Lenze 8400 motec Series, Software Manual, Page: 129 / 376

Firmware
≤
02.00 - DMS 2.1 EN - 03/2011
L
129
8400 motec | Software Manual
Motor control (MCTRL)
Monitoring
5.13.6 Encoder open-circuit monitoring
This function extension is available from version 02.00.00!
When does the open-circuit monitoring respond?
Open-circuit monitoring responds if

there is an open circuit in the encoder cable.

during the starting phase of the motor, an extreme overload occurs (e.g. blocked motor
shaft).

the motor is reversed highly dynamically.
Which measured values cause open-circuit monitoring?
The following measured values checked for plausibility cause open-circuit monitoring:
1. If for a time > 0.2 s, the amount of deviation between the actual speed value and the
speed setpoint is higher than f = 40 Hz.
2. If for a time > 0.2 s, the detected actual speed value is f = 0 Hz or n = 0 rpm and the I
max
controller is active at the same time.
3. If for a time > 0.2 s, the injected frequency and the actual speed value have different
signs and the I
max
controller is active at the same time. This is usually the case if A/B
tracks are mixed up.
Response to open circuit

If open-circuit monitoring responds:
– The error response set in
C00586 will be carried out (Lenze setting: "Fault").
– The " SD3: Open circuit feedback system " error message is entered into the logbook.

A setting of C00586 = "0: No Reaction" deactivates the monitoring.
Related topics:
Encoder/feedback system
(

107)

Note!
In the Lenze setting ( C00586 = "1: Fault), encoder open-circuit monitoring is
activated.