ABB ACS880 Firmware Manual page 310

310 Parameters
No. Name/Value
31.33 Emergency ramp
supervision delay
0...32767 s
31.35 Main fan fault
function
Fault
Warning
No action
31.36 Aux fan fault bypass
Off
Temporarily
bypassed
31.37 Ramp stop
supervision
0...300%
Description
If parameter 31.32 Emergency ramp supervision
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
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.
Maximum ramp-down time, or supervision activation delay.
Selects how the drive reacts when a main cooling fan fault is
detected.
The drive trips on fault 5080
The drive generates an
No action taken.
(Only visible with a ZCU control unit)
Temporarily suppresses auxiliary fan faults.
Certain drive types (especially those protected to IP55) have
an auxiliary fan built into the front cover as standard. If the
fan is sticking or disconnected, the control program first
generates a warning (A582 Auxiliary fan
fault (5081 Auxiliary fan
If it s required to operate the drive without the front cover (for
example, during commissioning), activate this parameter to
temporarily suppress the fault.
Note:
• Activate the parameter within 2 minutes of rebooting the
control unit, either by cycling the power or with parameter
96.08.
• The parameter only suppresses the fault, not the warning.
• The parameter is in effect until the auxiliary fan is
reconnected and detected, or until the next control unit
reboot.
Normal operation.
The auxiliary fan fault indication is temporarily suppressed.
The setting will revert automatically to Off.
Parameters 31.37 Ramp stop supervision
stop supervision delay, together with
rate, provide a supervision function for normal (i.e. non-
emergency) ramp stopping.
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 31.38. Otherwise,
maximum allowed deviation from the expected deceleration
rate, which is calculated from parameters 23.11...23.19. If
the actual deceleration rate (01.29) deviates too much from
the expected rate, the drive trips on
bit 14 of 06.17 Drive status word
If 31.37 is set to 0% and
supervision is disabled.
Maximum deviation from expected deceleration rate.
failed, sets bit 8 of 06.17 Drive
Fan.
A581 Fan warning.
missing), then a
broken).
and 31.38 Ramp
01.29 Speed change
31.37
73B1 Stop failed, sets
2, and coasts to a stop.
31.38 is set to 0 s, the ramp stop
Def/FbEq16
is set to 0 s
1 = 1 s
Fault
0
1
2
Off
0
1
0%
defines the
1 = 1%