Watlow Series 922 - Manual (Page 8)

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WATLOW Series 922 User's Manual Starting Out, Chapter 1
The Series 922 is a dual channel PID controller. You may input individual sets of
PID parameters for each output. This includes rate, reset, proportional band and
cycle time. By setting the proportional band(s) to zero, the Series 922 becomes
a simple ON/OFF control, with a 3°F or 1.7°C switching differential.
Two of the Series 922's auxiliary outputs may be alarms or events. An event is
an ON/OFF auxiliary output relay signal. You can use events, based on time, to
trigger peripheral equipment or processes. Depending on your individual system
needs, you may order an external event board with two or eight outputs.
Operator-friendly features include automatic entry codes or "prompts" to aid in
setup. When there's a power outage, the Watlow Series 922 stores all informa-
tion in a nonvolatile memory.
When you first apply power, the unit will "come up" with default values for set
points and control parameters. These default values provide minimum operating
information for the control until you program in the desired data. The default
values are listed in the Master Step Menus and Charts,
pp. 46-61.
Remove the Series 922 carefully from its shipping container. Be sure to set this
literature aside where it will not be discarded.
Packing List
Included with your Watlow Series 922 are two mounting brackets with integral
screws, and this manual.
Put Your Control to Work—Three Steps
Once your control is installed and wired, getting the Series 922 "up and running"
is a three-part process:
• First, match the control's "personality," to your system in what we call the
SETUP menu; that is input type, units of measure, range, calibration offset,
output action, alarm type, lockout.
• Second, tune the control, making final PID entries.
• Third, enter up to ten separate profiles in the PROGRAM menu.
Starting Out