Myron L 729II - Manual (Page 60)

56
A. PRIMARY COMPONENT IDENTIFICATION
As identified in Section III, the Monitors/controllers switch(es)
and indicator components are mounted directly to the front
panel.
The Monitor/controllers main circuit board is contained within
and mounted to the back of the enclosure. Some models with
options have an additional circuit board mounted behind the
front panel, i.e. Model 758II-4A (4-20 Module).
Review figure V.A.1 below to familiarize yourself with the Main
circuit board assembly. The following diagram has the second
alarm/control module option installed.
V. COMPONENT IDENTIFICATION,
CALIBRATION AND PREVENTIVE CARE
B
L
K
W
H
T
SENSOR
RANGE
MODULE
MAIN
CALIBRATION
CONTROL
SC/SCO
OPTIONAL
SECOND
ALARM/
CONTROL
MODULE
#2 RELAY
LIGHTS &
SWITCH
CONNECTOR
RUBBER TAPE
(DO NOT
REMOVE)
RANGE
MODULE
ALIGNMENT
3SO/3SE
&/OR
3RO/3RE
SWITCH
OR
FLOW SWITCH
CONNECTION
POWER
AC LINE/ +DC
AC NEUTRAL/ -DC
GROUND
RELAY #1
}
COM
NC NO
DISPLAY/METER
CONNECTOR
4-20 CONNECTOR
SET POINT #1
CONVERSION
SET POINT #2 CONTROL
SET POINT #2
CONVERSION
DISPLAY CALIBRATION
CONTROL (FACTORY SET)
SET POINT #1
HYSTERESIS
RIGHT INC
LEFT DEC
CHASSIS GROUND - OEM
SET POINT #2 HYSTERESIS
RIGHT INC / LEFT DEC
SOLID STATE (24VDC 30mW)
OUTPUT
PA™ PIEZO ELECTRIC ALARM
OR
RA™ REMOTE ALARM OR
CUSTOMER CONNECTION
SOLID STATE (24VDC 30mW)
OUTPUT
RA™ REMOTE ALARM AND
PA™ PIEZO ELECTRIC ALARM
OR
CUSTOMER CONNECTION
RELAY #2
}
COM
NO
NC
FULL SCALE
PUSH TO TEST
SET POINT
#1 CONTROL
0-10VDC OUTPUT
N
E
U
(+)
(-)
R
E
D
G
R
N
3S
PA
HYS1 SP1 FS SW
DIS
INC
DEC
CAL
INC
-121
2000µS
} SPC
TRANSFORMER
FUSE*
115/
230
751 756
752 757
753 758
754 759
CHS GND PWR C GD NC NO CM
CM
N
O
N
C
SPC
INC
UP
+
+
PA
RA
{
BK WT RD GN NU R- R+
REMOVE T
O INST
ALL
SECOND RELA
Y
Figure V.A.1