Secondary Uni-3 Motor Protection Logic; Dc-Bus Over-Voltage And Phase Over-Current Detection Circuits - Motorola Digital DNA DSP56F807 Hardware User Manual

2.16.2 Secondary UNI-3 Motor Protection Logic

The Secondary UNI-3 interface is similar to the Primary UNI-3 interface. The Secondary
UNI-3 Over-Voltage signal is connected to the DSP's PWM group B's fault input,
FAULTB1. The three Secondary UNI-3 Phase Over-Current signals are connected to the
DSP's PWM group B fault inputs, i.e., FAULTB1, FAULTB2 and FAULTB3. The
Secondary UNI-3 interface is similar to the circuits contained in
FAULTB1 input can be sourced from the Phase A Over-Current circuit or the DC Bus
Over-Current circuit. Jumper JG16, provides the selection; reference
Table 2-10.
DC BUS VOLTAGE SENSE
V_sense_DCB
EXAMPLE DC PHASE CURRENT SENSE
PHB_IS
Figure 2-13. DC-Bus Over-Voltage and Phase Over-Current Detection Circuits
+5.0V
+5.0V
Technical Summary
Motor Protection Logic
Figure 2-13. The
Figure 2-14
+3.3V
+5.0V
+
–
LM393
+3.3V
+5.0V
+
–
LM393
and
FAULT0
FAULT2
2-21