Rockwell Automation SA500 Diagnostics, Troubleshooting Guide - Manual (Page 13)

Diagnostics and Troubleshooting 2-3
2.2 Power-up Diagnostics in the UDC Module and PMI
Power-up diagnostics execute in the UDC module in the AutoMax™ rack and in the
PMI in the Power Module. When power is applied to the AutoMax rack, the UDC
module performs a series of self-tests. When all of the tests are successfully
completed, the CARD OK LED on the UDC module's faceplate will turn on. If a failure
occurs, the OS OK LED will flash rapidly.
When power is applied to the Power Module, the PMI performs a series of self-tests.
When all of the tests are successfully completed, the OK LED on the Power Module’s
faceplate will turn on. If a failure occurs, the P.M. FLT LED on the Power Module will
flash rapidly.
If a UDC module or a Power Module does not pass its power-up tests, it must be
replaced. After all of the power-up tests are passed, the system continues its
power-up routine. The PMI requests the appropriate operating system from the UDC
module. The UDC module downloads the operating system and the parameter
configuration data, if available, to the PMI. The PMI then runs under the control of its
operating system and begins performing the run-time diagnostics. Run-time
diagnostics are described in section 2.4.
2.3 Interlock Tests
Interlock tests are performed by the PMI whenever one of the PMI's operating modes
is selected by the programmer through the Drive Control register (100/1100). These
diagnostics verify that all conditions required for the operating mode selected are
satisfied. If the interlock tests are completed successfully, then the operating mode
requested by the programmer can be entered. If any of the interlock diagnostics fails,
the PMI will latch a bit in the Interlock register (205/1205) corresponding to the first
diagnostic test that failed, and the requested operating mode will not be entered (i.e.,
the PMI will remain in the idle mode).
If an interlock test failure occurs, follow the procedure below:
Step 1. Reset the command bit that is currently set in the Drive Control register
(100/1100).
Step 2. Correct the condition that caused the test failure.
Step 3. Set the desired command bit in the Drive Control register (100/1100).
The PMI will perform the interlock tests each time a rising edge is detected on the
command bits. The results of subsequent interlock tests will overwrite the previous
test’s results.
2.4 Run-time Diagnostics
Run-time diagnostics are performed continuously by the PMI after its operating
system has been downloaded by the UDC module. These diagnostics test the status
of the PMI and the connected hardware and also check the integrity of the
communication link between the UDC module and the PMI.