Name: Miller S-74 MPa Plus
Brand: Miller
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TM-273245 Page 39S-74 MPa Plus

9-6. Diagnostic LED’s On User Interface Board PC2

272234-B

LED1

LED Status Self-Test

1 On Indicates +15 volts DC present on motor board PC1 with respect to DC circuit common.

Off If LED1 and LED2 are on − power supply circuits on motor board are working properly.

If LED1 and LED2 are off − Check power coming into motor board, and/or replace motor board.

If LED1 or LED2 is off − Replace motor board.

Table of Contents2
Section 1 − Safety Precautions for Servicing5
Symbol Usage5
Servicing Hazards5
California Proposition 65 Warnings6
EMF Information6
Section 2 − Definitions7
Additional Safety Symbols and Definitions7
Miscellaneous Symbols and Definitions9
Section 3 − Specifications10
Serial Number and Rating Label Location10
Unit Specifications10
Environmental Specifications10
Section 4 − Installation12
Selecting a Location12
Equipment Connection Diagrams13
Rear Panel Connections and Rotating Drive Assembly14
14-Pin Plug Information for Connecting Wire Feeder to Power Source15
Wire Type, Size, and Optimal Wire Feed Speed Table15
Installing Welding Gun16
Installing and Threading Welding Wire17
Section 5 − Operation18
Power Switch18
Jog/Purge Switch18
Front Panel Controls19
Left Display20
Right Display20
Adjust Control Left/Right21
Setup Push Button21
Start Push Button21
Crater Push Button21
Program Select Push Button21
Power Source Selection Menu22
Operational Terms23
Section 6 − Setting Sequence Parameters24
Sequence Parameters in a Program24
Section 7 − Programming25
Setup Menu25
Setup Menu Level 226
Setting a Start Sequence in Synergic Pulse27
Setting a Start Sequence in Non−Synergic Pulse or MIG28
Setting a Crater Fill Sequence in Synergic Pulse29
Setting a Crater Fill Sequence in Non−Synergic Pulse or MIG30
Profile Pulse31
Factory Reset Procedure31
Section 8 − Theory of Operation32
Section 9 − Troubleshooting33
Troubleshooting Table33
Troubleshooting Circuit Diagram for S-74 Mpa Plus36
Location of Circuit Boards38
Motor Board PC1 Testing Information40
Motor Board PC1 Test Point Values41
Diagnostic Led's on User Interface Board PC243
User Interface Board PC2 Testing Information44
User Interface Board PC2 Test Point Values44
Pin Filter Board PC5 Testing Information46
Pin Filter Board PC5 Test Point Values47
Trigger Filter Board PC6 Testing Information48
Trigger Filter Board PC6 Test Point Values49
Tachometer Board PC51 Testing Information51
Section 10 − Maintenance52
Diagnostics52
Section 11 − Electrical Diagrams53

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Owner's Manual52 pages

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Miller S-74 MPa Plus Specifications

General

Brand	Miller
Model	S-74 MPa Plus
Category	Wire Feeders
Language	English

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