| Well I'm finally getting around to test the relays and here are the readings I get with full throttle. FYI - I'm still thinking it may be the second speed that is out since the throttle is near the gate limit in reverse when it changes speed.
1A large studs = 3.8 V 1A small studs = 0 V According to the E16 manual test 1 of missed second speed I should replace the 1A contactor because I don't have 36 V on the small studs but test 2 says when I have 0V, I should replace 1A switch (what and where is this?) .
2A large studs = 200 MV 2A small studs = 35.8 V Again, according to the E16 manual test of missed third speed I should replace the 2A contactor because I don't have 4 V on the large studs.
I'm no electrician so what is this telling me? Could everything be haywire at once or am I misreading the causes of the test values?
Thanx Dean
On Dec 23, 2010, at 6:03 AM, RJ Kanary wrote:
<When engaging the "throttle", the 2AH relay closes (but slower than
the
RTN relay). As I go thru the speeds the 2AH never releases. Should
it?>
That is as it
should be.If
the traction motor is not heavily loaded, the relay should pick up in
First speed.
<The way I read the EGT Circuitry manual, 2AH should
not engage until speed 3 is hit.>
Much was lost
in the translation from the GE manual to the NI manual. :(
So, if
2A contactor coil
voltage is present, and the return side of the coil circuit is
intact,the only suspect remaining would be an issue within the
contactor itself.If the insulation bushings for the large studs soften,
the contacts can recede enough that the disc hits the bushings before
it can find the contacts. The armature reversing contactors can also
suffer this fate but that will be something to look forward to in the
future.
{As Bill Gunn would counsel, keep those high current connections
clean and tight. Check them annually.}
RJ
Dean Stuckmann wrote:
When engaging the "throttle", the 2AH relay closes (but
slower than the RTN relay). As I go thru the speeds the 2AH never
releases. Should it? The way I read the EGT Circuitry manual, 2AH
should not engage until speed 3 is hit.
I agree, the NI manuals suck, especially when I don't have an
electrical background.
Dean
On Dec 22, 2010, at 8:27 PM, RJ Kanary wrote:
Verify the
operation of the 2AH Relay that is the final arbiter when it comes to
full armature voltage.No
2AH closure, no 3rd speed, no 3rd speed means
no Field Weakening so you lose all the rest of them too.
BTW the GE diagrams are far easier to follow than the clones
used by NI. :)
RJ
Dean Stuckmann wrote:
Pretty sure it should have 7 F and 3 R...
Maybe its 2nd that dropped instead of 3rd. Just trying to
judge
it by how far I have to move the lever to have it change speeds...
Thanx
On Dec 22, 2010, at 3:37 PM, RJ Kanary wrote:
The NI service
information is available at
http://www.elec-trak.com/
How many traction motor speeds is this tractor supposed to have ?
I've never seen any NI tractors here in Western Pennsylvania.
RJ
Dean Stuckmann wrote:
Hi,
I think I dropped speed 3.
There are only 2 speeds in reverse as well.
It will go into the higher speeds (but still seems to skip 3) if the load is small, but its reluctant to go faster when blowing snow.
Power pulse button does not want to work either.
I have the Service manual for GE but I don't know if the 150 is the same as any of the GE models. Maybe a E-16???
Any help is appreciated.
Happy Holidays.
Dean
_______________________________________________
Elec-trak mailing list
Elec-trak cosmos phy tufts edu
https://cosmos.phy.tufts.edu/mailman/listinfo.cgi/elec-trak
|