T-240 circuit problem [RE-wrenches]

[EH Roy]

Dave,

I'd suggest replacing the switch. I think this is more likely the problem
than the transformer.

You have the system configured as I would (transformer between pressure
switch and well pump so that the transformer only draws juice when the pump
is running). The pressure switch instead of operating at 240 V is now
operating at 120 V. That means twice the current and the additional current
can wear out switches a little faster. Maybe you can replace with a beefier
switch.

Hope this helps.

E. H. Roy
Solar Works Inc.
64 Main Street
Montpelier, VT 05602
802 223-7804 x306
ehroy at solar-works.com


-----Original Message-----
From: David Palumbo, Independent Power & Light [mailto:ipl at sover.net]
Sent: Saturday, August 30, 2003 11:54 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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