Other Parts Discussed in Thread: TMDSHVMTRINSPIN, MOTORWARE
Hello,
We have a TMDSHVMTRINSPIN development kit which was purchased a few years ago.
I am now trying to run our 3-HP ACIM by using the hvdev kit.
The electrical specification of our 3-HP ACIM is 8.7A for 220VAC.
Therefore the peak value of rated current may be 8.7A * 1.414 = 12.3A.
In view of this fact, I made a modification to the electrical circuit of the hvdev kit by decreasing the resistance of the phase current measurement resistors of R10, R11, R39 from 20mohm to 10 mohm by mounting two resistors of 20mohm in parallel for each phase.
And accordingly I have made modifications on user parameters in the file of user.h as follows:
#define USER_IQ_FULL_SCALE_CURRENT_A (20.0) // 20.0 Example for hvkit_rev1p1 along with a 3-hp motor (Rshunt=0.01 Ohm)
#define USER_ADC_FULL_SCALE_CURRENT_A (39.78) // 39.78 hvkit_rev1p1 current scaling along with 3-hp motor (Rshunt=0.01 Ohm)
In other words USER_IQ_FULL_SCALE_CURRENT_A and USER_ADC_FULL_SCALE_CURRENT_A have been doubled because the resistsnce of R10, R11, R39 have been halved from 20mohm to 10 mohm.
Then I have tried Lab Project 1c to run our 3-HP ACIM. However unfortunately our 3-HP ACIM does not rotate at all when proj1c is activated.
Before I made a modification to the resistsnce of R10, R11, R39 on the hvdev kit and with the original user parameters, our 3-HP ACIM ran well when I tried Proj1c.
Presently I can not figure out how I made a mistake in the modification.
Do I need to modify some more motorware source codes in addition to user.h when the resistsnce of R10, R11, R39 have been halved from 20mohm to 10 mohm?
Thank you for your guidance.
With regards,
G. Kim
