Rockwell Automation SA3100 Diag,Troublesht,Startup,Guide - Manual (Page 28)

3-6 Diagnostics, Troubleshooting, and Start-Up Guidelines
Step 7. Test the bridge by measuring the voltage across the power devices. The
bridge test must be enabled and the appropriate value written to the Bridge
Test Code register (105/1105) as described below.
The value in the Bridge Test Code register specifies which power device
pairs to turn on. The value corresponds to a bit pattern, with the bits
described as follows:
• Bit 0: Phase U Upper Power Device
• Bit 1:Phase V Upper Power Device
• Bit 2:Phase W Upper Power Device
• Bit 3:Phase U Lower Power Device
• Bit 4:Phase V Lower Power Device
• Bit 5:Phase W Lower Power Device
a. Connect the voltmeter to the output terminals U, V, W for the power
devices being tested in accordance with table 3.2.
b. Turn on power to the drive.
c. Clear the Bridge Test Code register (105/1105, TST_CODE%).
Figure 3.3 – Power Device Test Locations
Left Middle Right
U
V
W
Upper
Lower
DC
Bus
+
–
Gate
Driver Gate
Driver Gate
Driver