T-240 circuit problem [RE-wrenches]

[Roy Dyngen]

Hello Dave,

Although transformers can go bad, it should be relatively easy to diagnose
if this one has.  Basically just check the output of the T240 both under
load and not under load.  If you have a problem under load, I would also
check the input side of the transformer to see if the voltage is dropping
there.  If the voltage is stable on the input, but drops on the output, it
is probably the T240.  Let me know what you find out.

Roy Dyngen

-----Original Message-----
From: David Palumbo, Independent Power & Light [mailto:ipl at sover.net] 
Sent: Saturday, August 30, 2003 8:54 AM
To: Wrenches
Subject: T-240 circuit problem [RE-wrenches]


A customer reports the following:

240v water pump operating off of OutBack FX2024 inverter by way of a Trace
T-240 (we specked Trace because T-240 comes with box and customer did not
have OutBack AC box on his system) making loud "grinding noises" while
attempting to power the water pump. The pump is a Grundfos SQ sub pump
pumping into a standard pressure tank setup. FX inverter appears to be
operating fine as he reports no problems with other loads.

TriMetric system monitor showed current going from normal 45 amps dc at 24v
up to 90 amps during this episode. He reported that these numbers were
jumping back and forth violently and the TriMetric meter actually re-set
itself to 100% at this time.

I told him to check all his connections etc. He said he had already done
that. I had him then disconnect the pump feed wire from the T-240 and
connect the pump directly to his 240v generator output. He called back later
to report that he tried this and the water pump worked fine directly from
the generator.

He has had the T-240 working in his system since early spring with good
performance until now. The circuit is as follows: FX2024 > 120vac load ctr >
15A breaker > pressure switch > T-240 T-former > 240v Grundfos SQ sub pump.

Do Transformers go bad? Or what else might cause this problem?

Thanks,
Dave

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