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TB046 Rev1 230 VAC to 440 VAC
Overview
This document describes converting an existing 230 vac unit to a 440 vac unit
The lube pump and spindle cooling fan must be rated for 110vac
The Spindle motor and the flood pump motor must be rated for 440 vac
The main power cable and all other cables that will carry 440 vac must be rated for at least 440 vac
The main power fuses must be changed to the proper voltage and current ratings
To change to 440 vac operation first check that main power cord spindle cable or power to the inverter and
spindle cable and flood cable are type SEOW
600 vac and not SJEOW 300 vac If type SJEOW they
must be changed
Main fuses must be changed to a 500 vac fuse with a current rating of HALF the original 230 vac rating
Overload protectors for the flood and spindle on a non inverter unit must be set for the correct current load
Primaries of transformers T1 and T2 must be reconfigured for 440 vac operation On T1 this is accomplished
by moving one leg of the incoming 440 vac to terminal 0vac on the first set of primaries and the other leg to
terminal 230 vac of the second set of primaries and then installing a jumper between terminal 230vac on the
first set of primaries and terminal 0vac on the second set of primaries
On T2 this is done moving any connections at terminal H2 to H4 Moving any connections at H3 to H1 and
installing a jumper between H2 and H3
WARNING Be sure to remove any original jumpers before reconfiguring transformers
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Document History
Rev1 Created on 2000 08 11
by #337