Manual

Sample Program
16 WATLOW Series 1500 User's Manual Sample Program, Chapter 2
IMPORTANT
NOTE:
If you have a
Series 1500 T/C
version, or are
using the RTD
version for 2
channels of temp-
erature control
(TEMP-TEMP), then
simply consider
all sample program
references to
relative humidity
as a second
channel of temp-
erature. Use the
sample values as
temperatures
rather than relative
humidities.
Chapter 2
Learning the Series 1500 — A Sample Program
in Action
This chapter will guide you through an easy sample program for the Series 1500.
You can quickly grasp the necessary terms and concepts by entering and observing
this exercise.
If you feel that your knowledge of programmable controllers does not require a
sample program to learn the Series 1500, feel free to skip this chapter. In the
Technical Reference section (Chapter 4), you will find details on all material here.
The Series 1500 Wonderful-Apple-Pie
Sample Program
Let's assume that Great-Grandma handed down to you her secret recipe for wonder-
ful apple pie. It's not that her ingredients are so different; but she took great care to
control baking temperature and humidity, and to add topping ingredients at just the
right times in the baking cycle. These really are fantastic apple pies, so you've
bought an oven with a Series 1500 control, and you're starting an apple pie business.
Sample Program Chart
The chart here shows the baking process. Grandma's original recipe had Grandpa
turn the oven on early in the morning. Grandpa would raise and lower the oven
temperature at certain times, too. That is one of Grandma's secrets. With the Series
1500 you'll be able to make your oven "loop" between 275° and 110° three times
before a pie is done.
If Great-Grandma was right, this process should turn out a really fine apple pie.
Since your bakery will begin baking pies at the same time every morning, you'll want
your Series 1500 to automatically start the process each day.
The chart below details the "wonderful-apple-pie" sample program for the Series
1500.