Watlow Series 920 Microprocessor-Based Ramping Control - Manual (Page 14)

Chapter 3
WARNING:
Doing a cold start
will cause all setup
parameters and files
to be lost. DO NOT
put DIP switch #1 in
the ON position
unless
all user-
programmed
information is to be
cleared.
14
Learning the Series 920 -
A Sample Program in Action
This chapter will guide you through an easy sample program for the Series 920. You
can quickly grasp the necessary terms and concepts by entering and
observing this
exercise.
If you feel that your knowledge of profiling controllers does not require a sample
program to learn the Series 920, skip this chapter.
A Brief Overview
This sample program wilt teach you the fundamentals of creating a ramping profile,
along with ways to expand that profile to its greatest versatility.
The program example will start with a simple ramp and soak profile. A ramp pro-
gresses from one set point to another set point over a period of time, or ramp rate,
expressed in degrees/time. Soaking then controls the length of time the temperature
is held at this level.
We will, then expand it to multiple ramp and soaks, add JUMPLOOP functions, per-
form an AUTOSTART, LINK to another profile, and finally perform a WAITFOR step.
At this point make copies of your Master Step Chart on Page 53.
to keep track of your program as you go. It is a good practice
It is also a good idea to sit down and define
exactly what you want your program to do.
Enter Real Time of Day
First, set the Series 920s “real time-of-day, 24-hour clock.” Remember the MODE
key is used to progress through the menus. The UP/DOWN keys are used to select
parameters and values, and remain flashing until you press the ENTER key.
1. Press the MODE key until the SETUP menu appears. Press the ENTER key.
2. At ACCESS, enter (0) with the UP/DOWN keys; press ENTER. This is your
calibration (CALIB) menu.
3. Press the MODE key until HOUR appears in the alphanumeric display and press
ENTER. Note that hours are in a 24 hour format.
WATLOW Series 920 User’s Manual Sample Program, Chapter 3