3-8 Description of diagnostic letters F... and E... ECODRIVE03 SMT-02VRS
DOK-ECODR3-SMT-02VRS**-WA01-EN-P
Cause:
Maximum speed of the feedback device is lower than the maximum
motor speed.
Suggestion:
•
Don’t allow the motor to run faster than the maximum allowed sensor
speed by reducing parameter S-0-0091, Bipolar Speed Limit.
•
Change the sensor for a device with higher speed rating.
F236 Excessive position feedback difference
Cause:
In the communication phase 4 transition check command, position
feedback value 1 and position feedback value 2 are set to the same
value, and the cyclic evaluation of both encoders is started. In cyclic
operation (phase 4), the position feedback difference of both encoders is
compared with S-0-0391, Monitoring window feedback 2. If the
amount of the difference exceeds the monitoring window, the error F236
Excessive position feedback difference is diagnosed, the parameter-
selected error response is performed, and the reference bits of both
encoders are cleared.
Note: The monitoring is off, when the parameter S-0-0391,
Monitoring window feedback 2 is set to the value 0.
Possible Causes :
1. Incorrect parameter for the encoder 2
(S-0-0115, Position feedback 2 type parameter,
S-0-0117, Resolution of feedback 2)
2. Incorrect parameter setting of mechanical system between motor
shaft and encoder 2:
(S-0-0121, Input revolutions of load gear,
S-0-0122, Output revolutions of load gear,
S-0-0123, Feed constant)
3. The mechanical system between motor shaft and encoder 2 is not
rigid (e.g. gear play, slip).
4. Defective encoder cable
5. Maximum input frequency of the encoder interface exceeded
6. Encoder 2 (optional) is not mounted to the driven axis.
7. Incorrect reference measure of an absolute encoder
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