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S-74 MPa Plus
Miller S-74 MPa Plus Technical Manual
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ORIGINAL INSTRUCTIONS
−
PRINTED IN USA
©
2020 Miller Electric Mfg. LLC 2020
−
01
Miller Elect
ric
Mfg.
LLC
An Illinois T
ool Wo
rks
Com
pany
1635
West
S
pencer
S
treet
Applet
on,
WI
5
4914 US
A
International
Headquart
ers
−
USA
USA
Phone:
920-735-4505
Aut
o-At
tended
USA
&
Canada
F
A
X:
920-735-4134
Int
ernati
onal
F
AX
:
920-735-4125
For
Int
ernati
onal
Locat
ions
Visit
ww
w
.MillerW
elds.c
om
Proprietary Information - Do not distribute or allow to be used by unqualified persons.
55
Table of Contents
Table of Contents
2
Section 1 − Safety Precautions for Servicing
5
Symbol Usage
5
Servicing Hazards
5
California Proposition 65 Warnings
6
EMF Information
6
Section 2 − Definitions
7
Additional Safety Symbols and Definitions
7
Miscellaneous Symbols and Definitions
9
Section 3 − Specifications
10
Serial Number and Rating Label Location
10
Unit Specifications
10
Environmental Specifications
10
Section 4 − Installation
12
Selecting a Location
12
Equipment Connection Diagrams
13
Rear Panel Connections and Rotating Drive Assembly
14
14-Pin Plug Information for Connecting Wire Feeder to Power Source
15
Wire Type, Size, and Optimal Wire Feed Speed Table
15
Installing Welding Gun
16
Installing and Threading Welding Wire
17
Section 5 − Operation
18
Power Switch
18
Jog/Purge Switch
18
Front Panel Controls
19
Left Display
20
Right Display
20
Adjust Control Left/Right
21
Setup Push Button
21
Start Push Button
21
Crater Push Button
21
Program Select Push Button
21
Power Source Selection Menu
22
Operational Terms
23
Section 6 − Setting Sequence Parameters
24
Sequence Parameters in a Program
24
Section 7 − Programming
25
Setup Menu
25
Setup Menu Level 2
26
Setting a Start Sequence in Synergic Pulse
27
Setting a Start Sequence in Non−Synergic Pulse or MIG
28
Setting a Crater Fill Sequence in Synergic Pulse
29
Setting a Crater Fill Sequence in Non−Synergic Pulse or MIG
30
Profile Pulse
31
Factory Reset Procedure
31
Section 8 − Theory of Operation
32
Section 9 − Troubleshooting
33
Troubleshooting Table
33
Troubleshooting Circuit Diagram for S-74 Mpa Plus
36
Location of Circuit Boards
38
Motor Board PC1 Testing Information
40
Motor Board PC1 Test Point Values
41
Diagnostic Led's on User Interface Board PC2
43
User Interface Board PC2 Testing Information
44
User Interface Board PC2 Test Point Values
44
Pin Filter Board PC5 Testing Information
46
Pin Filter Board PC5 Test Point Values
47
Trigger Filter Board PC6 Testing Information
48
Trigger Filter Board PC6 Test Point Values
49
Tachometer Board PC51 Testing Information
51
Section 10 − Maintenance
52
Diagnostics
52
Section 11 − Electrical Diagrams
53
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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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