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Programming Considerations for Power Up Operation
What can there possibly be to program that has anything to do with power wiring?
Considering this from the operator’s perspective, what does he expect to see when
he turns on the power? The default menu column “d” has four (4) programming
blocks. The set default blocks d3 and d4 are the domain of the installer or mainte-
nance person, but the other two blocks affect what the operator can see and do at
power up. Block d1 sets the power up display. Should the unit always display rate, or
count at power up, or should it just come up to the display that was showing when
the power went down? Block d2 determines what the totalizer displays, either a six
digit total in divide by 1, or 10, or 100 mode, or a 10 digit total.
Speaking of the front panel keys, what should they do for the operator? The program
mode is entered using these keys, but it is a good idea to lock out the program from
the operator. This is done by programming a control input (in column “L”, page 30) to
do one of the lockout functions and then wiring that input to common as shown in the
control input wiring diagram. For totalizers with the relay option and for all batchers,
the reset key may perform an output unlatch function as well as, or instead of, the
reset function. This is set by programming block L4. Batchers have start and stop
keys available to the operator. Both keys can do one or more functions depending
upon the choices made in blocks L5 and L6 respectively.
WIRING cont.
