Installation manual

Configuration Mode (ConF)
248 S1A28692 03/2010
Parameters described in this page can be accessed by:
Load variation detection
This detection is only possible with the High-speed hoisting function. It can be used to detect if an obstacle
has been reached, triggering a sudden (upward) increase or (downward) decrease in the load.
Load variation detection triggers a [Dynamic load fault] (dLF). The [Dyn. load Mgt.] (dLb) parameter can
be used to configure the response of the drive in the event of this detected fault.
Load variation detection can also be assigned to a relay or a logic output.
There are two possible detection modes, depending on the configuration of high-speed hoisting:
• Speed reference mode
[High speed hoisting] (HSO) page 190 is set to [Speed ref] (SSO).
Torque variation detection.
During high-speed operation, the load is compared to that measured during the speed step. The
permissible load variation and its duration can be configured. If exceeded, the drive switches to fault mode.
• Current limitation mode
[High speed hoisting] (HSO) page 190 is set to [Current Limit] (CSO).
On ascend, during high-speed operation, an increase in load will result in a drop in speed. Even if high-
speed operation has been activated, if the motor frequency drops below the [I Limit Frequency] (SCL)
threshold page 190
, the drive will switch to fault mode. The detection is realised only for a positive variation
of the load and only in the high speed area (area upper to [I Limit Frequency] (SCL)).
On descend, operation takes the form of Speed reference mode.
Code Name / Description Adjustment range Factory setting
FLt- [FAULT MANAGEMENT] (continued)
dLd- [DYNAMIC LOAD DETECT.]
Load variation detection. This can be accessed if [High speed hoisting] (HSO) page 190 is not [No] (nO).
tLd [Dynamic load time]
[No] (nO)
nO
-
Activation of load variation detection and adjustment of time delay for taking load variation detected fault
[Dynamic load fault] (dLF) into account.
[No] (nO): No load variation detection
0.00 s to 10.00 s: Adjustment of the time delay for taking detected fault into account.
dLd [Dynamic load threshold]
1 to 100% 100%
Adjustment of the trip threshold for load variation detection, as a % of the load measured during the speed step.
dLb [Dyn. load Mgt.]
[Freewheel] (YES)
nO
YES
Stt
LFF
rLS
rMP
FSt
Behavior of the drive in the event of a load variation detected fault.
[Ignore] (nO): Detected fault ignored
[Freewheel] (YES): Freewheel stop
[Per STT] (Stt): Stop according to configuration of [Type of stop] (Stt) page 158
, without tripping. In this case, the fault
relay does not open and the drive is ready to restart as soon as the detected fault disappears, according to the restart conditions
of the active command channel, (for example, according to [2/3 wire control] (tCC) and [2 wire type] (tCt) page
112 if
control is via the terminals). Configuring an alarm for this detected fault is recommended (assigned to a logic output, for example)
in order to indicate the cause of the stop
[Fallback spd.] (LFF): Change to fallback speed, maintained as long as the detected fault persists and the run command has
not been removed (1)
[Spd maint.] (rLS): The drive maintains the speed at the time the detected fault occurred, as long as the detected fault persists
and the run command has not been removed (1)
[Ramp stop] (rMP): Stop on ramp
[Fast stop] (FSt): Fast stop
DRI- > CONF > FULL > FLT- > DLD-
Courtesy of Steven Engineering, Inc.-230 Ryan Way, South San Francisco, CA 94080-6370-Main Office: [phone]-Outside Local Area: [phone]-www.stevenengineering.com