thursday, October 21, 2004 8:55
PM
Subject: (ET) Safe E20 RPM
I?m continuing on my fun filled
project of installing an Alltrax Inc DCX
300-ET controller in my E20. Will someone now tell me the rpm range of
the E20 Elec-Trak motor? I have searched the Digest but have not found where
anyone has published actual motor rpm numbers. Some one advised that mowing
should be performed at an rpm which is not excessive and at an efficient level
to avoid damage to the main motor. I actually want to experiment with a
resistor of a size that may maintain a safe and efficient main motor rpm while
cutting the grass. I use a digital photo sensor tachometer for accurate rpm
measurements so I reasoned that if I knew the safe long term running speed of
the motor the best resister size could be determined. When that size is found
I will set up an alternate speed control dedicated to mowing. What is the
maximum speed that may be considered too high? Someone wrote ?do not rev
the motor too high? or it will fly apart or something bad will happen. Any
comment you make will be appreciated. Thank you, Raymon
Ellis
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