ABB ACS880 Firmware Manual page 201

No. Name/Value
31.30 Overspeed trip
margin
0.00 ... 10000.0
rpm
31.32 Emergency ramp
supervision
0...300%
Description
Defines, together with 30.11 Minimum speed
Maximum speed, the maximum allowed speed of the motor
(overspeed protection). If actual speed
for control) 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
WARNING! This function only supervises the speed in
DTC motor control mode. The function is not effective
in scalar motor control mode.
Example: If the maximum speed is 1420 rpm and speed trip
margin is 300 rpm, the drive trips at 1720 rpm.
Speed (90.01)
31.30
0
31.30
Overspeed trip margin.
Parameters 31.32 Emergency ramp supervision
Emergency ramp supervision
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,
maximum allowed deviation from the expected deceleration
rate, which is calculated from parameters
or 23.23 Emergency stop time
deceleration rate (01.29) deviates too much from the
expected rate, the drive trips on
failed, sets bit 8 of 06.17 Drive status word
stop.
If 31.32 is set to 0% and
stop ramp supervision is disabled.
See also parameter 21.04 Emergency stop
Maximum deviation from expected deceleration rate.
and
(90.01 Motor speed
fault.
Overspeed trip level
30.12
30.11
Overspeed trip level
delay, together with
31.32
23.11...23.19
(Off3). If the actual
73B0 Emergency ramp
2, and coasts to a
31.33 is set to 0 s, the emergency
mode.
Parameters 201
Def/FbEq16
30.12 500.00 rpm
Time
See par.
46.01
and 31.33 0%
01.29
defines the
(Off1)
1 = 1%