The d/q current values are now calculated and the small table is filled with the
results.
Afterwards, access to the table entries of the respective table field is possible.
The small table is not saved to the controller’s ROM. Instead, it is re-calculated when
the servo drive is started or a re-initialization takes place and the results are saved to
RAM.
7.7.5.2 Parameter interface for accessing the d/q current values
of the LUT
Access to the values of the LUT can be carried out via parameters P 421, P 422 and
P423:
Selecting the small table:
Parameter P 421[2] - CON_FM_FW_TabIdx[2].Table select = 0 (internal LUT).
Selecting the large table:
Parameter P 421[2] - CON_FM_FW_TabIdx[2].Table select = 1 (external LUT).
Selecting the index for the speed:
Parameter P 421[0] - CON_FM_FW_TabIdx[0].Speed index select.
Selecting the index for the torque:
Parameter P 421[1] - CON_FM_FW_TabIdx[1].Torque index select.
Table value of the LUT for the d current:
Parameter P 422[0] - CON_FM_FW_TabId - Id in A.
Table value of the LUT for the q current:
Parameter P 423[0] - CON_FM_FW_TabIq - Iq in A.
MOOG
ID No.: CB40859-001 Date: 11/2020
MSD Servo Drive - Device Help
153
7 Control
ID
Index Name / Setting
Description
Unit
P 421
CON_FM_FWTabIdx
P 421
0
Speed index select
Selects index for speed
P 421
1
Torque index select
Selects index for torque
P 421
2
Table select
0: Selects small table
1: Selects large table
P421
3
Command
0: None
1: ClearTable
2: WriteToRom
P 422
CON_FM_FWTabId
d current table entry
A
P423
CON_FM_FWTabIq
q current table entry
A
Table 7.34: Parameter interface for accessing the LUT
The large table is not generated in the servo drive. It must be provided to the servo
drive from an external source (referred to as an “external LUT”). This can be
accomplished via the parameter interface described here.
see also section "Internal calculation of the small table" on
NOTE
l
During the internal calculation of the small table, only map fields
for positive speeds and torques are calculated.
7.7.5.3 Saving the large table to ROM
The large table can be transferred from the volatile RAM memory of the device to the
non-volatile FLASH memory in the servo drive in two ways. The next time the device
is started up, the reverse process is then carried out so that the large table is
available immediately.
A.) Save the parameters, for example via Moog D
RIVE
A
DMINISTRATOR
5 (MDA5)
