Motorola M68HC08 - Manual (Page 138)

User Guide
Designer Reference Manual DRM028 — Rev 0
138 User Guide MOTOROLA
VOLT_MIN_FAULT_V determines the minimal voltage when the
drive fault state should be entered. So the constants
VOLT_MIN_FAULT_V must be set according to minimal voltage
limits of the motor application. It should be changed when there are
problems with under-voltage.
Dc-bus voltage threshold mains 120V/230V [V]:
/* CAN_CHANGE_10: */
#define VOLT_120_THRESHOLD_V 150
Range: <0,VOLT_RANGE_MAX>
120 V voltage threshold setting should only be used for high-voltage
hardware. It determines if 120 or 230 V mains voltage will be detected
by software. But the VOLT_120_THRESHOLD_V detection has no
importance for the software functionality! For low-voltage hardware
the VOLT_120_THRESHOLD_V should be set to 0.
6.5.4.2 Maximal and Minimal Current Limits Setting
Most of current limits settings do not necessarily need to be done.
Current offset limit for fault during calibration (initialization) [V]:
/* CAN_CHANGE_4: */
#define OFFSET_MAX_CURR_V (1.65+0.225)
Range: <0,5>
When PWM is off, the default hardware determined offset should be 1.65
V.The actual offset is checked during current calibration. The fault offset
limit should be:
OFFSET_MAX_CURR_V = Default h/w offset
+ minimal allowed offset error (EQ 6-3.)
OFFSET_MAX_CURR_V should only be changed if there are
over-current problems during current offset calibration (at MCU
initialization).
Maximal limit of dc-bus current [A]:
/* CAN_CHANGE_3: */
#define CURR_MAX_FAULT_A 1.5
Range: <0,CURRENT_RANGE_MAX_A>
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Freescale Semiconductor, Inc.
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