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[AMPS] Step Start for AL-80A

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Subject: [AMPS] Step Start for AL-80A
From: (Phil Clements)
Date: Sun, 15 Mar 1998 21:42:03 -0600
At 10:02 PM 3/15/98 -0500, you wrote:
>Thanks to all who replied to my recent inquiry.  As requested by some,
>here is a brief summary of the responses:

>6.  Another idea was to install a zero current relay (available at HVAC
>and electrical supply houses).

Bad idea...the inrush current needs to be limited until the filter cap.
is charged up to 2/3rds its total capacity. A zero current relay is far too
fast for this! a resistance must be installed in the a.c. mains and left in
until the cap comes up to speed. This is different in each application; the
resistance/time is adjusted until the goal is reached of the 2/3rds charge.
An easy way to put yourself in the ball park on a step-start circuit is to
look at the plate voltage (available on most amp multimeters) as you turn 
the power switch on. The voltage will come up to about 2/3rds of its normal
value and stay there for 1 second or less when the resistance/time adjustment
has been made correctly.


Phil, K5PC

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