Monitoring Functions; Following Error Monitoring System - Lenze 8400 Software Manual

4 Detailed functions of the technology application
4.4

Monitoring functions

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4.4 Monitoring functions
4.4.1

Following error monitoring system

The difference between set position and actual position is called the following error. Ideally, the
following error should be "0". The set position is created by the internal definition of the traversing
profiles of the Motion Control Kernel. The actual position is created by the integration of the speed
supplied by the position encoder. The following error is always compensated dynamically. With an
optimum setting of the position control, only a minimum following error occurs which does not
increase continuously.
Certain processes, however, require that a defined limit as a difference between set position and
actual position is not exceeded. If it is exceeded, it may have been caused by a mechanical blocking
in the machine and the system part is not situated at the position defined at that time. In such a
case, it makes sense to activate the "Fault" error response to make the motor torqueless.
In the 8400 TopLine controller, two independent following error monitoring systems can be
parameterised:
[4-1] Two-channel following error monitoring system
Parameter
(Block)
C01215/1
(LS_MotionControl
Kernel)
C01215/2
(LS_MotionControl
Kernel)
C01244/2...3
(LS_MotionControl
Kernel)
C00595/5...6
(LS_SetError_1)
Lenze · 8400 "Position Sequencer" technology application · Software manual · DMS 1.0 EN · 07/2014 · TD05
Possible settings
0.0001 units 214748.3647 Limit for following error monitoring 1
Lenze setting: 5.0000 units
0.0001 units 214748.3647 Limit for following error monitoring 2
Lenze setting: 10.0000 units
0 ms
Lenze setting: 0 ms
0 No Reaction
1 Fault
3 TroubleQuickStop
4 WarningLocked
5 Warning
6 Information
Info
• The setting "0" deactivates following error
monitoring 1
• The setting "0" deactivates following error
monitoring 2
60000 Waiting time for following error monitoring 1 & 2
• In order to avoid that an error is triggered by
acceleration and a narrow tolerance limit can be
nevertheless monitored at standstill in the target,
the response of the following error monitoring
system can be delayed by setting a waiting time.
Response at the activation of following error
monitoring
• Subcode 5: response at the activation of following
error monitoring 1.
• Subcode 6: response at the activation of following
error monitoring 2.
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