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Old 03-08-2012, 10:25 PM
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Default [EVDL] Tach not working, any ideas?

Hey guys,

I have a warp 9, soliton 1 controller, autometer tach, and this tach pick up:
http://www.evsource.com/tls_speedsensor.php

Whenever I enable the tach on the controller (with a 5000 rpm limit), If I try
to engage the throttle, the motor turns just a bit and quits. If I watch my tach,
I see the tach maxing out (over 8000 rpm). So I know the controller is cutting off
the motor.

I've tried moving the hall effect sensor further and closer, but nothing worked.
I completely removed the sensor just to make sure it wasn't some noise problem and
then the motor ran fine (just no tach info).

Has anyone else run into this? The sensor is open collector and a pullup resistor
is integrated into the harness. I've double checked connections.


I'm stumped.

-ben

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  #2  
Old 03-08-2012, 11:06 PM
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Default Re: [EVDL] Tach not working, any ideas?

I have a similar sensor on my Gizmo, not the unit you bought, just the
sensor used on it. When the sensor is not by a ferrous material there
is +5V between signal wire and ground and when over a ferrous material
there is something like 0.7V. If the voltage never changes that might
be the problem. Maybe the sensor is damaged.

On Thu, Mar 8, 2012 at 9:17 PM, Ben Jarrrett <xxx@xxx.xxx> wrot=
e:
>
>
> Hey guys,
>
> I have a warp 9, soliton 1 controller, autometer tach, and this tach pick=
up:
> http://www.evsource.com/tls_speedsensor.php
>
> Whenever I enable the tach on the controller (with a 5000 rpm limit), If =
I try
> to engage the throttle, the motor turns just a bit and quits. If I wat=
ch my tach,
> I see the tach maxing out (over 8000 rpm). So I know the controller is=
cutting off
> the motor.
>
> I've tried moving the hall effect sensor further and closer, but nothing =
worked.
> I completely removed the sensor just to make sure it wasn't some noise pr=
oblem and
> then the motor ran fine (just no tach info).
>
> Has anyone else run into this? The sensor is open collector and a pull=
up resistor
> is integrated into the harness. I've double checked connections.


-- =

David D. Nelson
http://evalbum.com/1328
http://2003gizmo.blogspot.com

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  #3  
Old 03-09-2012, 05:15 AM
EVDL List EVDL List is offline
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Default Re: [EVDL] Tach not working, any ideas?

Ben Jarrrett wrote
>
> I have a warp 9, soliton 1 controller, autometer tach, and this tach pick
> up:
> http://www.evsource.com/tls_speedsensor.php
>
> Whenever I enable the tach on the controller (with a 5000 rpm limit), If I
> try
> to engage the throttle, the motor turns just a bit and quits. If I watch
> my tach,
> I see the tach maxing out (over 8000 rpm). So I know the controller is
> cutting off
> the motor.
>

I generally like to see a lower value of pullup resistor than the 2.2k which
is used in the above sensor kit, but at least some people have gotten it to
work as-is. We prefer industrial inductive proximity switches from, e.g.,
Automation Direct (a couple of part numbers are given on the FAQ page on our
website... *cough-cough*) as they are robust, immune to external magnetic
fields, and very inexpensive ($20-$25). You do need to supply the mounting
bracket and target for them, though, so they are not nearly as convenient as
the above sensor kit.

One of our customers just did a nice video covering the setup and testing of
the exact same tach sensor. He also had some difficulty with it along the
way but it seemed to be working as expected during the shooting of the
video: http://www.youtube.com/watch?v=FXmelRFPLtQ

Finally, posting your technical support questions to the EVDL and hoping
someone from Evnetics sees them is not nearly as effective as actually
emailing us directly...





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View this message in context: http://electric-vehicle-discussion-list.413529.n4.nabble.com/Tach-not-working-any-ideas-tp4458571p4459235.html
Sent from the Electric Vehicle Discussion List mailing list archive at Nabble.com.

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