Motorola M68HC08 manual Voltage Setting Hardware Customizing, Current Setting Hardware Customizing

Freescale Semiconductor, Inc.

Freescale Semiconductor, Inc.

User Guide

Tuning for Customer Motor

/* MUST_IF_HW_CHANGE_1: */ #define DUTY_PWM_MAX 0.96

Range: <0,1>

Proportional value of maximal PWM duty cycle is determined by power stage boards used.

DUTY_PWM_MAX must be set for any hardware customizing. Some hardware boards need maximal duty cycle<1, in order to charge high side drivers for power inverters.

6.5.3.3 Voltage Setting Hardware Customizing

Maximal measurable voltage determined by hardware voltage sensing [V]:

/* MUST_IF_HW_CHANGE_2: */

#define VOLT_HW_MAX 407.0

Range: <0,infinity)

VOLT_HW_MAX must be changed when voltage sensing range is different from default hardware.

Maximum limit of dc-bus voltage allowable for the hardware [V]:

/* MUST_IF_HW_CHANGE_3 */ #define VOLT_MAX_FAULT_V 380.0

Range: <0,VOLT_RANGE_MAX>

VOLT_MAX_FAULT_V determines the maximal voltage when the drive fault state should be entered. So the constant VOLT_MAX_FAULT_V must be set according to maximal voltage limit of the power stage or the motor, using the lower value. Therefore, setting this constant is also mentioned in Maximal and Minimal Voltage Limits Setting under a different label (CAN_CHANGE_1).

6.5.3.4 Current Setting Hardware Customizing

Maximal measurable current determined by hardware current sensing [A]:

/* MUST_IF_HW_CHANGE_4: */ #define CURR_HW_MAX_A 2.93

Range: <0,infinity)

DRM028 — Rev 0		Designer Reference Manual
MOTOROLA	User Guide	135
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