Watlow 8LS Controller - Manual (Page 130)

122 8LS User’s Guide
Appendix C: 8LS Cascade
Choosing the Primary Loop
Use this selection to choose the primary loop for cascade control. This
loop provides the output for the Secondary loop, which is the current
loop as it appears on the upper line of the display.
Setting the High End of the Secondary Setpoint
Use this selection to set the high end of the secondary loop setpoint.
This setting determines the high end setpoint of the Secondary loop (in
this case loop 2) when the Primary loop’s output reaches 100%.
Selectable Range: The range of the input type selected on the
secondary loop.
Setting the Low End of the Secondary Setpoint
Use this menu to set the low end of the secondary loop’s setpoint.
This setting determines the low end setpoint of the Secondary loop (in
this case loop 2) when the Primary loop’s ouput reaches 0%.
Selectable Range: The range of the input type selected on the
secondary loop.
1 2 3 4 5 6 7 8
LOOP PROCESS UNITS
ALARM SETPOINT STATUS OUTPUT%
1 SP?
OUTPUT 2
Current loop
Also the
Secondary loop.
Primary loop. This
loop’s output will
be the setpoint for
the current loop.
1 2 3 4 5 6 7 8
LOOP PROCESS UNITS
ALARM SETPOINT STATUS OUTPUT%
2 100% ?
100 °F
1 2 3 4 5 6 7 8
LOOP PROCESS UNITS
ALARM SETPOINT STATUS OUTPUT%
2 0% ?
0 °F