8400 StateLine C | Reference manual
Motor control (MCTRL)
Monitoring
244 L Firmware ≤ 11.00 - DMS 8.0 EN - 10/2011
5.12.11 Encoder open-circuit monitoring
When does the open-circuit monitoring system respond?
The open-circuit monitoring function responds 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.
the motor is highly dynamically reversed.
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 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
( 217)
Note!
In the Lenze setting (C00586 = "1: Fault), the open-circuit monitoring of the
encoder is activated.
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