ABB ACS880 - Page 337

Def / Type
FbEq 16b / 32b
DescriptionName / Range /
Selection
No.
500.00 rpm / real32
Defines, together with 30.11 Minimum speed and 30.12
Maximum speed, the maximum allowed speed of the motor
(overspeed protection). If 90.1 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.
Example: If the maximum speed is 1420 rpm and speed
trip margin is 300 rpm, the drive trips at 1720 rpm.
Speed (90.01)
Time
Overspeed trip level
(31.30)
(30.12)
(30.11)
(31.30)
Overspeed trip level
0
Overspeed trip margin31.30
- / -
Overspeed trip margin. For scaling, see parameter 46.1.
0.00 ... 10000.00 rpm
- / real32
Parameters 31.32 Emergency ramp supervision and 31.33
Emergency ramp supervision delay, together with 1.29
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 (1.29) deviates too much
from the expected rate, the drive trips on 73B0 Emergency
ramp failed, sets bit 8 of 6.17 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.
Emergency ramp
supervision
31.32
1 = 1 % / 0 = 1 %Maximum deviation from expected deceleration rate.0...300 %
Parameters 337