Myron L 729II - Manual (Page 32)

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 IP65/NEMA 4X
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
retaining screws, see REASSEMBLY, page 31.
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 performing
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.
28
Figure III.C.2
FRONT PANEL
Rear View
LOW
Cut front label
out for Display
Select Switch here
FS ZERO DIS SP2 HYS2
DISPLAY CONNECTION
TP/TPO - TEMPERATURE MODULE
DISPLAY
SELECT
TEMP
CONTROL
HARNESS
DISPLAY SWITCH
(UPPER FRONT PANEL)
DISPLAY
TEMP
SENSOR
TEMPERATURE
SENSOR INPUT
0-5VDC
OUTPUT
(-)
(+)
BRN
BLU
+
-
0-5VD
DEC DEC
INC
INC
SPC
BR
BL
OR
- +
Figure III.C.4
FRONT PANEL
TEMPERATURE
Label Location
720II MYRON L
COMPANY
LOW
HIGH LOW
SET POINT
TEMPERATURE
Switch Location
ORP
TEMPERATURE
SWITCH
FRONT PANEL
BEZEL PUSH BUTTON
O-RING O-RING
SWITCH and O-RING ASSEMBLY
Figure III.C.3