Today's Message Index:
----------------------
1. 07:09 AM - Re: Troubleshooting a Rotax generator (user9253)
2. 02:51 PM - Gem Sensor Optical Switch wiring (jonlaury)
3. 03:19 PM - Re: Gem Sensor Optical Switch wiring (jonlaury)
4. 04:40 PM - Re: Gem Sensor Optical Switch wiring (Richard E. Tasker)
5. 04:47 PM - Re: Re: Gem Sensor Optical Switch wiring (Daniel Hooper)
Message 1
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| Subject: | Re: Troubleshooting a Rotax generator |
Dan,
How did you notice a generator failure? Was the low voltage warning light on?
Did you verify low voltage with a voltmeter? The low-voltage warning light could
be lying.
My Rotax Heavy Maintenance Manual gives the resistance of the generator windings
on page 64. With the master switch on and the engine off, remove the connector
from the voltage regulator and check the resistance of the two generator
yellow wires to ground. There should be infinite resistance to ground. Then
measure the resistance between the two yellow generator wires. It should be less
than one ohm. If more than one ohm, the relay contacts or generator winding
is open.
If the resistance checks are normal, chances are that the generator is OK. You
could also do an operational check. With the voltage regulator connector still
unplugged, connect a voltmeter and a high wattage lamp to the two yellow generator
wires and start the engine. The lamp should get brighter and the voltage
should go up with RPM.
Joe
--------
Joe Gores
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=313775#313775
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| Subject: | Gem Sensor Optical Switch wiring |
The diagram for wiring this switch to an inductive load (relay coil) doesn't compute
for me. Can someone explain why there's two voltage sources shown?
The optical switch (40ma) in my fuel line is being used to drive a pump relay
(coil @ 36ma)
Thanks,
J
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=313800#313800
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| Subject: | Re: Gem Sensor Optical Switch wiring |
Forgot the attachment. Here it is.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=313803#313803
Attachments:
http://forums.matronics.com//files/els_900_wiring_144.pdf
Message 4
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| Subject: | Re: Gem Sensor Optical Switch wiring |
I would guess that they show the two sources because one is labeled 5 or
12 VDC (to power the sensor) and the other is unlabeled. If you have
the 12V version of the sensor, just connect the "+" of both supplies
together. Basically take the top schematic showing a resistor load and
substitute the relay and diode from the lower schematic for the resistor
and you have it.
Dick Tasker
jonlaury wrote:
> --> AeroElectric-List message posted by: "jonlaury"<jonlaury@impulse.net>
>
> The diagram for wiring this switch to an inductive load (relay coil) doesn't
compute for me. Can someone explain why there's two voltage sources shown?
>
> The optical switch (40ma) in my fuel line is being used to drive a pump relay
(coil @ 36ma)
>
> Thanks,
> J
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=313800#313800
>
>
>
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Message 5
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| Subject: | Re: Gem Sensor Optical Switch wiring |
Hmm. Can I express my dislike for ambiguous datasheets here? Ok, now that that's
done..
It may be expressing the fact that the blue wire, the optical receiver, does not
care too much what its excitation voltage is. That is, even if you have a 5v
or 12v part number, the voltage that drives the blue wire can be a wide range
of values as long as it doesn't exceed 40mA if Blue is shorted to ground, as
it will be when the sensor is triggered.
The datasheet warns you not to connect the Blue wire to voltage without a limiting
load (some sort of resistor, whether it's a relay coil (as in the figure 'Relay
Output'), or the pull-up resistor R (as in 'CMOS/TTL Output'), but as long
as you do that, you can use either the 5/12v source or some other voltage source.
For your case, it sounds like a configuration like the figure 'External Load' might
be the right way to do it, as long as there is a suppression diode in the
coil.
This advice isn't authoritative, since I've never worked with a sensor exactly
like this before, but just a guess (hopefully a good one) based on experience.
--Daniel
On Sep 26, 2010, at 5:13 PM, jonlaury wrote:
>
> Forgot the attachment. Here it is.
>
>
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=313803#313803
>
>
>
>
> Attachments:
>
> http://forums.matronics.com//files/els_900_wiring_144.pdf
>
>
>
>
>
>
>
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