142 Functional description CG Drives & Automation 01-7492-01r1
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/stop method. This could cause unnecessary starting
and stopping of additional pumps.
During the Settle stop:
• PID controller is off.
• the speed will ramp down after adding a pump.
Transition Speed Stop [39G]
The transition speed stop is used to minimize a flow/
pressure overshoot when shutting down an additional pump.
The setting depends on the dynamics of both the master
drive and the additional drives.
In general:
• If the additional pump has 'slow' start/stop dynamics,
then a higher transition speed should be used.
• If the additional pump has 'fast' start/stop dynamics,
then a lower transition speed should be used.
Example
Max Speed = 1500 rpm
Min Speed = 200 rpm
TransS Start = 60%
When less additional pumps are needed, the speed will be
controlled up 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 highest run time
hours will be switched off.
Fig. 119 Transition speed stop
Run Times 1-6 [39H] to [39M]
Reset Run Times 1-6 [39H1] to [39M1]
Pump Status [39N]
Number backup/reserve [39P]
Sets the number of pumps used for backup/reserve which in
normal conditions can not be selected. This function can be
used for increasing redundancy in the pump system by
having pumps in reserve that can be activated when some
pumps indicate fault or are shut off for maintenance.
39F Settle Stop
Default: 0 s
Range: 0–999 s
39G TransS Stop
Default: 60%
Range: 0-100% of total min speed to max speed
NOTE: If set to 0 %, the transition speed when
stopping pumps, is ignored and no speed adaption is
made.
I.e. the slave pump is stopped directly and speed of
the master pump is continued.
39H Run Time 1
Unit: h:mm:ss (hours:minutes:seconds)
Range: 0:00:00–262143:59:59
39H1 Rst Run Tm1
Default: No
No 0
Yes 1
39N Pump 123456
Indication Description
C
Control, master pump, only when alternating
master is used
DDirect control
OPump is off
EPump error
39P No of Backup
Default: 0
Range: 0-3
Speed
Max
Trans
Actual
Min
Actual shut down of pump
Master pump
Switch off procedure starts
Additional pump
Flow/Pressure
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