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Process and Application Parameters [300]
168
speed should be used.
Default:
Range:
Communication information
Modbus Instance no/
DeviceNet no:
Profibus slot/index
EtherCAT index (hex)
Fieldbus format
Modbus format
Example
Max Speed = 1500 rpm
Min Speed = 200 rpm
TransS Start = 60%
When an additional pump is needed, the speed will be controlled down to min
speed + (60% x (1500 rpm - 200 rpm)) = 200 rpm + 780 rpm = 980 rpm.
When this speed is reached, the additional pump with the lowest run time
hours will be switched on.
Speed
Actual
Trans
Min
Fig. 89
Transition speed start
Flow/Pressure
Fig. 90
Effect of transition speed
Settle Time Stop [39F]
The settle stop allows the process to settle after a pump is switched off before
the pump control continues. If an additional pump is stopped D.O.L. (Direct On
,
Line) or Y/
the flow or pressure can still fluctuate due to the 'rough' start/
39E TransS Start
Stp
60%
A
60%
0-100% of total min speed to max speed
43174
169/78
4c67
Long, 1=1%
EInt
Switch on
procedure starts
Additional pump
Master pump
Actual start
command of next
pump (RELAY)
Transition speed
decreases overshoot
Section 11-3
Flow/Pressure
(NG_50-PC-16_1)
Time
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