SEW-Eurodrive MOVIPRO SDC Manual page 127

P92x IPOS monitoring
P920/P921 SW Setting range: −(2
limit switch CW/
The software limit switches let the user limit the range in which travel commands are ac-
CCW
cepted. This is implemented via software. The limits of the movement range are speci-
fied using these two parameters. If P941 Source actual position (page 129) is set to "mo-
tor encoder" or "external encoder", then these do not take effect until after performance
of a reference travel. If the software limit switches are in effect, the system checks
whether the target position H492 of the current travel command is beyond the software
limit switches. If the target position is beyond the range limited by the limit switches, the
travel command will not be executed. The drive responds according to the fault re-
sponse set in P838 Fault response to SW limit switch (page 118). If P838 is set to "../
warning" or ".../fault", then fault message "A1.F78" (IPOS SW limit switch) is generated.
The software limit switches are only monitored in the "...& IPOS" operating modes.
If P838 is set to ".../fault", then the drive with incremental encoder is no longer refer-
enced after a fault reset whereas a drive with absolute encoder is still referenced.
If the drive is not referenced, the software limit switches are inactive until the drive has
been referenced again.
If P838 is set to ".../warning", the drive will remain referenced after the reset. The target
might be overshot due to the mass moment of inertia of the machine or incorrectly set
controller parameters. The software limit switches do not respond in this case.
Deactivation: Set both parameter values to 0 for endless travel so that the software limit
switch function is deactivated.
P922 Position win- Setting range: 0 – 50 – 32 767 incr.
dow
The parameter defines a distance range (position window) around the target position of
a travel or stop command. The "Axis in position = Yes" condition applies if a drive is in-
side the position window around the current target position (H492). The "Axis in position"
information is used as a final condition for waiting positioning commands.
P923 Lag error Setting range: 0 – 5000 – 2
window
The lag error window defines a permitted difference between the setpoint and actual po-
sition value. If the permitted value is exceeded, a lag error response will be triggered.
You can set the responses with P834 Response to lag error (page 118).
Deactivation: Set value = 0 deactivates lag error monitoring
P924 Positioning Setting range: On/off
interruption detec-
This parameter determines whether the positioning process is monitored for interrup-
tion
tions (enable signal revoked). The response is set in P839 Response to "Positioning in-
terruption" (page 118).
Manual – MOVIPRO® SDC with DeviceNet Interface
Parameterization of MOVIPRO
Explanation of the parameters
31 31
−1) – 0 – (2 −1)
31
–1 incr.
®
I
10
0 0
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