ABB ACS880 Series Firmware Manual page 262

262 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
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
Emergency ramp failed, sets bit 8 of
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
(5081 Auxiliary fan broken).
If it is necessary to operate the drive without the front cover
(for example, during commissioning), this parameter can be
activated to temporarily suppress the fault.
Notes:
• The parameter must be activated within 2 minutes of
control unit reboot (either by cycling the power or by
parameter 96.08).
• The parameter only suppresses the fault, not the warning.
• The parameter will be 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 (ie. 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
of 06.17 Drive status word
If 31.32 is set to 0% and
supervision is disabled.
Maximum deviation from expected deceleration rate.
06.17 Drive status word
Fan.
A581 Fan warning.
missing), then a fault
and 31.38 Ramp
01.29 Speed change
31.37
73B1 Stop failed, sets bit 14
2, and coasts to a stop.
31.33 is set to 0 s, the ramp stop
Def/FbEq16
is set to 0%, 0 s
73B0
1 = 1 s
Fault
0
1
2
Off
0
1
0%
defines the
1 = 1%