237-00156 SofTec Microsystems SRL, 237-00156 Datasheet - Page 74

• 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

6.3.2 Start-Up Settings
A successful motor start-up is a start-up that occurs 100% of the times and
in a very short time. To achieve a successful start-up, two phases are
required: the alignment phase and the acceleration phase. The start-up
method implemented in AK-ST7FMC Control Panel is only one among many
different start-up methods. For some motors it may be necessary to
implement a start-up strategy different than the one proposed in the AK-
ST7FMC Control Panel. This will require the ST7FMC firmware to be edited
directly without using the AK-ST7FMC Control Panel.
The alignment phase consist in rotating the motor in a know position and to
stabilize the rotor before starting. To achieve this, a voltage or current ramp
is supplied to the motor (increasing current or increasing duty cycle
depending on Current or Voltage mode). During the alignment phase, the
motor is polarized with a fixed step configuration T1-T4-T6 (no rotating
statoric field).
The acceleration phase is a phase during which synchronous rotation is
forced on the motor with a fixed acceleration rate in order to get BEMF
information and switch as soon as possible from Forced mode to
Autoswitched mode (for more information about Forced mode and
Autoswitched mode please refer to the ST7FMC microcontroller datasheet).
Parameter Name
Closed Loop
Parameter Values/Description
Proportional Integral regulation is available (this
is done by software in the MCU). The user sets a
desired speed: based on the PI values for this
speed, the MCU defines a duty cycle (voltage
mode) or a current reference (current mode).
Closed Loop mode is used to implement a fine
speed response and regulation.
AK-ST7FMC User's Manual
Page 73
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