Watlow Series 920 Microprocessor-Based Ramping Control - Manual (Page 11)

Chapter 2
How to Use the Keys and Displays
This chapter will show you the Series 920 front panel, and the function of each
display, key and LED. Figures 6 and 7 explain the 920 front panel.
Display, Key and LED-Location and Explanation
The Watlow Series 920 Ramping Control has two main displays, the process
ACTUAL display at the top of the unit, and the smaller alphanumeric display
below. You set up the Series 920s characteristics in the alphanumeric display
window. On the right of the ACTUAL display there is a red LED and a red
° C LED, indicating the temperature scale ACTUAL is displaying. If neither of
these
LEDs
are showing, the ACTUAL display is showing Process Variable
Units (PVU’s).
The 920 has five touch-membrane keys along the bottom edge of the front
panel: (from left to right) a MODE key, an UP key, a DOWN key, an ENTER
key, and a RUN/HOLD key.
The MODE key steps the processor through the entry prompts.
The UP and DOWN keys increase and decrease or change values in the
alphanumeric display. A single touch to either of these keys will change the
least significant digit by one. Continuous pressure will change the value in the
alphanumeric display at an increased rate. The ENTER key places the value,
in the alphanumeric display, into the processor’s memory.
An alphanumeric display value will flash (when changed with the UP or DOWN
keys) until you press ENTER, placing the value in the processor memory.
The RUN/HOLD key will execute or halt a program.
Front Panel Information
Use Figures 6 and 7 to assist you in learning the locations and functions of the
front panel components.
How to Use Keys and Displays, Chapter 2 WATLOW Series 920 User’s Manual
11