237-00156 SofTec Microsystems SRL, 237-00156 Datasheet - Page 93

• 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 92
Parameter Name
Switches PWM
Frequency
Minimum Stator
Frequency
Maximum Stator
Frequency
Dead Times
Value
Stop Condition
Brake Level
Brake Time
Table 6.10: AK-ST7FMC Control Panel: AC Motor Advanced Settings
Inverter switches (IGBT/MOSFET) PMW output frequency.
In the firmware, the 12-bit timer frequency is set to the desired PWM
frequency (MCPOL, MCPOH and MPCR registers). The output
polarity (MPOL register, 6 bits from OP5 to OP0) of the six PWM
outputs is fixed for the STMicroelectronics drivers and cannot be
changed. For sources using the opposite polarity, please contact
STMicroelectronics.
Speed below which you do not want the motor to run.
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).
Sets the deadtime between the switches’ high and low side to avoid
cross conduction. The inverter of the Motor Control board requires a
minimum deadtime of 0.625 µs to avoid cross conduction problems.
Values from 0.625 µs to 16 µs are available in the AK-ST7FMC
Control Panel. However, values as low as 0.125 µs can be set when
editing ST7FMC registers directly. This allows the deadtime to be
modified in case an external inverter power stage is connected to the
board.
MDTG write-once register, 6 bits from DTG5 to DTG0.
Free Wheeling
DC Current
Braking
Available when the “DC Current Braking” option above is selected.
Two of the three bridge legs are grounded and a complementary PWM
with maximum 50% duty cycle is applied on the switches of the third
leg.
Duty cycle loaded in the MCPUH and MCPUL registers.
Available when the “DC Current Braking” option above is selected.
Time during which active braking is applied and after which the motor
is free wheeling.
Parameter Values/Description
After stop, the motor will continue to spin freely.
To slow down the motor quickly, this feature
allows to apply active braking.