Watlow QPAC Modular SCR Power Control Service Manual de usuario Pagina 1

QPACModular SCRPower Control1241 Bundy Blvd., P.O. Box 5580, Winona, MN 55987-5580, Phone: 507/454-5300, Fax: 507/452-4507QPAC-SA10-9403April, 1994$10

10 WATLOW QPAC Service ManualOperation Theory, Chapter 3Q32Three Phase, Two Leg - Q32Power Base OperationThe Q32 uses two pair of SCRs connected in in

WATLOW QPAC Service Manual 11Operation Theory, Chapter 3Q33Three Phase, Three Leg - Q33Power Base OperationThe Q33 uses three SCR/diode pairs(hybrid)

12 WATLOW QPAC Service ManualOperation Theory, Chapter 3Q33 Blockinto 256 parts. When the control card sends out a pulse, U7A picks the correct halfc

WATLOW QPAC Service Manual 13Operation Theory, Chapter 3CardsAF - Phase Angle Fired (08-5288)The AF card provides a delayed SCR turn ON, pro-viding a

14 WATLOW QPAC Service ManualOperation Theory, Chapter 3CardsBV - Burst fired with aVariable Time Base (08-5342)The BV card is time proportioning with

WATLOW QPAC Service Manual 15Test Procedures, Chapter 4ProceduresChapter 4Test ProceduresQ01 and Q32No power base adjustments are required on the Q01

16 WATLOW QPAC Service ManualTest Procedures, Chapter 4Bias & GainThese adjustments are necessary for the following control cards:QBF - Bias and G

WATLOW QPAC Service Manual 17Troubleshooting, Chapter 5ProceduresChapter 5TroubleshootingIndications of Malfunction1. No output under any circumstance

18 WATLOW QPAC Service ManualTroubleshooting, Chapter 5Q01Problem: No HeatBlown FuseThis can be done one of two ways. Measure voltage across the fuse.

bad. The resistor will usually be black or dark brown if open. It should read a mini-mal voltage of < 1V. If it reads line voltage R10 is bad. See

2 WATLOW QPAC Service ManualContentsUse The ManualHow to Use the Manual• General Description • Indication of Malfunction • Specifications• Cleaning Fa

20 WATLOW QPAC Service ManualTroubleshooting, Chapter 5Q01Problem: Partial HeatThis problem can be broken down into two categories:Uncontrollable Hea

WATLOW QPAC Service Manual 21Troubleshooting, Chapter 5Q32Problem: No HeatBlown FuseThis can be done one of two ways. Measure voltage across the fuse.

The QPAC Transformer or Resistor Fuse (R10) is BadCheck for AC voltage present at the transformer (T1), see Page 34 for transformerwiring. Be extremel

WATLOW QPAC Service Manual 23Troubleshooting, Chapter 5Q32The QPAC Mother Board is BadRefer to the mother board troubleshooting procedure on Page 28.T

24 WATLOW QPAC Service ManualTroubleshooting, Chapter 5Q33Problem: No HeatBlown FuseThis can be done one of two ways. Measure voltage across the fuse.

WATLOW QPAC Service Manual 25Troubleshooting, Chapter 5Q33The QPAC Transformer or Resistor Fuse (R10) is BadCheck for AC voltage present at the transf

26 WATLOW QPAC Service ManualTroubleshooting, Chapter 5Q33Problem: Full or Partial Uncontrollable HeatThe SCR Switch is Shorted Remove the control car

WATLOW QPAC Service Manual 27Troubleshooting, Chapter 5Bench TestingQPAC-01Single Phase LoadT2T1L2L1T1Control Card+-ACCommand Signa4-20mA or0-5VDCQPA

28 WATLOW QPAC Service ManualTroubleshooting, Chapter 5SCRsTesting SCRs in the UnitA shorted SCR will show full uncontrollable line voltage at the T t

WATLOW QPAC Service Manual 29Troubleshooting, Chapter 5CardsU12 is used to detect the loss of L2 phase, (phase loss) and U13 is used to detectthe prop

WATLOW QPAC Service Manual 3ContentsContentsTable of ContentsChapter 1 QPAC Modular SCR Power Control PageGeneral Description ...

30 WATLOW QPAC Service ManualTroubleshooting, Chapter 5CardsQAF Card (08-5288)Q1 makes up the FWZ signal which is inverted by U3A to give a high signa

WATLOW QPAC Service Manual 31Waveforms, AppendixAppendixFigure 16 Scope Picture 12ms/divFWZ QPAC-01 and QPAC-32 BaseFigure 17 Scope Picture 22ms/divFW

32 WATLOW QPAC Service ManualWaveforms, AppendixAppendixFigure 25 Scope Picture 10QBV 5ms/div1) FWZ (TP1) 2) Output Pulses (TP4)Figure 26 Scope Pictur

4 WATLOW QPAC Service ManualOverview, Chapter 1OverviewChapter 1QPAC Modular SCR Power ControlFigure 1 - The QPAC-01SCR Power ControlGeneral Descripti

Watlow QPAC Service ManualWatlow Controls, 1241 Bundy Blvd., P.O. Box 5580, Winona, MN 55987-5580, Phone: 507/454-5300, Fax: 507/452-4507

WATLOW QPAC Service Manual 5Overview, Chapter 1OverviewControl Cards Part Number• Solid state contactor, AC input, QCA 08-5285• Solid state contactor,

6 WATLOW QPAC Service ManualOverview, Chapter 1SpecificationsQPAC SpecificationsOperation• Modular control base with plug-in card and transformer •

WATLOW QPAC Service Manual 7Overview, Chapter 1SpecificationsOutput • 120VAC through 480VAC (600VAC, consult factory) • 1, 2, or 3 pole • 30 thr

8 WATLOW QPAC Service ManualMaintenance, Chapter 2ProceduresChapter 2Preventive MaintenanceCleaning Cooling Fans, Fins and FilterCooling a power contr

WATLOW QPAC Service Manual 9Operation Theory, Chapter 3Q01Chapter 3Operation Theory ofBase and Firing CardsSingle Phase Model - Q01Power Base Operatio