Page2of 2
Filename: epchi-b2.tcw
Date: 12/20/97
By:R. Fenske
EPCHI-B
SCHEMATIC
13
12
14
+
-
LM324
U1
9
8
+
-
LM324
U1
40.2K
FORPID
20K
FORFPD
4.02k
FORHID
20K
+12V
DISPLAY
BOARD
DETECTOR
PARAMETERS
LOCALSETPOINT:
(LOCALANDTOTAL
SETPOINT
PUSHBUTTONS)
GREENAND
REDWIRES
OFPHONE
CABLEFROM
DISPLAYBD.
J1
1M
R5
0.1
uF
C1
10
SETPOINTCIRCUIT:
USERADJUSTSTOSET
DESIREDCURRENTFORHID,
PIDORVOLTAGEFORFPD
X1000DIFFERENTIALAMPLIFIER:
COMPARESTHEACTUALCURRENT
ORVOLTAGE (PIN13) TOTHESETPOINT
CURRENTORVOLTAGE (PIN10)
1K
R6
1M
R12
1K
R8
1M
R7
R2
5OHM
5WATT
Q1
2N3903
1M
R14
(10uF)PID-FPD
(0.1uF)HID
C2
2
1
+
-
LM324
U1
1M
R13
0.01
uF
C4
3
5
7
+
-
LM324
U1
10M
R16
6
100K
R17
0.1uF
C3
20VUNREG.
FORPID,FPD
EPCHI
GROUND
FROMACDISTRIBUTIONBOARD
28VAC
(RED)
GROUND
(GREEN)
28VAC
(WHITE)
POWERSUPPLYSECTION
YELLOW
WIRES
OFPHONE
CABLETO
DISPLAYBD.
"ACTUAL"
J1
DISPLAY
BOARD
R1
1K
J1
BLACKWIREOF
PHONECABLE
TODISPLAYBD.
"LED"
+12V
Q2
2N3055
ONSOLDER
SIDE
THEHIGHVOLTAGESECTIONCONTAINSTHE
CIRCUITSTHATSUPPLYPOWERTOTHEPID
LAMP, THEFPDPHOTO-MULTIPLIERTUBE
ANDTHEHIDELECTRODE.
TRANSISTORSQ1&Q2
PROVIDETHEREQUIRED
INPUTVOLTAGETOTHE
HIGHVOLTAGEPOWER
SUPPLY
INPUT
HIGHVOLTAGEOUTPUT
EMCO
L15B
HIGH
VOLTAGE
POWER
SUPPLY
R10
R9
100KFORPID, FPD
10KFORHID
1KFORPID
0.0FORFPD
CHASSIS
GROUND
TOPIDLAMP
ORPMT
-700VDC
JUMP
FOR
PID/HID
JUMP
FOR
FPD
PID,HID
FPD
FEEDBACKTO
DIFFERENTIAL
AMPLIFIER
D1
1N4004
FPD
DIVIDE
BYTEN
AMP
1500VDCMAX.OUTPUT
ON/OFF
SWITCH
C5 (FPDONLY)
0.33uF650V
R11
1K
EPCHI
BOARD
GROUND
CHASSIS
GROUND
Rev.Date:4/17/02
By:M.WATTS
R1
(U1)AMPLIFIER
FORPIDOR
FPD IS: LM324
FORHID: LF347
4700pF
FOR
HID
ADD:
22MFORHID
ac
ac
-
+
BR1
BRIDGE
RECTIFIER
1000uF
C8
35V
20VREG.
FORHID
SEEPAGE1FOR
(+)AND(-)12VPOWER
SUPPLIES
POWERSUPPLY
SOURCE:
+20VREGULATED
FORHID
OR
+20VUNREGULATED
FORPID, FPD
THELM324ANDTHE
LF347 INTHIS
CIRCUITOPERATE
USING+12VONPIN4,
GNDONPIN5,AND
-12VONPIN11.
