ECODRIVE03-SGP-03VRS Description of Diagnostic Messages F… and E… 4-9
DOK-ECODR3-SGP-03VRS**-WA01-EN-P
F237 Excessive position command difference
Cause:
When the drive is operating in position control, incoming position
command values are monitored. If the velocity required of the drive by two
successive position command values is greater than or equal to the value
in S-0-0091, Bipolar velocity limit value, position command value
monitoring is initiated. The Excessive position command value is
stored in parameter P-0-0010. The last valid position command value
is stored in parameter P-0-0011.
If position data are to be processed in modulo format, then the
interpretation of the command is also dependent on the value set in S-0-
0393, Command value mode for modulo format. The parameter
should be set for the "shortest path" (0).
Remedy:
Compare S-0-0091, Bipolar velocity limit value with the velocity in the
program and adjust to match it, if necessary.
F242 Encoder 2 failure: signal amplitude wrong
Cause:
The analog signals of the measuring system are monitored according to
two criteria:
1. The pointer length of the amplified signals, which is calculated
from the sine and cosine signals, must be > 1 V.
2. The maximum pointer length resulting from the sine and cosine
signals must not exceed 11.8 V.
pointer length = sin + cos
22
Fig. 4-2: Pointer length
To check this, it is possible to transmit the encoder signals to the analog
output of the controller. This is done by means of the following parameter
setting:
Channel 1:
P-0-0420 = 0; P-0-0421 = 3 (sine encoder 2); P-0-0422 = 1.0
Channel 2:
P-0-0423 = 0; P-0-0424 = 4 (cosine encoder 2); P-0-0422 = 1.0
By means of the input amplifiers, the 1 Vpp encoder signal is amplified to
the nominal pointer length of 0.5V * 15.0 = 7.5V and output. With the
corresponding setting (X-Y operation) of the oscilloscope, you will obtain
the following signal shape.
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