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Posted by burner1941 on October 6, 2006, 1:03 pm
Just got called that Baldor motor #3 is overloading with the slightess
load.
The old repaired one operates just fine on the test.
Officially this has been going on since July 11th. [from my point of
view since
June] Obviously Baldor didn't check it, like the repair shop requested.
Baldor was contacted by the repair shop, and told we had to do
something,
heat is needed now. Baldor agreed to allow repair shop to obtain
another
brand motor, and they will make it right with them.
Apparently Baldor has a bad batch of motors. It's hard for me to
accept,
because of the amount of time that has elapsed.
I do think Baldor is a fine company, and has quality products, but then
it
shows that they have weaknesses. Their lack of communications and
having
to call back to get them to act, is dissapointing. Of course I'm
dealing thru
the repair shop, but they have a stering reputation here in town, so
I'm thinging
it's Baldor that's lacking, in this situation.
I'll update when I know something new.
Burner
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Posted by Jake on October 6, 2006, 9:36 pm
Of course I'm dealing thru the repair shop, but they have a stering
reputation here in town, so
I'm thinging it's Baldor that's lacking, in this situation.
I'll update when I know something new.
Burner
Burner, the shop is screwing you around... Not Baldor.
You have another problem here... I'd bet you money on it. I've never
seen 1 bad Baldor motor come from the factory... in 20 plus years.. much
less three.
Check the system out more... something is wrong. Simple stuff.. is the
rotation right?
BTW, Baldor is offering to buy another manufacturers motor because
they're tired of screwing with your motor shop and want done with it.
They tried to do the right thing....
Osc... Reliance Motors are excellent... and pricey for General Duty. I
do install them in the most severe applications.
A pump, running right, can be powered by a Leeson or Marathon or even
the Chinese junk just as well as a Baldor. The only question then is how
long it will last.
Jake
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Posted by burner1941 on October 7, 2006, 12:26 am
> Burner, the shop is screwing you around... Not Baldor.
I don't think so, talking to the repair shop since last post I found
out that Baldor is going to do is give them a good motor of their own.
The repair shop is working it out with Armstrong Pump to provide
another motor. Armstrong distributor in Columbus, Ohio is aware of the
situation, so if the repair shop is blowing smoke, they are in concert
together.
I'm not paying for anything this is warranty work from Armstrong Pump
Co. provided by their authorized repair shop. So I can't really
dictate what they are going to provide. This is on Armstrong. The only
thing I'm paying for is the repair of the old Armstrong pump.
Burner
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Posted by burner1941 on October 7, 2006, 1:13 am
Jake, didn't answer some of your questions.
The rotation was checked several times, volts, amps. I've been
challenged by different people.
I'm just service not an engineer, however if something changed in the
system to change the load on this pump, it will show up when I
reinstall the old original pump, because I'm chicken shit to wait any
longer.
I "think" I know this much, when you shut off a discharge valve on a
centrifugal pump, and the motor amps are below full load, and then
barely crack it open and the amps go crazy, it's hard to believe that
it's the system. I've had a similiar problem before and it was a
solved by a larger horsepower motor for the system. It could have been
sized wrong, and operating on the end of it's curve. With this job, it
has a 12 or more year history of the same pump, with the balancing
valve open much further. The old pump's motor didn't fail, just the
bearings, and it needed a seal plate.
This pump is on a primary loop in a boiler room, with two boilers and
their pumps pumping thru the loop, and the secondary pumps are also
pumping thru this loop. I've had the other pumps off/on and the
results are the same. The primary loop probably isn;'t 50 feet around
the boiler room. So I think it's the pump/motor.
Crazy thing about this job, is they have two boiler, with their pumps,
and two secondary pumps, only run one at a time. However they only put
one primary pump on the system, if it's down your done. Go figure.
Like I said we'll see.
Burner
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Posted by Jake on October 7, 2006, 7:30 pm
burner1941 wrote:
> I "think" I know this much, when you shut off a discharge valve on a
> centrifugal pump, and the motor amps are below full load, and then
> barely crack it open and the amps go crazy, it's hard to believe that
> it's the system.
In my experience, that's correct. No discharge FLOW will idle down the pump.
When flow exceeds the prime mover's (motor) ability to handle it... the
motor overloads trying.
Can the impeller clearance to the volute be adjusted on these pumps?
Impeller design or differences will change flow... as you checked for...
but so will the clearance between the impeller and the volute.
I would assume there is a mixer valve in the system? Is it OK? Does your
primary loop maintain its setpoint (like 180 or whatever)? If it's
fluctuating much... that would indicate a valving problem to me.
Higher than spec. flow also means poor transfer... which translates into
really bad efficiency. Do you know where the flow is now?
Sorry for all the questions... it's just I've seen many, many times
where something like a pump is blamed for trouble when it is really
buried a little further along...
Granted... that's all in commercial/industrial systems... but they only
make hydronics more interesting... don' they (-;....
Jake
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