Lenze 931E/K Small Drives Control - Manual (Page 123)

Troubleshooting and fault elimination
Error monitorings in the 931E/K
Monitoring the motor
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123 SW−HB 13.0002−EN 4.1
9.1.5 Monitoring the motor
ƒ Rotary encoder monitoring:
When a rotary encoder error occurs, the power stage will be switched off. When a
resolver is used, the track signal will be monitored. Other "intelligent" encoders are
equipped with other error detections.
ƒ Motor temperature measurement and monitoring:
The 931E/K servo positioning controller is equipped with an analog input for the
detection and monitoring of the motor temperature. Through the analog signal
detection, non−linear sensors will also be supported. The switch−off temperature can
be parameterised. As an alternative, an NC contact or PTC can be used to monitor the
motor temperature. In this case, the switch−off threshold can, however, not be
parameterised.
ƒ I 2 T current monitoring with warning for the motor:
The 931E/K servo positioning controller is also equipped with an I 2 t−monitoring to limit
the average power loss in the motor. Since the power loss in the power electronics and
in the motor will in the worst case increase square−law with the flowing current, the
squared current value will be used to measure the power loss. When reaching 80 % of
the maximum integrated measurand, a warning (parameterisable) will be activated.
When reaching 100 %, the maximum current will be limited to the rated current.
ƒ Automatic motor identification monitoring:
Monitors the automatic identification of the phase sequence, pole pair number and
angle encoder offset.
9.1.6 Monitoring the sequence of motions
ƒ Following error:
Monitoring the difference between setpoint and actual position.
ƒ Positioning range:
Monitoring whether a currently active positioning process is within a selectable
positioning range.
ƒ Limit switches:
If both limit switches are active at the same time, an error will be generated.
ƒ Course program:
Monitoring whether invalid commands occur when editing of the course program.