Page1of 2
Filename:
dual oven-g#2pg1.tcw
Date: 3/02/01
By:R.Pfeifer
DUALOVEN-G#2
SCHEMATIC
ac
ac
-
+
7812
REG.
7912
REG.
1000 uF
1000 uF
C8
C10
C9
C11
C12
0.1uF
0.1uF
10 uF
+12V
-12V
OVEN
BOARD
GROUND
FROMACDISTRIBUTIONBOARD
28VAC
(RED)
GROUND
(GREEN)
28VAC
(WHITE)
BR3
BRIDGE
RECTIFIER
POWERSUPPLYSECTION
THELM324's INTHIS
CIRCUITOPERATE
USING+12VONPIN4
AND -12VONPIN11.
THEDUALOVENBOARD#2PROVIDESCONTROL
OFOVENHEATINGANDCOOLING.THISPAGE
DEPICTSTHEPOWERSUPPLYCIRCUITAND
JITTERCIRCUIT.
SEEPAGETWOFOROVEN
HEATINGANDCOOLINGCIRCUITS.
SWITCHEDACHOT (BLUE)
SWITCHEDACC (BROWN)
"JITTER"CIRCUIT:
OPTIMIZES
TEMPERATURE
STABILITY
3
2
1
+
-
LM324
U3
10
9
8
+
-
U3
LM324
C1 0.02uF
R6
100K
100K
1M
R4
R5
+6V
-6V
TO 'OVEN' AND 'COOL2'
SETPOINTSUMMING
CIRCUITS.
(LABELLED"JITTER")
JITTERCIRCUIT
OVEN
HEATING
AND
COOLING
CIRCUITS
OVEN-GCIRCUITBOARDLAYOUT
POWERSUPPLY
OVEN-GPCB
READY
CICUIT
VR1
VR2
OVEN
BOARD
GROUND
CHASSIS
GROUND
35v
35v
50v
(NOTUSED)
DUALOVENCONFIGURATIONREQUIRES
THEUSEOFASTANDARDOVENPCB
FOROVEN#1ANDASECOND
OVENPCBWITHOUTTHECHASSISCOOLING
FANCIRCUITFOROVEN #2. IFNECESSARY,
ASTANDARDOVENBOARDMAYBEUSED FOR
OVEN #2, PROVIDEDTHATTHECHASSIS
COOLINGCIRCUIT ISLEFTUN-USED.
OVEN-F #2 ISTHESCHEMATICDIAGRAM
FORTHEOVENBOARDWITHOUT
THECHASSISCOOLINGCIRCUIT; ASUSED
FORTHESECONDOVEN INADUAL
OVENCONFIGURATION.
CHASSISCOOLING
FANCIRCUIT
(NOTUSED)
CAUTION:ACHOTANDACC
AREHAZARDOUSVOLTAGESAND
AREPRESENTONTHISANDOTHER
CIRCUITBOARDSWHILETHEG.C.
POWER ISON.
Rev.Date: 7/18/03
By:M.Watts
