ESAB Precision Plasmarc EPP-600, Instruction Manual, Page: 26 / 90

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sectIon 3 InstallatIon
3.7 Interface cables
CNC Interface (24 Pin)
3.6.2 Marking with two parallel epp-600’s
Water Cooler Interface (8 Pin)
Two EPP-600’s, connected in parallel, and can be used for marking down to 24A and cutting from 100A up to 1000A. Two
simple modifications can be made to the Supplemental Power Source in order to permit marking down to 12A. The modi-
fications are necessary only if marking down to 12A is required.
fIelD changes to perMIt MarKIng DoWn to 12a:
1. CHANGES TO THE PRIMARY POWER SOURCE: None
2. CHANGES TO THE SUPPLEMENTAL POWER SOURCE:
A. Unplug the WHT wire from the coil of K12
B. Remove the ORN jumper from TB7-11 and connect both ends of the jumper on TB7-12.
operatIon of tWo parallel epp-600’s:
1. Provide Contactor On/Off, Cut/Mark, & Pilot Arc Hi/Lo signals to both Primary & Supplemental units for both cutting &
marking. When marking, both power sources are powered up, but the Mark Signal disables the output of the Supple-
mental Power Source if it has been modified for marking down to 12A. If the Supplemental Power Source has not been
modified, it will provide the same output current as the Primary Power Source
2. Feed the same V
REF
signal into both the Primary & Supplemental units for both cutting & marking. For installations
with a modified Secondary Power Source, the output current transfer function for marking is that of the Primary Power
Source: I
OUT
= 80 x V
REF
. For cutting, it is the sum of the Primary & Supplemental Power Sources: I
OUT
= 160 x V
REF
. For
installations with an unmodified Secondary Power Source, the output current transfer function for both cutting and
marking is I
OUT
= 160 x V
REF
.