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Manual – IPOSplus®
131
12
P92x IPOS monitoring
P9xx IPOS Parameters
12.3 P92x IPOS monitoring
12.3.1 P920/P921 SW limit switch CW/CCW
Setting range: –(2
31
–1) – 0 – 2
31
–1
The software limit switches let the user limit the range in which travel commands are ac-
cepted. This is implemented via software. The limits of the movement range are speci-
fied using these two parameters (software limit switches). If
P941 Source actual position
is set to motor encoder or external encoder, then these do not take effect until after per-
formance of a reference travel. If (page 134) is set to absolute encoder DIP, then these
are effective immediately without reference travel. If the software limit switches are in
effect, the system checks whether the target position H492 of the current travel com-
mand 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 re-
sponds according to the fault response set in P838. If
P838 error response SW limit
switch
is set to "../warning" or ".../fault", then error message "A1.F78" (IPOS SW limit
switch) is generated. The software limit switches are only monitored in the "...& IPOS"
(P700) operating modes.
If
P838 Fault response SW limit switch
is set to ".../Fault", then a drive with incremental
encoder is no longer referenced after a fault reset whereas a drive with absolute encoder
is still referenced.
If the drive is not referenced, the software limit switches have no effect. They are only
activated again after the drive has been referenced.
If
P838 Fault response SW limit switch
is set to ".../Warning", the drive remains refer-
enced following a reset. The drive can move past the target specified due to the mass
moment of inertia of the machine or if the parameter settings are set incorrectly in the
controller. Software limit switches cannot prevent this from happening.
Deactivation:
Set both parameter values to 0 for endless travel so that the software limit
switch function is deactivated.
12.3.2 P922 Position window
Setting range: 0 – 50 – 32 767 Inc
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
inside the position window around the current target position (H492). The "Axis in posi-
tion" information is used as a final condition for waiting positioning commands. It can be
used further as an output terminal function.
12.3.3 P923 Lag error window
Setting range: 0 – 5000 – 2
31
–1 Inc
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 message or lag error re-
sponse will be triggered. You can set the responses with P834 Response to lag error.
Deactivation:
Set value = 0 deactivates lag error monitoring
12.3.4 P924 Positioning interruption detection
Setting range: ON/OFF
This parameter determines whether the positioning process is monitored for interrup-
tions (enable signal revoked). The response is set in
P839 Response to "Positioning in-
terruption
.
P
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f
kVA
Hz
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