ABB ACS880 Series, Firmware Manual

Page: 374 / 764

Def / Type
FbEq 16b / 32b Description Name / Range /
Selection No.
- / 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 %
- / real32 If parameter 31.32 Emergency ramp supervision is set
to 0%, this parameter defines the maximum time an
emergency stop (mode Off1 or Off3) is allowed to take.
If the motor has not stopped when the time elapses,
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 a value other than 0%, this parameter
defines a delay between the receipt of the emergency
stop command and the activation of the supervision.
It is recommended to specify a short delay to allow the
speed change rate to stabilize.
Emergency ramp
supervision delay 31.33
1 = 1 s / 1 = 1 s Maximum ramp-down time, or supervision activation
delay. 0...32767 s
374 Parameters