ABB ACS580 - Page 323

Parameters 319
SPFC SPFC enabled. See section Soft pump and fan control
(SPFC) on page.104
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 speed 1 Defines the start speed (Hz/rpm) for the first auxiliary motor.
As the motor speed or frequency exceeds the limit defined by
this parameter, a new auxiliary motor is started.
To avoid nuisance starts of the second auxiliary motor, the
speed of the variable speed motor 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 motor is not started.
To maintain the process conditions during the start of the
second auxiliary motor, a speed hold on time can be defined
with parameter 76.57 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 second auxiliary motor to a speed where it
produces flow. The start of the second auxiliary motor is not
aborted if the speed of the first auxiliary motor decreases
Vector:
1300 rpm;
Scalar 48 Hz;
58 Hz
(95.20 b0)
0…32767 rpm/Hz Speed/frequency. 1 = 1 unit
No. Name/Value Description Def/FbEq16
76.30
Increasing
flow
Speed
Time
Stop
Start
Decreasing
flow
Aux. pump 1
Stop/Start
ON
ON
OFF
OFF
Min. speed
Max. speed
76.41
76.55
76.57
76.56
76.58
ACS580 FW.book Page 319 Wednesday, September 21, 2016 9:48 PM