ABB ACS880-x04, Firmware Manual

Page: 278 / 604

278 Parameters
31.30 Overspeed trip
margin Defines, together with 30.11 Minimum speed and 30.12
Maximum speed , the maximum allowed speed of the motor
(overspeed protection). If 90.01 Motor speed for control or the
estimated speed exceeds the speed limit defined by
parameter
30.11 or 30.12 by more than the value of this
parameter, the drive trips on the 7310 Overspeed fault.
Example: If the maximum speed is 1420 rpm and speed trip
margin is 300 rpm, the drive trips at 1720 rpm.
500.00 rpm
0.00 … 10000.0
rpm Overspeed trip margin. See par.
46.01
31.32 Emergency ramp
supervision Parameters 31.32 Emergency ramp supervision and 31.33
Emergency ramp supervision delay , together with 01.29
Speed change rate , 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 … 23.19 (Off1)
or 23.23 Emergency stop time (Off3). If the actual
deceleration rate ( 01.29 ) 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 Def / FbEq16
Speed ( 90.01 )
Time
30.12
30.11
31.30
Overspeed trip level
Overspeed trip level
31.30
0