Set the timer 0 for constant running speed in par. 13-20
SL Controller Timer
[0]. Ex.: 2 sec.
Set Event 1 in par. 13-51
SL Controller Event
[1] to
True
[1]
Set Event 2 in par. 13-51
SL Controller Event
[2] to
On Reference
[4]
Set Event 3 in par. 13-51
SL Controller Event
[3] to
Time Out 0
[30]
Set Event 4 in par. 13-51
SL Controller Event
[1] to
False
[0]
Set Action 1 in par. 13-52
SL Controller Action
[1] to
Select preset 0
[10]
Set Action 2 in par. 13-52
SL Controller Action
[2] to
Start Timer 0
[29]
Set Action 3 in par. 13-52
SL Controller Action
[3] to
Select preset 1
[11]
Set Action 4 in par. 13-52
SL Controller Action
[4] to
No Action
[1]
Set the Smart Logic Control in par. 13-00
SL Controller Mode
to ON.
Start / stop command is applied on terminal 18. If stop signal is applied the frequency converter will ramp down and go into free mode.
6.1.7 BASIC Cascade Controller
The BASIC Cascade Controller is used for pump applications where a certain pressure (“head”) or level needs to be maintained over a wide dynamic
range. Running a large pump at variable speed over a wide range is not an ideal solution because of low pump efficiency at lower speed. In a practical
way, the limit is 25% of the rated full load speed for the pump.
In the BASIC Cascade Controller the frequency converter controls a variable speed (lead) motor as the variable speed pump and can stage up to two
additional constant speed pumps on and off. By varying the speed of the initial pump, variable speed control of the entire system is provided. This
maintains constant pressure while eliminating pressure surges, resulting in reduced system stress and quieter operation in pumping systems.
6 Application Examples VLT
®
AQUA Drive Design Guide
162
MG.20.N5.02 - VLT
®
is a registered Danfoss trademark
6
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