Etel DSC2P - Advanced Communication

Operation & Software Manual
206
Direct Drives & Systems
Chapter C: System functions ETEL Doc. - Operation & Software Manual # DSC2P 903 / Ver. F / 3/6/05
13.12 Advanced communication
13.12.1 Synchronization
The synchronization is given by the TEB synchro signal present on the Turbo-ETEL-Bus (TEB). This signal
allows several daisy-chained controllers to be synchronized to the same reference.
• For the DSC2P/DSC2V: the TEB synchro signal frequency is equal to 1/sti (1/sti = 1/166,67µs = 6 kHz).
• For the DSCDP, DSCDL and DSCDM: the TEB synchro signal frequency is equal to 6kHz but the DSCDP,
DSCDL and DSCDM works at 1/sti (1/sti = 1/500µs = 2 kHz).
Remark: The synchro signal can also come from the Macro bus if a Macro optional board is installed on the
controller. In this case, the working frequency of the controller is given by parameter
K88. In Macro
mode, parameter K87 does not work like described below (refer to the ’DSO-MAC User's
Manual’ for more information).
The synchronization is necessary when the controller is in slave mode, receiving its reference from the master
(DSMAX, DSTEB or µ-master) through the TEB. It is applied to:
• PWM (simultaneous commutation of power IGBTs)
• All the process of the controllers: reading of position reference coming from the DSMAX (interpolated
mode)
The controller synchronization mode is set by parameter K87. It defines if the controller should be
synchronized, and how.
Bits# 0 to 7 define the synchronization frequency of the controller:
Remark: With a TEB communication, parameter K87 must be equal to 0 or 1 for the bits ranging from 0 to 7.
For the DSCDP, DSCDL and DSCDM, if parameter K87 is modified, the SAV command must be
executed on the both axes.
Available on DSC2P DSC2V DSCDP DSCDL DSCDM
K Name Bit # <p1> Comment
K87
Controller
synchronization
0 - 7 Synchronization frequency = (1/sti) / <p1>
8 - 11 Synchronization delay
Controller
TEB
K87 value Comment
DSC2P
DSC2V
0 The controller is not synchronized
The optimal value for the DSC2P and DSC2V is K87 = 1
1 The controller is synchronized at 6 kHz
2 The controller is synchronized at 3 kHz
3 The controller is synchronized at 2 kHz
...
DSCDP
DSCDL
DSCDM
0 The controller is not synchronized
The optimal value for the DSCDP, DSCDL and DSCDM is
K87 = 257
1 The controller is synchronized at 2 kHz
2 The controller is synchronized at 1 kHz
3 The controller is synchronized at 500 Hz
...