Maytag Neptune Dryer [RE-wrenches]

[Pagan.MacKay at traceengineering.com]

Hello William,

There are some loads that do not recognize the digital stepped waveform 
of the SW/PS inverters during low/no load operation.  As loads (current) 
increase, the waveform smoothes out due to the filtering affects of the 
transformers and other power filters within the inverter causing the 
problem loads to now typically start working.  By adding a motor run 
capacitor (cap) to the AC output of the inverter you will get the 
benefit of the current flowing through the transformers and filters to 
help round out the steps of the waveform.  Since the voltage and current 
are out of phase with each other the cap draws basically no watts from 
the battery.  The size of the cap is not critical but a 50 
microfarad/370 Vac cap has typically done the job.

The disadvantages of using the cap are that it adds about 4 watts of 
load to the battery and cap will always present a load to the inverters' 
search circuit rendering the search mode unusable.

To make the search mode usable when the load needing the smoother 
waveform is not on, one can put the cap on a switched circuit.  One note 
of caution is the cap will hold its charge for quite some time so having 
a load in parallel with the cap will help discharge the voltage from the 
cap.  A small light bulb (around 15 watts or so) could be used as the 
indicator for when the cap is in the circuit and the discharging load 
when the switch is off.

Best,

Pagan


William Miller wrote:
> Pals:
> 
> I have a client with two PS series inverters and a Maytag Neptune washer
> and dryer.  The washer works but the dryer will not start on the 
> inverter.
> It will start with the generator running.  I've checked line voltage 
> with
> my Fluke 87 in the record mode and there is very little dip in line 
> voltage.
> 
> I am considering suggesting a UPS to filter the waveform but this is
> strictly a guess at some solution.  I know we've discussed which 
> inverters
> will power which appliances, but barring changing out the inverters, 
> what
> else can one do?
> 
> William Miller
> 
> 
> 
> __________________________________________________________________
> William Miller
> SLO Communications: Communications and Power Systems Consulting
> PO Box 50, Santa Margarita, CA 93453
> Voice :805-438-5600		Fax: 805-438-4607	VMail: 805-546-4875
> email: wrmiller at slonet.org
> License No. C-10-773985
> _____________________________________________________________
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> __________________________________________________________________
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> 
> 

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