Critical Speeds - ABB ACS355 User Manual

All parameters
No. Name/Value
2402 TORQ RAMP
DOWN
0.00...120.00 s Time
25 CRITICAL
SPEEDS
2501 CRIT SPEED
SEL
OFF
ON
2502 CRIT SPEED 1
LO
0.0...500.0 Hz /
0...30000 rpm
2503 CRIT SPEED 1
HI
0.0...500.0 Hz /
0...30000 rpm
2504 CRIT SPEED 2
LO
0.0...500.0 Hz /
0...30000 rpm
2505 CRIT SPEED 2
HI
0.0...500.0 Hz /
0...30000 rpm
Description
Defines the torque reference ramp down time, ie the
minimum time for the reference to decrease from the
nominal motor torque to zero.
Speed bands within which the drive is not allowed to
operate.
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.
f (Hz)
output
52
46
23
18
1 2 3 4
Inactive
Active
Defines the minimum limit for critical speed/frequency range
1.
Limit in rpm. Limit in Hz if parameter
MODE setting is SCALAR:
above the maximum (parameter
Defines the maximum limit for critical speed/frequency
range 1.
Limit in rpm. Limit in Hz if parameter
MODE setting is SCALAR:
below the minimum (parameter
See parameter 2502 CRIT SPEED 1
See parameter 2502.
See parameter 2503 CRIT SPEED 1
See parameter 2503.
Actual signals and parameters 231
1 Par. 2502 = 18 Hz
2 Par. 2503 = 23 Hz
3 Par. 2504 = 46 Hz
4 Par. 2505 = 52 Hz
f (Hz)
reference
9904 MOTOR CTRL
FREQ. The value cannot be
2503 CRIT SPEED 1
9904 MOTOR CTRL
FREQ. The value cannot be
2502 CRIT SPEED 1
LO.
HI.
Def/FbEq
0.00 s
1 = 0.01 s
OFF
0
1
0.0 Hz /
1 rpm
1 = 0.1 Hz
/ 1 rpm
HI).
0.0 Hz /
1 rpm
1 = 0.1 Hz
/ 1 rpm
LO).
0.0 Hz /
1 rpm
1 = 0.1 Hz
/ 1 rpm
0.0 Hz /
1 rpm
1 = 0.1 Hz
/ 1 rpm