Hi,
I am Trying to use the Ext-IA-FB and Ext-IB-FB pins 19 and 69 of DIM100 for measuring some analog signals.
I removed the R133 and R134 resistance in the DRV kit ( refering schematic drawing RevD of DV8301), and I made the analog outputs to float.
Now I downloded my software which is configured to read Ext-IA-FB and Ext-IB-FB instead of IA-FB and IB-FB.
by replacing ADCselect group1 with 0x00444000 instead of 0x00240200. I have not done anyother modification in the code.
Now ADC1group 1 is configured for
1.Ext-IA-FB ADC ( AD1IN14 in TMS570 control card)
2.VDCBUS (AD1IN18 in TMS570 control card)
3. Ext-IB-FB (AD1IN22 in TMS570 control card)
My problem:
Once I give Motor Enable command,
The TP24 - GND and TP 25 -GND is measuring 1.3 V . ( but i didnt connected any input to that terminal)
Is it possible that a analog output in float will measure some voltage.?
Also when I grounded TP25, Ext-IA-FB is reading zero. but VDCBUS measurement in (Pin11 of DIM100) is also affecting ( that is count in the register of VDCBUS is also varied), but in actual the PVDD supply is stable.
Could you please suggest solution to my problem?
Thanks & Regards
Rathinavel
