<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.