Watlow Controls 8LS, User Manual

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40 8LS User’s Guide
Using the 8LS
Displays
The next section discusses the 8LS displays:
•
Bar Graph display
• Single Loop display
•
Scanning display
• Alarm display
Bar Graph Display
This is the default display on power-up. It provides a system overview
by displaying a deviation bar graph for each loop. Loop status including
acknowledged alarms, manual or auto are also displayed.
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.
The lower display shows each loop’s status. The table below shows the
loop status symbols.
Loop Status Symbol
Description
Loop
Function
Loop Display
AUTO A Single output loop is in automatic control mode.
The output power percentage displayed is for the
heat output.
HEAT H
T
Dual output loop is in automatic control and the
heat output is active. The output power percentage
displayed is for the heat output.
COOL C
L
Dual output loop is in automatic control and the
cool output is active. The output power percentage
displayed is for the cool output.
MANUAL M Loop is in manual control mode. Output power
percentage displayed is for the heat output.
1 2 3 4 5 6 7 8
LOOP PROCESS UNITS
ALARM SETPOINT STATUS OUTPUT%
A
A A A A M M
M