Watlow 12LS Controller - Manual (Page 37)

4-4
4.2 DISPLAYS
On power-up the controller defaults to the BAR GRAPH display which shows the status of all 12 loops.
From there the user may switch to the SINGLE LOOP display which provides more detailed information about any
selected channel. The channel displayed in the SINGLE LOOP display may be changed by using the UP and DOWN
ARROW keys.
A SCANNING display is also available which automatically increments the channel to be displayed in the SINGLE
LOOP fashion continually looping through all active channels of the 12 available, showing each for a short period of
time.
If an alarm occurs the ALARM display is shown.
4.2.1 BAR GRAPH DISPLAY
This is the default display on power up.
The upper display shows the BAR GRAPH for each loop. The highest and lowest level of the BAR GRAPH display
are the upper and lower deviation alarms. If deviation alarms are OFF the display range is +5% of setpoint. The
intermediate levels are linearly spaced between the upper and lower limits.
|-------------------------------------------------|
¦ ¦
¦ Bar Graphs | ¦
¦ ¦ ¦
¦ Channel -| ¦ |- Channel ¦
¦ 1 |----------------| 12 ¦
¦ ¦-___ -__ _-____-¦ ¦
¦ ¦ MMAH CCHH MAAM ¦ ¦
¦ |----------------| ¦
¦ ¦ ¦
¦ ¦ ¦
¦ |- Loop Status Symbols ¦
¦ ¦
|-------------------------------------------------|
Figure 4-2. BAR GRAPH DISPLAY
Refer to Table 4-2 for descriptions of loop status symbols used.
If an acknowledged alarm exists, the BAR GRAPH is replaced by an alarm symbol. Refer to TABLE 4-2 for a
description of alarm symbols used.