ESAB EPP-400 Manuel D'instructions page 305

section 6 troubleshootinG
6.5 control circuit interface using J1 and J6 connectors
Interface to the EPP-400 control circuitry is made with connectors J1 and J6 on the front panel. J1 has 19 conductors, and
J6 has 10.
J6 accesses two functions: Cut / Mark selection; and a galvanically isolated output current signal. The power source de-
faults to Cutting mode when there is no signal fed into J6-A. When 115V AC from J1-F is fed into J6-A, K11 is activated plac-
ing the EPP-400 in the Marking mode. For more details concerning the operation of K11 and the Cut / Mark modes, refer to
Subsection 6.10, Pilot Arc HI / LO & Cut / Mark Circuits.
J6-A, J6-B, and J6-C provide connections to an isolated Hall effect Current transducer that provides a precision signal for re-
mote sensing the power source output current. See Subsection 6.11, Current Transducer for Optional Current Monitoring.
J1-A and J1-B provide access to the galvanically isolated transistor output signal indicating an "Arc On" condition. See
Subsection 6.8, Arc Current Detector Circuits. J1-C and J1-D are the inputs for the remote Voltage Reference Signal that
commands the EPP-400 output current Subsection 6.9, Current Control Pot & Remote Vref. J1-G and J1-F supply 115V AC
for remote controls. See Subsection 6.6, Auxiliary Main Contactor (K3) & Solid State Contactor Circuits and Subsection 6.10,
Pilot Arc Hi/lo & Cut/mark Circuits.
J1-J and J1-K are connections to a Fault Relay Contact. Note that this contact is closed when a fault condition exists and
when the input power is removed from the power source. The contact is open only when input power is applied and no
fault exists.
J1-M and J1-N are the input connections for the Emergency Stop function. For Emergency Stop to operate, the Jumper
between TB8-18 and TB8-19 must be removed.
J1-L is the input to K8 that parallels S1 switch contact. When 115V AC from J1-F is fed into J1-L, K8 activates placing the Pilot
Arc in High.
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