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QPAC Modular SCR Power Control Service
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Watlow QPAC Modular SCR Power Control Service User Manual Page 39
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Modular SCR
1
Power Control
1
Service Manual
1
Use The Manual
2
Table of Contents
3
Chapter 1
4
Overview
5
Specifications
6
Chapter 2
8
Preventive Maintenance
8
Chapter 3
9
Operation Theory of
9
Base and Firing Cards
9
Three Phase, Two Leg - Q32
10
Power Base Operation
10
Three Phase, Three Leg - Q33
11
Q33 Block
12
Zero Cross Control Cards
13
(work on all bases)
13
14 WATLOW QPAC Service Manual
14
Chapter 4
15
Test Procedures
15
Bias & Gain
16
Chapter 5
17
Troubleshooting
17
18 WATLOW QPAC Service Manual
18
Problem: No Heat
18
WATLOW QPAC Service Manual 19
19
Troubleshooting, Chapter 5
19
Problem: Partial Heat
20
22 WATLOW QPAC Service Manual
22
24 WATLOW QPAC Service Manual
24
WATLOW QPAC Service Manual 25
25
Bench Testing
27
Testing SCRs in the Unit
28
Installing an SCR Package
28
WATLOW QPAC Service Manual 29
29
30 WATLOW QPAC Service Manual
30
Appendix
31
Watlow QPAC Service Manual
43
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