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Page 45
Pump control with autochange
Flow
Output frequency
Start freq. of aux. drive 1 (par. 9.2 + 1 Hz)
Frequency after
starting the aux. drive1
is par. 9.3 + 1 Hz
Stop freq. of aux. drive 1
(par. 9.3 - 1 Hz)
Frequency after
starting the aux. drive1
is par. 9.3 - 1 Hz
Fmin
par. 1.1
Start freq. of aux. drive 1 (par. 9.2 + 1 Hz)
Start delay of the aux.
drives (par 9.10)
Frequency
increase
during the
start delay
Stop freq. of aux.
drive 1
(par. 9.3 - 1 Hz)
Frequency decrease
during the stop delay
Output frequency
Flow
Stop delay of the aux.
drives (par 9.11)
Fmin
par. 1.1
Output frequency
9. 1
Number of auxiliary drives
With this parameter the number of auxiliary drives in use will be defined. The signals
controlling the auxiliary drives on and off can be programmed to relay outputs or to
digital output with parameters 3
.
6 - 3
.
8. The default setting is one auxiliary drive in
use and it is pre-programmed to relay output RO1.
9. 2
Start frequency of auxiliary drive 1
9. 4
Start frequency of auxiliary drive 2
9. 6
Start frequency of auxiliary drive 3
The frequency of the drive controlled by the frequency converter must exceed the
limit defined with these parameters with 1 Hz before the auxiliary drive is started.
The 1 Hz overdraft makes a hysteresis to avoid unnecessary starts and stops. See
figure 6-26.
Notice!
See the parameter description par.1.1 and 1.2, page 6.
9. 3
Stop frequency of auxiliary drive 1
9. 5
Stop frequency of auxiliary drive 2
9. 7
Stop frequency of auxiliary drive 3
The frequency of the drive controlled by the frequency converter must fall with 1Hz
below the limit defined with these parameters before the auxiliary drive is stopped.
The stop frequency limit also defines the frequency to which the frequency of the
drive controlled by the frequency converter is dropped after starting the auxiliary
drive. See figure 6-26.
9. 10
Start delay of auxiliary drives
The frequency of the drive controlled by the frequency converter must exceed the
start frequency of the auxiliary drive with the time defined with parameter 9
.
10 before
the drive is started. The delay is the same for all auxiliary drives. This prevents the
unnecessary starts caused by momentary start limit exceedings. See figure 6-26.
9. 11
Stop delay of auxiliary drives
The frequency of the drive controlled by the frequency converter must fall below the
stop limit of the auxiliary drive with the time defined with parameter 9
.
11 before the
drive is stopped. The delay is the same for all auxiliary drives. This prevents
unnecessary stops caused by momentary falls below the stop limit. See figure 6-
26.
Figure 6-26 Example of effect of parameters in variable speed and one auxiliary
drive system.