ABB ACS180 - Page 212

212 Parameters
31.31 Frequency trip margin Defines, together with 30.13 Minimum frequency and
30.14 Maximum frequency, the maximum allowed
frequency of the motor (overfrequency protection). The
absolute value of this overfrequency trip level is calculated
by adding the value of this parameter to the higher of the
absolute values of 30.13 Minimum frequency and 30.14
Maximum frequency.
If the output frequency (01.06 Output frequency) exceeds
the overfrequency trip level (ie. the absolute value of the
output frequency exceeds the absolute value of the
overfrequency trip level), the drive trips on the 73F0
Overfrequency fault.
15.00 Hz
0.00…10000.00 Hz Overfrequency trip margin. See par.
46.02
31.32 Emergency ramp
supervision
Parameters 31.32 Emergency ramp supervision and
31.33 Emergency ramp supervision delay, together with
the derivative of 24.02 Used speed feedback, provide a
supervision function for emergency stop modes Off1 and
Off3.
The supervision is based on either
• observing the time within which the motor stops, or
• comparing the actual and expected deceleration rates.
If this parameter is set to 0%, the maximum stop time is
directly set in parameter 31.33. Otherwise, 31.32 defines
the maximum allowed deviation from the expected
deceleration rate, which is calculated from parameters
23.11… 23.15 (Off1) or 23.23 Emergency stop time (Off3).
If the actual deceleration rate (24.02) deviates too much
from the expected rate, the drive trips on 73B0
Emergency ramp failed, sets bit 8 of 06.17 Drive status
word 2, and coasts to a stop.
If 31.32 is set to 0% and 31.33 is set to 0 s, the
emergency stop ramp supervision is disabled.
See also parameter 21.04 Emergency stop mode.
0%
0…300% Maximum deviation from expected deceleration rate. 1 = 1%
No. Name/Value Description Default
FbEq 16
Frequency
Time
30.14
30.13
31.31
Overfrequency trip level
Overfrequency trip level
ABS(30.14)
ABS(30.14)
31.31
ACS180 FW.book Page 212 Tuesday, March 9, 2021 2:25 PM