ABB ACS150 - Critical Speeds; Motor Control; Select

Actual signals and parameters
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25 CRITICAL SPEEDS
Speed bands within which the drive is not allowed to operate.
A Critical Speeds function is available for applications where it is necessary
to avoid certain motor speeds or speed bands because of e.g. mechanical
resonance problems. The user can define three critical speeds or speed
bands.
2501 CRIT SPEED SEL Activates/deactivates the critical speeds function. The critical speed function
avoids specific speed ranges.
Example: A fan has vibrations in the range of 18 to 23 Hz and 46 to 52 Hz. To
make the drive to jump over the vibration speed ranges:
- Activate the critical speeds function.
- Set the critical speed ranges as in the figure below.
0 = OFF
0 = OFF Inactive
1 = ON Active
2502 CRIT SPEED 1 LO Defines the minimum limit for critical speed/frequency range 1. 0
0.0…500.0 Hz Limit. The value cannot be above the maximum (parameter 2503 CRIT
SPEED 1 HI).
2503 CRIT SPEED 1 HI Defines the maximum limit for critical speed/frequency range 1. 0
0.0…500.0 Hz Limit. The value cannot be below the minimum (parameter 2502 CRIT
SPEED 1 LO).
2504 CRIT SPEED 2 LO See parameter 2502 CRIT SPEED 1 LO. 0
0.0…500.0 Hz See parameter 2502.
2505 CRIT SPEED 2 HI See parameter 2503 CRIT SPEED 1 HI. 0
0.0…500.0 Hz See parameter 2503.
2506 CRIT SPEED 3 LO See parameter 2502 CRIT SPEED 1 LO. 0
0.0…500.0 Hz See parameter 2502.
2507 CRIT SPEED 3 HI See parameter 2503 CRIT SPEED 1 HI. 0
0.0…500.0 Hz See parameter 2503.
26 MOTOR CONTROL
Motor control variables
2601 FLUX OPT ENABLE Activates/deactivates the flux optimisation function. Flux optimisation
reduces the total energy consumption and motor noise level when the drive
operates below the nominal load. The total efficiency (motor and the drive)
can be improved by 1% to 10%, depending on the load torque and speed.
The disadvantage of this function is that the dynamic performance of the
drive is weakened.
0 = OFF
0 = OFF Inactive
Parameters in the Long Parameter mode
Index Name/Selection Description Def
f
reference
(Hz)
18
23
46
52
f
output
(Hz)
1Par. 2502 = 18 Hz
2Par. 2503 = 23 Hz
3Par. 2504 = 46 Hz
4Par. 2505 = 52 Hz
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