ABB ACS560 - Page 347

Parameters 347
PFC PFC enabled. One pump at a time is controlled by the drive.
The remaining pumps are direct-on-line pumps that are
started and stopped by the drive logic
The frequency (group 28 Frequency reference chain) / speed
(group 22 Speed reference selection) reference must be
defined as PID for the PFC functionality to work properly.
SPFC enabled. For more information, see Pump and Fan
Control (PFC) macro on page.125
2
SPFC SPFC enabled. For more information, see Soft Pump and Fan
Control (SPFC) macro on page.134
3
76.25 Number of motors Total number of motors used in the application, including the
motor connected directly to the drive.
1
1…4 Number of motors. 1 = 1
76.26 Min number of
motors allowed
Minimum number of motors running simultaneously. 1
0…4 Minimum number of motors. 1 = 1
76.27 Max number of
motors allowed
Maximum number of motors running simultaneously. 1
1…4 Maximum number of motors. 1 = 1
76.30 Start point 1 Defines the start speed (Hz/rpm) for the first auxiliary pump.
As the motor speed or frequency exceeds the limit defined by
this parameter, a new auxiliary pump is started.
To avoid nuisance starts of the auxiliary pump, the speed of
the variable speed pump should be higher than the start
speed for the duration defined by parameter 76.55 Start
delay. If the speed decreases below the start speed, the
auxiliary pump is not started.
To maintain the process conditions during the start of the
auxiliary pump, a speed hold on time can be defined with
parameter 76.57 PFC speed hold on. Certain pump types do
not produce significant flow with low frequencies. The speed
hold on time can be used to compensate the time needed to
accelerate the auxiliary pump to a speed where it produces
flow.
Vector:
1300 rpm;
Scalar 48 Hz;
58 Hz
(95.20 b0)
0…32767 rpm/Hz Speed/frequency. 1 = 1 unit
76.31 Start point 2 Defines the start speed (Hz/rpm) for the second auxiliary
motor. See parameter 76.31 Start point 1.
Vector:
1300 rpm;
Scalar 48 Hz;
58 Hz
(95.20 b0)
76.32 Start point 3 Defines the start speed (Hz/rpm) for the third auxiliary motor.
See parameter 76.31 Start point 1.
Vector:
1300 rpm;
Scalar 48 Hz;
58 Hz
(95.20 b0)
76.41 Stop point 1 Defines the stop speed (Hz/rpm) for the first auxiliary motor.
When the speed of the motor connected directly to the drive
falls below this value and one auxiliary motor is running, the
stop delay defined by parameter 76.56 Stop delay is started.
If the speed is still at the same level or lower when the stop
delay elapses, the first auxiliary motor stops.
The running speed of the drive is increased by [Start point 1 -
Stop point 1] after the auxiliary motor stops
Vector:
800 rpm;
Scalar 25 Hz;
30 Hz
(95.20 b0)
0…32767 rpm/Hz Speed/frequency 1 = 1 unit
No. Name/Value Description Def/FbEq16