Installation manual

Configuration Mode (ConF)
S1A28692 03/2010 253
Parameters described in this page can be accessed by:
Process overload detected fault
A process overload is detected when the next event occurs and remains pending for a minimum time
[Ovld Time Detect.] (tOL), which is configurable:
• The drive is in current limitation mode.
• The motor is in steady state and the current is above the set overload threshold
[Ovld Detection Thr.] (LOC).
The motor is in steady state when the offset between the frequency reference and motor frequency falls below
the configurable threshold [Hysteresis Freq. Att.] (Srb).
A relay or a logic output can be assigned to the signaling of this detected fault in the
[INPUTS / OUTPUTS CFG] (I_O-) menu.
Code Name / Description Adjustment range Factory setting
FLt- [FAULT MANAGEMENT] (continued)
OLd- [PROCESS OVERLOAD]
tOL [Ovld Time Detect.]
0 to 100 s 0 s
Overload detection time delay.
A value of 0 deactivates the function and makes the other parameters inaccessible.
LOC [Ovld Detection Thr.]
70 to 150% 110%
g
T
(1)
Overload detection threshold, as a % of the rated motor current [Rated mot. current] (nCr) page 74
. This value must be less
than the limit current in order for the function to work.
Srb [Hysteresis Freq.Att.]
0 to 599 Hz 0.3 Hz
g
T
(1)
Maximum deviation between the frequency reference and the motor frequency, which defines steady state operation.
OdL [Ovld.Proces.Mngmt]
[Freewheel] (YES)
g
Behavior on switching to overload detection.
nO
YES
rMP
FSt
[Ignore] (nO): Detected fault ignored
[Freewheel] (YES): Freewheel stop
[Ramp stop] (rMP): Stop on ramp
[Fast stop] (FSt): Fast stop
FtO [Overload T.B.Rest.]
0 to 6 min 0 min
g
T
(1)
This parameter cannot be accessed if [Ovld.Proces.Mngmt] (OdL) is set to [Ignore] (nO).
Minimum time permitted between an overload being detected and any automatic restart.
In order to allow an automatic restart, the value of [Max. restart time] (tAr) page 234
must exceed this parameter by at least
one minute.
FLt- [FAULT MANAGEMENT] (continued)
LFF- [FALLBACK SPEED]
LFF [Fallback speed]
0 to 599 Hz 0 Hz
Selection of the fallback speed.
DRI- > CONF > FULL > FLT- > OLD-
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