ECODRIVE03-SGP-03VRS Description of Diagnostic Messages B…; C…, D… and A 5-27
DOK-ECODR3-SGP-03VRS**-WA01-EN-P
D902 Motor feedback data not valid
Description:
At the start of the automatic control loop setting (P-0-0162), the motor
parameters
• torque constant
• rated current of unit are read out of the feedback.
Cause:
• One of the above feedback data has a value smaller than or equal to
zero (<=0). This means that the controller parameter is incorrectly
calculated.
• Motor without feedback data storage.
Remedy:
If known, write the correct values back into the parameter or contact
Indramat Customer Service to obtain the feedback data valid for your
motor.
In the worst case, it may be necessary to replace the motor.
See also the functional description:"Automatic Control Loop Settings"
D903 Inertia detection failed
At the start of the automatic control loop setting, the load moment of
inertia is determined with an "oscillation attempt".
This means that the speed change and the motor current must exceed a
minimum value during acceleration or deceleration to guarantee a
sensible and sufficiently precise calculation of the moment of inertia.
Cause:
• drive acceleration too low
• number of measured value too small for automatic control loop setting
• motor speed too low
• load moment of inertia too big
Remedy:
• increase bipolar torque/force value S-0-0092
• increase pos. accel S-0-0260
• increase pos. speed S-0-0259
• increase feedrate override S-0-0108
See also Function description: "Prerequisites for Starting Automatic
Control Loop Settings"
D904 Gain adjustment failed
In exceptional cases, difficulties in the automatic control loop setting may
arise. This means that an automatic setting is not possible. Standard or
default values must therefore be loaded into the drive.
Cause:
• oscillating mechanical systems (resonance)
• high level of interference in the encoder signal
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