REXROTH ECODRIVE03 User Manual

4-8 Description of Diagnostic Messages F… and E… ECODRIVE03-SGP-03VRS
DOK-ECODR3-SGP-03VRS**-WA01-EN-P
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.
Notes: 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
Remedy for:
1. Check S-0-0115, Position feedback 2 type parameter and
S-0-0117, Resolution of feedback 2.
2. Check S-0-0121, S-0-0122, Input/Output revolutions of load gear
and S-0-0123, Feed constant.
3. Increase S-0-0391, Monitoring window feedback 2; switch off when
using a gearbox with a large amount of slip.
4. Replace encoder cable.
5. Reduce the velocity.
6. Set S-0-0391, Monitoring window feedback 2 to 0 (de-activate
monitoring function).
7. Perform P-0-0012, C300 Command 'Set absolute measurement'.
See also the functional description "Actual feedback value monitoring".

REXROTH ECODRIVE03 Specifications

General

Brand	REXROTH
Model	ECODRIVE03
Category	Controller
Language	English