237-00156 SofTec Microsystems SRL, 237-00156 Datasheet - Page 81

• Manufacturer Part Number: 237-00156
• Description: BOARD ISOLATION FOR ST7
• Manufacturer: SofTec Microsystems SRL
• Type: Optoisolation Boardr

Specifications of 237-00156

• Contents: *
• For Use With/related Products: STMicro ST7FMC Motor Control Device
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

6
AK-ST7FMC Control Panel Features
Page 80
Parameter Name
PWM Distribution
Speed Range
Minimum
Mechanical
Speed
Maximum
Mechanical
Speed
Current Loop
Current Blanking
Window
Current Event
Counter Filter
Sets PWM signal distribution between the switches’ high side and low
side (respectively even and odd) after each C, D and Z event. Double
click to toggle from 0 to 1 and vice versa.
For each step it is possible to select on which active switch the PWM
signal is applied after the 3 different events (C, D and Z). This is useful
to accelerate demagnetization and to reduce the level of reactive
current inside the winding.
Example: on step T1-T4, T1 is the high side (even) and T4 is the low
side (odd). Setting the corresponding “After C” value to 1 causes the
PWM signal to be applied on the odd switch (T4) from the C event until
the D event; setting the “After D” value to 0 causes the PWM signal to
be applied on the even switch (T1) from the D event until the Z event;
setting the “After Z” value to 1 causes the PWM signal to be applied on
the odd switch (T4) from the Z event until the next C event.
MCRB register, 3 bits from OS2 to OS0.
Available in Closed Loop only. Speed below which you do not want the
motor to run. This can be useful in Sensorless mode, to avoid going
below a speed that doesn't allow to generate enough BEMF.
This value can be set in Hz or RPM (click the “Hz” or “RPM” button
next to the edit box to switch between units).
This is a safety value.
Example: for a motor with a specification of 20,000 RPM absolute
maximum, set the same value; if this speed is exceeded, the rotor may
be explode or ball bearings may get damaged, and in turn this may
cause major injuries (the rotor may be blocked instantaneously,
causing the whole motor chassis to turn as a reaction). Always fix
securely the motor on a mechanical bench.
This value can be set in Hz or RPM (click the “Hz” or “RPM” button
next to the edit box to switch between units).
Used to prevent the Current Loop from stopping on a current spike
after PWM ON. This spike is usually caused by the recovery current
from the half-bridge free wheeling diode and can be further increased
by the discharge of the motor winding stray capacitance. The blanking
window starts after each PWM ON event and during this blanking
window no reading of current is done. This blanking window can also
be disabled.
MCFR register, 3 bits from CFW2 to CFW0.
Number of consecutive current comparator samples (at 1 MHz)
required to switch the PWM signal to OFF.
MCFR register, 3 bits from CFF2 to CFF0.
Parameter Values/Description