Page1of 2
Filename: heat-gpg1.tcw
Date: 12/20/97
By:R. Fenske
HEAT-G
SCHEMATIC
10
9
8
+
-
LM324
U2
6
7
+
-
LM324
U2
Rx
1N914
20K
ac
ac
-
+
7812
REG.
7912
REG.
C11
C12
0.1uF
+12V
-12V
HEATBOARD
GROUND
FROMACDISTRIBUTIONBOARD
28VAC
(RED)
GROUND
(GREEN)
28VAC
(WHITE)
BR1
BRIDGE
RECTIFIER
POWERSUPPLYSECTION
+12V
DISPLAYBOARD
HEATZONE
LOCALSETPOINT:
(LOCALANDTOTAL
SETPOINT
PUSHBUTTONS)
J1
YELLOWWIREOF
PHONECABLE
TODISPLAYBD.
"ACTUAL"
(PUSHBUTTON)
R2
1M
1M
R7
0.1
uF
C2
D1
3
2
1
+
-
LM324
U2
THERMOCOUPLE
INPUTFROM
HEATEDZONE
RED
YELLOW
GROUND
THERMOCOUPLE
AMPLIFIER
R1
C1
1M
0.1uF
1
3
4
5
2
6
U4
MOC3030
(220V-MOC3041)
R3
100OHM
1WATT
R12
100OHM
1WATT
ACOUTPUT
TOHEATER
SCR1
Q6004
SWITCHED
ACHOT
INPUT
(BLUE)
SWITCHED
ACC
INPUT
(BROWN)
12
13
14
+
-
U2
LM324
BLACKWIREOF
PHONECABLE
TODISPLAYBD.
"LED"
DISPLAY
BOARD
R6
1K
J1
J1
10
9
8
+
-
LM324
U3
12
13
14
+
-
U3
LM324
5
R8
10K
3
2
1
+
-
LM324
U3
R5 1M
10K
R9
10K
R10
5
6
7
+
-
LM324
U3
10K
R11
THELM324's INTHIS
CIRCUITOPERATE
USING+12VONPIN4
AND -12VONPIN11.
"JITTER "CIRCUIT:
OPTIMIZES
TEMPERATURE
STABILITY
SETPOINTCIRCUIT:
USERADJUSTSTOSET
DESIREDTEMPERATURE
OFHEATEDZONE
THERMOCOUPLE
AMPLIFIERCIRCUIT:
DETERMINESACTUAL
TEMPERATUREOF
HEATEDZONE
SUMMINGCIRCUIT:
ADDSTHEJITTER
ANDTHESETPOINT
TOGETHERPRIOR
TOTHECOMPARATOR
CIRCUIT
COMPARATOR
CIRCUIT:
COMPARES
THEACTUAL
TEMPERATURE
(PIN9) TOTHE
SETPOINT
TEMPERATURE
(PIN10)
ACSWITCHING
CIRCUIT:
SWITCHESACTO
HEATEDZONETO
ACHIEVEDESIRED
TEMPERATURE
LEDDRIVERCIRCUIT:
PROVIDESVISUAL
VERIFICATIONOF
HEATERFUNCTIONS
C3
0.02uF
R15
1M
1M
1M
R13
R14
THEHEATBOARDPROVIDESTEMPERATURE
CONTROLOFHEATEDZONES INTHEG.C.
( ieTCDBLOCK;HEATED INJECTOR;ETC.).
EACHHEATBOARDCONTAINSUPTOTHREE
TEMPERATURECONTROLCIRCUITS.
THISPAGEDEPICTSTHESCHEMATICOFHEAT
CIRCUIT#1.SEETHENEXTPAGE
FORHEATCIRCUITS#2AND#3.
D2
1N4004
HEATCIRCUIT#1
SWITCHEDACHOT (BLUE)
SWITCHEDACC (BROWN)
CAUTION:ACHOTAND
ACCAREHAZARDOUS
VOLTAGESANDARE
PRESENTONTHISAND
OTHERCIRCUITBOARDS
WHILETHEG.C. POWER ISON.
R13
1K
D2 ISSHORTED
FORTHEECD
ANDTHERMAL
DESORBER
HEATERS
+6V
-6V
43Hz
HEAT
BOARD
GROUND
CHASSIS
GROUND
3
2
6
+
-
U1
INA114
R34
200ohm
8
1
5
Q1
SPADE
LUG
U1-5ckt. 3
U1-5ckt. 2
LM35
Rev.Date:9/26/02
By:M.WATTS
R33
10K
OPTIONAL
A/D
ENABLE
(HEATZONE#1ONLY)
OPTIONALGATE
SIGNALFOR
EXTERNALTRIAC
(HEATZONE#1ONLY)
SPADE
LUG
C8
C10
1000 uF
35V
1000 uF
35V
0.1uF
C9
10uF
50V
2N3903
1K
+12V
GREENAND
REDWIRES
OFPHONE
CABLEFROM
DISPLAYBD.
10uF
50V
C4
