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Process and Application Parameters [300]
Speed
Max
Min
Fig. 88
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 addi-
tional pumps.
During the Settle start:
•
PID controller is off.
•
The speed is kept at a fixed level after adding a pump.
Default:
Range:
Communication information
Modbus Instance no/
DeviceNet no:
Profibus slot/index
EtherCAT index (hex)
Fieldbus format
Modbus format
Transition Speed Start [39E]
The transition speed start is used to minimize a flow/pressure overshoot when
adding another pump. When an additional pump needs to be switched on, the
master pump will slow down to the set transition speed start value, before the
additional pump is started. The setting depends on the dynamics of both the
master drive and the additional drives.
The transition speed is best set by trial and error.
In general:
•
If the additional pump has 'slow' start/stop dynamics, then a higher transi-
tion speed should be used.
•
If the additional pump has 'fast' start/stop dynamics, then a lower transition
"top" pump stops
immediately
Lower band
Stop Delay [39A]
39D Settle Start
Stp
A
0 s
0-999 s
43173
169/77
4c65
Long, 1=1 s
EInt
Section 11-3
Lower band
limit [39C]
Flow/Pressure
(NG_50-PC-15_2)
0s
167
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