Micromod Micro-DCI: 53IT5100A Indicator/Totalizer - Manual (Page 58)

After the front display panel is removed, the main printed circuit board can be accessed. The main
printed circuit board also has the power supply as well as the microprocessor circuitry. To remove
the main PCB, use its front edge board ejector to pull it free from the rear terminal board slot and
carefully slide it from the case. Disconnect the front display panel flat ribbon cable from the main
PCB. The replacement main PCB can now be installed by connecting the front display panel ribbon
cable, sliding the PCB into the instrument case, seating it into the rear terminal board slot, and in-
stalling the front display panel.
NOTE
Power Supply Fuses
AC Power: 1A, 250 V, Fast Blow Schurter Type 034.3930
DC Power: 3A, 250 V, Slow Blow BEL Type 5TT3
f
or additional information, contact MicroMod Automation.
NOTE
When communicating with
MicroMod
for replacement of the main PCB,
reference the unit’s serial number to ensure the correct replacement
assembly is supplied. The necessary ordering information is provided
on the instrument data tag and on the manufacturing specification sheet
supplied with that particular controller.
In the event of a hardware malfunction, a replacement PCB can be quickly substituted for the defec-
tive assembly to minimize downtime. Contact
MicroMod
for instructions before returning equipment.
The defective PCB should be carefully packaged and returned, shipping charges prepaid, to the Re-
pair Dept. of AB. Do not wrap PCBs in plastic, as it can cause static damage. It is suggested
that the defective PCB be returned in the special bag in which the replacement module was sup-
plied.
5.3 CALIBRATION
The instrument’s analog inputs (ANI0-3) and output (ANO0) are extremely stable. They normally
do not require recalibration. If it becomes necessary to recalibrate the instrument, due to the inad-
vertent change of the stored calibration values, then this can be accomplished by altering their re-
spective datapoints. The calibration span and zero datapoint locations are as follows:
ANI0 ANI1 ANI2 ANI3 ANO0
Calibrate Zero B263 B264 B265 B266 B267
Calibrate Span C296 C297 C298 C299 C300
Note: The Spans have a nominal value of 1.0 and can be adjusted
up or down within the range of 0.8 to 1.2. The Zeros have a nom-
inal value of 128 and can be adjusted up or down within the range
of 100 to 150.
53IT5100 Indicator/Totalizer
5-2