Emotron FDU Series, Instruction Manual, Page: 147 / 260

CG Drives & Automation 01-7491-01r0 Functional description 143
Upper Band [397]
If the speed of the master drive comes into the upper band,
an additional drive will be added after a delay time that is set
in “Start delay [399]”.
Example
Max Speed = 1500 rpm
Min Speed = 300 rpm
Upper Band = 10%
Start delay will be activated:
Range = Max Speed to Min Speed = 1500–300 = 1200 rpm
10% of 1200 rpm = 120 rpm
Start level = 1500–120 = 1380 rpm
Fig. 119 Upper band.
Lower Band [398]
If the speed of the master drive comes into the lower band
an additional drive will be stopped after a delay time. This
delay time is set in the parameter “Stop Delay [39A]”.
Example
Max Speed = 1500 rpm
Min Speed = 300 rpm
Lower Band = 10%
Stop delay will be activated:
Range = Max Speed - Min Speed = 1500–300 = 1200 rpm
10% of 1200 rpm = 120 rpm
Start level = 300 + 120 = 420 rpm
Fig. 120 Lower band.
Start Delay [399]
This delay time must have elapsed before the next pump is
started. A delay time prevents the nervous switching of
pumps.
Stop Delay [39A]
This delay time must have elapsed before the 'top' pump is
stopped. A delay time prevents the nervous switching of
pumps.
397 Upper Band
Default: 10%
Range: 0-100% of total min speed to max speed
398 Lower Band
Default: 10%
Range: 0-100% of total min speed to max speed
(NG_50-PC-12_1)
Flow/Pressure
Speed
Max
Min
Upper band
next pump starts
Start Delay [399]
399 Start Delay
Default: 0 s
Range: 0-999 s
39A Stop Delay
Default: 0 s
Range: 0-999 s
(NG_50-PC-13_1)
Speed
Max
Min
“top” pump stops
Lower band
Stop Delay [39A]
Flow/Pressure