Rockwell Automation SA3100 Diag,Troublesht,Startup,Guide - Manual (Page 29)

PMI Regulator Operating Modes 3-7
d. Enable the internal DC bus by setting the Bus Enable bit (bit 4 in register
100/1100, BUS_ENA@ ). A complete description of the DC bus
pre-charge sequence can be found in the SA3100 Power Modules
instruction manual, S-3058.
e. The drive must pass all the interlock tests and the run permissive input
(RPI) must be on. In addition, if it is configured during parameter entry, the
MCR output must be turned on by the PMI Regulator to close the
M-contactor.
f. Set the Bridge Test Enable bit (bit 2 in register 100/100, BRG_TST@ ).
The bridge test will remain enabled until the bit is reset by the programmer,
a fault is detected, or the RPI input is turned off.
g. Enter the proper power device value into register 105/1105,
TST_CODE%.
Step 8. The voltmeter should read approximately nominal bus voltage for each
power device pair. After testing one pair, turn off power to the drive. Wait
five minutes to allow the DC bus voltage to dissipate. Repeat step 4. Select
another power device pair and repeat step 7. Test the third power device
pair in the same manner.
Step 9. If all the power device pairs have been tested successfully, and no faults
have occurred, the test is complete. Reset the Bridge Test Enable bit.
If testing a power device pair results in 0 or nearly 0V, both devices have
failed. In this case, replace the two power devices.
If the test results in more than 0V, but significantly less than nominal bus
voltage, one of the two devices in the pair has failed. If testing a power
device pair causes an instantaneous overcurrent fault or a bus overcurrent
fault (reported in register 202/1202) then a power device has shorted. Note
that you must set the Bridge Test Enable bit again to test any other device
pairs.
If one pair fails the test, you must test a second pair to determine which IGBT
module to replace. The second test should include one of the two devices in
the pair that failed. If this second pair fails the test, then the IGBT module
containing the device that the two pairs have in common should be replaced.
If this second pair passes the test, IGBT module containing the device that
the two pairs do not have in common should be replaced.
For example, if pair 1 in the table (U upper and V lower) fails the test, you
could test pair 3 in the table (U upper and W lower) to determine which IGBT
module should be replaced. If pair 3 fails, replace the IGBT module
switching phase U. If pair 3 passes the test, then the problem is in the IGBT
module switching phase V.
Refer to the appropriate service manual, as listed in table 1.2, for instructions
on replacing an IGBT module. After replacing the IGBT module, repeat this
entire procedure beginning at step 1.
Step 10. With the test completed, reconnect the motor to the Power Module output.
Close and secure the Power Module’s cabinet door or chassis cover.