Once the setpoint source is selected, the process controller setpoint can be set with
P 2666[0] - CON_PRC_REFVAL. This setpoint can then be scaled further with
P 2667[0] - CON_PRC_REFSCALE in order, for example, to incorporate decimal
places and/or unit conversions.
7.10.2.3 Actual values
The process control circuit actual value can be selected via a number of pre-defined
actual value sources. P 2668[0] - CON_PRC_ACTSEL can be used to select these
actual value sources.
Setting
Name
Description
0
ANA0
Analog input ISA00 (CON_ANA_Isaf[0])
1
ANA1
Analog input ISA01 (CON_ANA_Isaf[1])
2
FIELDBUS
CON_PRC_ACTVAL_FIELDBUS P 2677
3
ENC_DATA_
REFVEL
Current speed from encoder for
unfiltered speed control
4
ENC_DATA_
REFPOS
Current position from encoder for
unfiltered speed control
5
ISQREF_SCON
Current current reference value from
speed controller
6
Reserved
Special hardware required
7
Reserved
Special hardware required
8
ANA_ALL
Any analog input (function selector for
analog inputs set to a value of -14)
Table 7.3
5
: Selector for actual value (
P 2668[0]
)
MOOG
ID
No.:
CB40859-001
Date:
02/2018
MSD Servo Drive - Device Help
156
7 Control
Setting
Name
Description
11
SPEED
Speed in user units
12
POS
Position in user units
13
P2981
Mappable parameter P-2981
14
P2982
Mappable parameter P-2982
15
P2983
Mappable parameter P-2983
16
P2984
Mappable parameter P-2984
Table 7.3
5
: Selector for actual value (
P 2668[0]
) (continue)
The selected actual value will be output in P 2673[0] - CON_PRC_RAW_ACTVAL.
In addition, a configurable offset, P 2669[0] - CON_PRC_ACTOFFSET, can be
superimposed on the actual value. The actual value can be smoothed with a
configurable PT-1 filter. To use this option, the user can use P 2670[0]- CON_PRC_
ACTTF to set a reset time in milliseconds. If the reset time is set to 0 ms, the filter will
be disabled. Moreover, the filtered actual value can be scaled with P 2671[0] -
CON_PRC_ACTSCALE in order to incorporate decimal places or unit conversions.
The resulting actual value for the process controller will be indicated in P 2674[0] -
CON_PRC_ACTVAL.
7.10.2.4 PI process controller
Deviation P 2675[0] - CON_PRC_CDIFF will be the difference between the scaled
process controller setpoint and the scaled and filtered actual value. The sign for this
deviation can be inverted with P 2665[0] - CON_PRC_CDIFF_SIGN (CON_PRC_
CDIFF_SIGN = -1).