reference marks will the system determine, based on
PeriodLen
> 0, that the
encoder system is linear and not rotary.
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P 555[0] - ENC_CH1_Info
= Encoder Information
This parameter is available to the user so that they can enter a text of their
choice (maximum of 31 characters). This text should be used to describe the
encoder on channel Ch1
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P 616[0] - ENC_CH1_CycleCount
= Sampling cycle in: n x 125 µs
(microseconds)
The CycleCount parameter can be used to slow down the timing for the
cyclical SSI encoder evaluation. By default, CycleCount = 1, i.e. the default
setting corresponds to 125 µs sampling and cycles for the encoder
evaluation. Different settings must be viewed as special cases and
accordingly must only be used when necessary. (see Section "SSI
(cyclical) X7" on page 70).
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P 610[0] - ENC_CH1_NominalIncrementA
= distance coded absolute
encoder
P 611[0] - ENC_CH1_NominalIncrementB
= distance coded absolute
encoder
The
NominalIncrementA
and
NominalIncrementB
parameters make it
possible to run SinCos incremental encoders (without an absolute value
interface) with analogue distance-coded reference marks. For example, if
you were using the Heidenhain ROD280C with 18000 SinCos tracks per
revolution and 36 distance-coded reference marks, you would need to set
NominalIncrementA to 1000 signal periods and NominalIncrementB to 1001
signal periods. This functionality is enabled if
NominalIncrementA
> 0. (see
Section "Increment-coded reference marks" on page 107).
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P 617[0] - ENC_CH1_AbsInitMode
= Mode absolute value formation
AbsInitMode
can be used to select various possible settings for the absolute
value initialization:
o
DIG_ANA(0)- Standard:
Absolute value initialization using a mix of the digital and analogue
components (this is the default mode)
ID No.: 0842.26B.5-01 Date: 09.2020
ServoOne - Device Help
68
6 Encoder
o
DIG(1) - Digital:
Only the digital component will be used for the absolute value
initialization.
o
SEK_SEL37(2) - Automatic:
Digital if ST bits > (Li 8); otherwise standard (criterion applies
with HIPERFACE SEKL-37 encoders)
o
SSI_180(3) - Same as Standard, except:
In the case of SSI, the quadrant alignment of the digital value relative
to the analogue SinCos tracks is not the same as with EnDat, but is
instead offset by 180 degrees relative to EnDat, i.e. in the “natural Q
alignment” for the digital value relative to the tracks.
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P 1900[0] - ENC_ETS
= ETS mode, electronic nameplate
The parameter ENC_ETS supports what is referred to as the “KEBA
electronic rating plate” for HIPERFACE encoders. If this parameter is set to
SCAN(0), the motor’s commutation offset will be read from the encoder’s
OEM memory and copied to
P 349 - CON_FM_MConOffset
, but only if this
offset can be unambiguously identified in the encoder (encoder memory
scanning). If the parameter is set to NEVER(0) instead, this functionality will
be disabled.
6.5.5.2.5 SSI absolute value interface
If P 540[0] - ENC_CH1_Abs = SSI(1), which is the normal setting, the absolute SSI
encoder position will be read once during the initialization phase; after this, the
cyclical encoder position will be acquired based on the SinCos incremental
component.
The parameters for the SSI interface are described in Section "SSI (cyclical) X7" on
page 70, as are the differences in using the SSI interface with the “cyclical” method
and “one-time reading” method.
If P 540[0] - ENC_CH1_Abs = SSI_CONT(4), which is a special case, the absolute
SSI encoder position will be read once during the initialization phase; after this, the
cyclical encoder position will be acquired based on the SinCos incremental