SEW-Eurodrive MOVIDRIVE compact MCH41A, System Manual

Page: 167 / 436

System Manual – MOVIDRIVE® compact Drive Inverters
167
3
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
Explanation of the parameters
Parameters
P92x IPOS monitoring
P920 / P921 SW
limit switch CW /
CCW Setting range: –(2
31
–1) ... 0 ... 2
31
–1
The software limit switches can be used to limit the target specifications in which travel
commands are accepted. The limits of the movement range are specified 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 performance of a
reference travel. If
P941 Source actual position is set to absolute encoder DIP, it will be
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 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 accord-
ing to the error response set in P838. If
P838 Fault response SW limit switch is set to "...
/ Warning" or "... / Fault", then error message F78 (IPOS SW limit switch) is generated.
The software limit switches can only be monitored in the operating modes "...& IPOS"
(P700) and in the ramp types "linear", "sine" or "square" (P916).
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 to be
referenced 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: Deactivate the software limit switch function for continuous processing by
setting both parameter values to 0.
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.
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
position value. If the permitted value is exceeded, a lag error message or lag error
response will be triggered. You can set the response with P834 Lag error response .
Deactivation: Set value = 0 deactivates lag error monitoring
P93x IPOS
plus®
Special functions
P930 Override Setting range: ON / OFF
The override function makes it possible to change the travel speed for positioning oper-
ations which is programmed in the IPOS
plus®
program. The speed can be altered within
the range from 0 to 150 % of the specifically programmed speed. It requires an analog
input, with 0 to 150 % corresponding to 0 ... 10 V at the analog input. The maximum
speed value is always limited by P302 Maximum speed 1 / P312 Maximum speed 2 .
P6..
P60.
P600