144 Functional description CG Drives & Automation 01-7491-01r0
Upper Band Limit [39B]
If the speed of the pump reaches the upper band limit, the
next pump is started immediately without delay. If a start
delay is used this delay will be ignored. Range is between
0%, equalling max speed, and the set percentage for the
“UpperBand [397]”.
Fig. 121 Upper band limit.
Lower Band Limit [39C]
If the speed of the pump reaches the lower band limit, the
'top' pump is stopped immediately without delay. If a stop
delay is used this delay will be ignored. Range is from 0%,
equalling min speed, to the set percentage for the “Lower
Band [398]”.
Fig. 122 Lower band limit
Settle Time Start [39D]
The settle start allows the process to settle after a pump is
switched on before the pump control continues. If an
additional pump is started D.O.L. (Direct On Line) or Y/
,
the flow or pressure can still fluctuate due to the 'rough'
start/stop method. This could cause unnecessary starting
and stopping of additional pumps.
During the Settle start:
• PID controller is off.
• The speed is kept at a fixed level after adding a pump.
39B Upp Band Lim
Default: 0%
Range:
0 to Upper Band level. 0% (=max speed)
means that the Limit function is switched off.
Speed
Max
Min
Upper band
Start Delay [399]
Upper band
limit [39B]
next pump starts
immediately
Flow/Pressure
39C Low Band Lim
Default: 0%
Range:
0 to Lower Band level. 0% (=min speed)
means that he Limit function is switched off.
39D Settle Start
Default: 0 s
Range: 0-999 s
Speed
Max
Min
Lower band
Stop Delay [39A]
Lower band
limit [39C]
“top” pump stops
immediately
Flow/Pressure
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