Lenze Drive PLC Developer Studio 9300 Servo PLC (V8.x) - Manual (Page 96)

2.12 MCTRL_MotorControl (node number 131)
9300 Servo PLC
System blocks
2−82
L
9300 Servo PLC EN 5.0
2.12.17.18 nErr − speed monitoring (speed out of tolerance margin)
This monitoring function compares the actual speed value supplied by the speed encoder to the
speed setpoint on the speed controller. If the difference between the two speed values exceeds the
tolerance margin set in C0576, the monitoring function is actuated.
Error Monitoring function System variable Possible responses
No. Display TRIP Message Warning FAIL−QSP Off
x190 nErr Speed out of tolerance margin MCTRL_bSpeedLoopFault_b ь ь ь ь ·
· Lenze setting
ü Setting possible
This monitoring function can be used to evaluate the speed following behaviour of the controller.
·
If the system deviation exceeds a certain value, this may indicate a drive problem. In this case,
the drive cannot follow the set speed setpoint for some reason. With operational controllers,
this may be caused by mechanical blockades on the load side, or by an insufficient motor
torque.
Furthermore, this monitoring function can be used for additional speed encoder protection in
speed−controlled operation. This monitoring function thus supplements the individual encoder
monitoring functions.
·
Errors on the encoder system bring about an incorrect actual speed value. This usually results
in a system deviation on the speed controller that is greater than that during normal operation.
·
The tolerance margin is set via C0576:
·
The response is set via C0579:
Code LCD Possible settings IMPORTANT
Lenze Selection
C0576 nErr Window 100 Tolerance margin for speed
monitoring
·
Referred to n
max
.
·
100 % = lowest monitoring
sensitivity.
0 {1 %} 100
C0579 MONIT nErr 3 Speed monitoring configuration
0 TRIP
1 Message
2 Warning
3 Off
4 FAIL−QSP
Note!
·
If the encoder is to be monitored, set the error response to "TRIP".
·
To ensure that there are no false alarms, it might be necessary to adapt the setpoint/quick
stop ramps (by means of longer time intervals) to the application.
·
The selected tolerance margin (C0576) should be at least twice as high as the system
deviation occurring during operation. The deviation can be determined by means of
appropriate tests during commissioning.