MedWeld 4000 Overview
MedWeld 4000 Operator’s Guide
Modified: 12/16/08
1 - 23
M-032116 Programs #T03300, #T02300 and #T02400
the inverter is ready to weld. (This interaction with the weld processor is
described in greater detail in “MFDC Control Component Descriptions”
on page 1-24.)
Weld Processor Output
The weld processor activates the TURN ON ISOLATION
CONTACTOR output to the inverter when it executes Function #52 in
the weld schedule. This output is NOT directly wired to the isolation
contactor: It sends a signal to the inverter that the contactor should be
pulled in. (The inverter’s regulator board receives the signal. The
regulator board is wired to the isolation contactor.)
Weld Processor Input
The weld processor receives the ISOLATION CONTACTOR input
directly from the isolation contactor. This input indicates the status of
the contactor (pulled in or dropped out).
The weld processor also receives a Ready to Weld signal from the
inverter (IRTW). This indicates when the inverter is capable of
providing weld current:
•
The inverter thermal switches indicate that cooling water is present.
•
The isolation contactor can be pulled in.
•
The inverter capacitors are ready for charging (to provide DC bus
voltage).
Communications
The two devices also share the MedLAN serial communications link,
where the weld processor acts as the master device and the inverter
serves as a slave device. (The inverter CANNOT initiate any
communication. It can only respond to requests for data.)
After each weld sequence, the weld processor instructs the inverter to
upload the weld summary, including any fault conditions and weld data.
