Myron L 729II - Manual (Page 32)

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5. Set front panel down or carefully allow to hang from the
harness. Do not drop as the harness connector will pull
out allowing the front panel to fall.
6. While holding the display and the plastic display
retainer plate, carefully remove the display harness
connector. Do not drop the display.
7. Remove and discard the plastic display retainer plate.
8. Insert display connector pins into the Temperature
Module female connector. See figure III.C.1.
9. While holding the front panel, align the display to the
opening and at the same time, align the Temperature
Module mounting holes to the front panel.
10. Reconnect display harness with leads down as shown
in figures III.C.1 & III.C.2.
11. Reinstall the four (4) screws and tighten.
Display Select Switch installation
1. Using a small sharp knife or 1/4” (6.35mm) drill,
carefully cut open the hole on the right side of the front
panel, when viewed from the back, just below the Sensor
connectors on the Temperature module. See
figure III.C.2.
2. Install push-button display switch into this hole and
tighten bezel. See figures III.C.2 & III.C.4.
3. Install push-button/cap on switch.
WARNING: There are two (2) O-rings installed on the switch,
one (1) on the threaded shank and the other is under the push
button. Both of these must be re-installed to maintain IP64/
NEMA 3 ratings. See figure III.C.3.
4. Place “TEMPERATURE” label next to the switch. See
figure III.C.4.
Electrical
1. Connect the display switch harness to the Temperature
Module as shown in figure III.C.1.
2. Connect the Temperature Sensor leads to the
Temperature Module as labeled in figure III.C.1.
CAUTION: The sensor input connectors require only a small
screwdriver or a pen to push on the release levers. The release
levers may be broken or damaged if not pushed straight toward
the CB. DO NOT push the release levers sideways. Follow the
color code as labeled.
3. Connect 0-5VDC output, if desired.
4. To test, turn power ON.
5. Press “TEMPERATURE” front panel switch, display will
show the temperature of the sensor.
6. Turn power OFF.
7. Continue or reinstall the front panel and tightly secure
both retaining screws, see REASSEMBLY below.
3. RECALIBRATION
Electronic Calibration Only. For System Calibration, see below.
The Temperature Module was calibrated at the factory, however,
if you wish to check the calibration the following procedure will
help you to accomplish this task. Exercise caution while per-
forming this procedure.
Requirements:
TP Calibration Module (TPC) or
Two .1% precision resistors -
ZERO - 1000.0Ω (0°C = 0.0V)
SPAN - 1758.56Ω (200°C = 5.0V)
One (1) jumper
A DVM set to DC Volts, a tweaker or small standard slot
screwdriver.
FRONT PANEL
BEZEL
PUSH BUTTON
O-RING O-RING
SWITCH
SWITCH and O-RING ASSEMBLY
Figure III.C.3
Figure III.C.4
FRONT PANEL
TEMPERATURE
Label Location
750II
HIGH LOW
SET POINT
MICROSIEMENS / CM
TEMPERATURE
TEMPERATURE
Switch Location
Figure III.C.2
FRONT PANEL
Rear View
Cut front label
out for Display
Select Switch here
FS ZERO DIS SP2 HYS2
DISPLAY CONNECTION
DISPLAY SWITCH
(UPPER FRONT PANEL)
DISPLAY
TEMPERATURE
SENSOR INPUT
0-5VDC
OUTPUT
DISPLAY
TEMP
CONTROL
HARNESS
TEMP
SENSOR
(-)
(+)
BLU
+
0-5VD
INC
INC
DEC DEC
BRN BR
B
L
O
R
-
+
-
SPC
SELECT
TP/TPO - TEMPERATURE MODULE