STEVAL-IHM015V1 STMicroelectronics, STEVAL-IHM015V1 Datasheet - Page 37

• Manufacturer Part Number: STEVAL-IHM015V1
• Description: BOARD EVAL ST7FMC2S4T6/STS8DNH3L
• Manufacturer: STMicroelectronics
• Type: Motor / Motion Controllers & Driversr

Specifications of STEVAL-IHM015V1

• Main Purpose: Power Management, Motor Control
• Embedded: Yes, MCU, 8-Bit
• Utilized Ic / Part: ST7FMC2S4, STS8DNH3LL
• Primary Attributes: 3-Ph BLAC, BLDC, PMAC or PMDC Motors
• Secondary Attributes: Graphical User Interface
• Input Voltage: 5 V to 48 V
• Product: Power Management Modules
• Silicon Manufacturer: ST Micro
• Core Architecture: ARM
• Core Sub-architecture: ARM7TDMI
• Silicon Core Number: ST7
• Silicon Family Name: ST7MCx
• Kit Contents: Board
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With/related Products: ST7MC2S4, STS8DNH3LL
• Other names: 497-8213

UM0432
7.4.16
Changing the maximum allowed current level
An over-current protection mechanism is included inside the board to protect the system,
disabling all the power switches if the current that flows inside the motor is greater than a
given threshold. If this occurs, the red LED starts blinking. This mechanism is called
hardware current protection.
This threshold value is fixed by the hardware to 7.65 A. To change this threshold to I
R77 resistor must be modified as per
threshold).
Equation 1
When the BLDC (trapezoidal) driving strategy is used, there is another current protection
mechanism called software current limitation, which regulates the current that flows inside
the motor. In current mode, the current is regulated to a certain value, and in voltage mode
the current is limited to a maximum value.
The maximum current allowed by this mechanism is related to the hardware and is fixed at
6.5 A. To change this threshold, the R20 resistor must be modified as described below.
First, the amplification factor called AMP must be calculated using
factor).
Equation 2
Then, the value of R
current).
Equation 3
After this modification, the "gui.ini" file must be modified. This file is inside the same folder
as the "LVST7MC - GUI" file.
Open the "gui.ini" file using the notepad tool and change the values of the following lines:
MAX_CURRENT = 8
…
AMP_SENS = 11
Replace the value 8 with I
Equation
Remember to close and re-open the "LVST7MC - GUI" file to activate this modification and
follow the instructions in
2.
20
can be calculated using
Section
MAX
expressed in amps and 11 with the AMP value calculated by
7.4.2.
R
R
77
20
AMP
Equation 1
=
=
-------------------------------------------- -
(
AMP 1
----------------------------- - 1
0.07 I
=
----------------------------- -
0.07 I
•
5
10K
Equation 3
–
MAX
•
(changing the hardware current protection
5
) 10K
MAX
•
–
(changing the maximum allowed
Motor control operations
Equation 2
(amplification
MAX
37/53
, the