Watlow QPAC Modular SCR Power Control Service Manuale Utente Scaricare il pdf (Pagina 27)

WATLOW QPAC Service Manual 27

Troubleshooting, Chapter 5

Bench Testing

QPAC-01

Single Phase

Load

Control Card

Command Signa

4-20mA or

0-5VDC

QPAC-33

3 Phase

Load

Control Card

Command Signa

4-20mA or

0-5VDC

QPAC-32

3 Phase

Load

Control Card

Command Signa

4-20mA or

0-5VDC

Bench Testing Hookups

Equipment Required

• Dummy Load, min. 1A

• 0-15VDC Command (signal)

❋ NOTE:

Dummy loads can

be made up using

100 watt light bulbs.

Bulbs can be put in

series to obtain the

proper voltage rat-

ing. (4each, 100

watt, 120V bulbs

per phase for 480V)

An SCR will not

latch without a

load.

❋

1 2 ... 22 23 24 25 26 27 28 29 30 31 32 ... 42 43

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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