Equalize charge - SW4024 [RE-wrenches]

[allan]

Kurt,
    I haven't tried the pressure switch on the T240 primary.  It sounds OK,
but it seems to me it's lots of conductors: hot from inverter to PS,
switched hot back from PS to T240 input, 2 hots from T240 to pump, neutrals
as needed...is my circuit-bozo imagination running amok here?  Maybe you put
the T240 near the pump controller.
    If the T240 is located next to the inverter in the power cabinet, then
it seems that all I need is a low current (a few milliamps for the relay
coil--we use TFN 2-C 18/2 float switch cable) signal wire and my 240 to the
pump controller.
    On the job I'm thinking of, we worked with a 3/4 hp AC pump (run off a
PS2524) with a cistern, controlled by a float switch and DC timer (weak
well, 2 1/2-hour pump cycles/day, daylight hours only) and a 24V Flowlight
Booster Pump controlled by a pressure switch.  At the client's request, I
set up a DPDT switching circuit on the relay control circuitry to allow the
Booster Pump to be bypassed if desired, and the AC sub to pump and
pressurize, controlled by a second pressure switch.  It's a manual
operation, as the tank and flow valves had to be switched, but it worked
well and the client was pleased.
Allan
-----Original Message-----
From: Kurt Nelson, SunWise <sunwise at win.bright.net>
To: RE-wrenches at topica.com <RE-wrenches at topica.com>
Date: Tuesday, October 17, 2000 9:38 AM
Subject: Re: Equalize charge - SW4024 [RE-wrenches]


>allan wrote:
>>
>> John,
>>     RE the EQ: It's [another] design/software weakness in the SW.
>
>Hey Allan,
>
>Yup on the EQ,  One can also up the bulk voltage (and possibly
>absorption time) to something that will approximate an EQ.  Too bad it
>doesn't just work the way it should.
>
>> On the pumps: When you say DC250, do you mean T240?  By all means,
control
>> the T240 on the primary side to avoid phantom loads.  We have done a
3/4hp
>> 240 well pump with a standard open-coil relay with 24VDC coil voltage
>> (Grainger 3X749), letting the control circuit (float switch or pressure
>> switch) operate the DC coil.
>
>I have done a number of 3/4 horse 240 volt pumps with the Trace T-240
>and have had good success switching the T-240's primary hot lead
>directly from a Square D pressure switch, paralleling both sets of
>contacts on the pressure switch.
>
>On Grid-tied systems, I add a double throw 30 amp power relay with 240
>volt coil and leave the pump on the utility unless they go down.  That
>relay switches the pump (and it's regular pressure switch) between the
>utility and the output end of the T-240 based on the presence of 240vac
>utility at the coil.  In this case, I still use the other pressure
>switch to supply power from the inverter to the primary of the T-240,
>and set this pressure switch to come on and shut off at a slightly lower
>pressure settings than the main pump pressure switch.  Actually, Bob-O
>may have originally come up with this arrangement.
>
>Kurt Nelson
>
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