Rockwell Automation 57C411 Resolver Input Module - Manual (Page 31)

5Ć1
5.0 DIAGNOSTICS AND
TROUBLESHOOTING
This section explains how to troubleshoot the module and field
connections.
5.1 Incorrect Data
Problem: The data is either always off, always on, or different than
expected. The possible causes of this error are a module in the
wrong slot, a programming error, or a malfunctioning module. It is
also possible that the input is either not wired or wired to the wrong
device. Use the following procedure to isolate the problem:
Step 1.
Verify that the input module is in the correct slot and that
the I/O definitions are correct.
Refer to figure 3.1. Verify that the slot number being
referenced agrees with the slot number defined in the
configuration task. Verify that the register number and the
bit number are correct.
For remote I/O installations, also verify that the master slot
and drop numbers are defined correctly. Refer to the DCS
5000 Remote I/O Instruction Manual (JĆ3629) for more
detailed information on configuring your remote I/O
system.
Step 2. Verify that the module can be accessed.
Connect the programming terminal to the system and run
the ReSource Software. Use the I/O MONITOR function to
display the four registers on the input module. Repeat
steps 7 and 8 in section 3.2.
Step 3. Verify that the user application program is correct.
Review the programming examples in sections 4.4, 4.5,
and 4.6. Make certain that the I/O definitions in your
configuration task are correct and that the task(s) using
this module have declared these variables COMMON.
Verify that an update period has been written to register 4.
Recall that each count is 500 microseconds (.0005
seconds). This value specifies the frequency with which
the resolver position will be converted to digital numbers.
Verify that the common clock has been turned on. The
CCLK OK" LED on the faceplate of the module should be
lit. If the common clock is not present on the backplane,
the module will not convert the resolver position to digital
values. If the common clock is being generated from this
module, remember that bit 6 in register 3 must be set.
Step 4. Verify that the resolver is wired correctly.
Remove power from the system. Disconnect the
mechanical coupling between the resolver and the motor.
Confirm that all the terminal strip connections are tight.
Refer to figures 3.2 and 3.3. Appendix C also lists the
terminal strip connections.
Apply power to the rack only.