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18 HD65 & HD130 STEPPER DRIVES USER GUIDE
0V
Fault
PROTECTION CIRCUIT
Output
Fault
Latch
Thermal
Sensor
Over-
load
Comp.
Phase 1
Current
Phase 2
Current
Over-
volts
Comp.
-H.T.
-5V
+5V
+12V
+24V
Over-
temp
Over-
load
Supply
Fault
Zero
Phase
Zero Phase
Output
Figure 7. Simplified Protection Circuit