Motor Protection Logic
Technical Summary
2-15
2.14.1 UNI-3 Motor Protection Logic
The UNI-3 DC Bus Over-Voltage signal is connected to the DSP’s PWM group’s fault
input, FAULT0. The UNI-3 DC Bus Over-Current signal is connected to the DSP’s PWM
group’s fault input, FAULT1. Additionally, the UNI-3 DC Bus Over-Voltage and
Over-Current analog signals are connected to two DSP A/D inputs, AN0 and AN1,
respectively.
contains the diagram of the DC Bus Over-Voltage and DC Bus
Over-Current circuit for the UNI-3 interface.
Figure 2-11. DC Bus Over-Voltage and Over-Current Detection Schematic
Diagram
+5.0V
+3.3V
I_sense_DCB
FAULT1
LM393
DC BUS CURRENT SENSE
+
–
+5.0V
+5.0V
+3.3V
V_sense_DCB
FAULT0
LM393
DC BUS VOLTAGE SENSE
+
–
+5.0V
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