ABB ACQ580 - Page 263

Parameters 259
76.30 Start point 1 Defines the start point 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 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 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);
20.00; 30.00
0.00…32767.00
[rpm/Hz] [m]
Speed/frequency. 1 = 1 unit
76.31 Start point 2 Defines the start point for the second auxiliary motor. See
parameter 76.31 Start point 1.
Vector:
1300 rpm;
Scalar 48 Hz;
58 Hz
(95.20 b0);
25.00
76.32 Start point 3 Defines the start point for the third auxiliary motor. See
parameter 76.31 Start point 1.
Vector:
1300 rpm;
Scalar 48 Hz;
58 Hz
(95.20 b0);
30.00; 20.00
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