2 open-circuit monitoring htl encoder, Open-circuit monitoring htl encoder, 6encoder/feedback system – Lenze 8400 TopLine User Manual
Page 370
6
Encoder/feedback system
6.7
Monitoring
370
Lenze · 8400 TopLine · Reference manual · DMS 6.0 EN · 06/2014 · TD05/TD14
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6.7.2
Open-circuit monitoring HTL encoder
Open-circuit monitoring is available for the HTL encoder cable.
When does the open-circuit monitoring system respond?
The open-circuit monitoring will trigger if
• an open circuit occurs in the encoder cable.
• an extreme overload (e.g. blocked motor shaft) occurs during the start-up phase of the motor.
• highly dynamic reversion of the motor occurs.
• the motor still rotates at high speed in the "SC servo control ASM" mode when the controller
enabled.
Which measured values lead to an actuation of the open-circuit monitoring system?
The following measured values checked for plausibility lead to an actuation of the open-circuit
monitoring system:
1. If the total deviation between actual speed and setpoint speed is higher than f = 40 Hz for a time
> 0.1 s .
2. If the actual speed detected is f = 0 Hz or n = 0 rpm and the I
max
controller or the torque
limitation for servo control (SC) is active for t ≥ 0.1 s.
3. If the sign of the injected frequency and the actual speed is not the same, the I
max
controller is
active and this status is active for 0.1 s. Usually this is the case when A/B tracks are reversed.
Response to open circuit
• If the open-circuit monitoring is tripped:
• The error response set in
is activated (Lenze setting: "Fault").
• The "
Sd3: Open circuit - feedback system
" is entered into the Logbook.
• The bMctrlEncoderComFault status output of the
SB is set to TRUE.
• A setting of
= "0: No Reaction" deactivates the monitoring.
Danger!
For safety reasons, always select "Fault" (Lenze setting) as a response for the (open-
circuit) monitoring of the HTL encoder!
Note!
If you do not use an HTL encoder, deactivate the monitoring (