Lenze · 8400 HighLine · Reference manual · DMS 12.0 EN · 06/2017 · TD23 311
5 Motor control (MCTRL)
5.14 Monitoring
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5.14.13 Encoder open-circuit monitoring
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 C00586
is activated (Lenze setting: "Fault").
•The "Sd3: Open circuit - feedback system
" is entered into the Logbook.
•The bMctrlEncoderComFault status output of the LS_DeviceMonitor
SB is set to TRUE.
• A setting of C00586
= "0: No Reaction" deactivates the monitoring.
Related topics:
Encoder/feedback system
( 276)
Note!
In the Lenze setting (C00586 = "1: Fault"), open-circuit monitoring of the encoder is
activated!
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