Shipped Configuration/Jumper Positioning; Operation Summary 4.3 - Partlow MRC 7800 Installation, Wiring, Operation Manual

Shipped Configuration/Jumper
Positioning 4.2
Each instrument is factory shipped ready to accept a 4-20 mA process input on each speci-
fied pen. All configuration parameters in each mode are set to default values. These defaults
are shown in tabular form under the description for each mode. Instrument AC power input is
as specified in the instrument model number and as shown on the ratings label. The 230VAC
option includes a switch for changing between 230VAC and 115VAC. If this feature is
provided, verify AC input and switch position before applying power to the instrument.
4.2.1 JUMPER POSITIONING
Jumpers are used in all units to provide a security lockout feature and to condition the process
input for each pen. All jumpers are typically of the three pin type and have two functions. All
jumpers are located on the instrument's Processor board. A board layout and jumper loca-
tions are shown in Appendix A-1 (page 46). Check the actual jumper position in the unit to be
configured and verify the proper position for the intended application. If the current position is
not correct, make changes.
The process input jumpers JU4 and JU5 condition the hardware at a basic level.
Detailed input type selection is made in the Program mode configuration (page 26).

Operation Summary 4.3

The configuration and operating modes, the method of moving from one mode to another, and
the basic parameter functions are described in each individual section . Data and parameter
entry is made by stepping through each mode and making an appropriate response or entry to
each step.
4.3.1 KEYPAD OPERATION
Refer to Figure 4-1 for the Keypad features. Use the SCROLL, UP and DOWN keys as
indicated to program and operate the intrument.
4.3.1.1 UP/DOWN CHANGE RATE
The Up and Down keys are used to adjust numerical values up or down respectively. The
rate at which a given value will change is dependent upon the length of time the key is kept
depressed, initially slow then increasingly faster.
FIGURE 4-1
DISPLAY
SELECT
Key
SCROLL
Key
UP
DISP
Key
SEL
DOWN
Key
P 19
AGE