TROUBLESHOOTING
FUNCTION CODE 55 PROBLEM REPORTS
I-E96-322A
6 - 5
or three. Nonfatal errors indicate that the module has discov-
ered an error but will continue to function. Nonfatal errors
generate module problem reports having error types nine and
12.
Table 6-2. Function Code 55 Module Problem Report
Error Type
Module Error
Corrective Action
1 - No response/
wrong type
Any I/O expander bus communication failure.
Any command or data checksum failure. Error
will also be indicated by FC 55 output N+9.
Check I/O expander bus dipshunts,
remove IMHSS03 and reinsert. If error
recurs, replace IMHSS03.
Hardware or D/A error. Error will also be indi-
cated by FC 55 output N+8 or N+6,
respectively.
1. Remove IMHSS03. Insert the module.
If the error recurs, replace the module.
2. Cause may be isolated by running
diagnostics.
2 - Calibration
error
A hardware error occurred during calibration
or demodulator automatic tuning. Error may
also be indicated by FC 55 output N+6. Errors
that can cause calibration or automatic tuning
to fail are:
A/D error (indicated by output N+6).
D/A error (indicated by output N+6).
Replace IMHSS03.
An LVDT error occurred during calibration or
demodulator automatic tuning. Error may also
be indicated by FC 55 output N+7.
1. Refer to FC 55 output N+7 to isolate
error.
2. Check LVDT connections. If error
persists, replace indicated LVDT or
IMHSS03.
An error occurred during demodulator auto-
matic tuning. Errors that can cause automatic
tuning to fail are:
Minimum demodulator gain produced out of
range 100% or 0% LVDT values.
Maximum demodulator gain produced LVDT
spans that are too small.
1. Refer to the value selected by the mod-
ule in S16 to isolate the error.
2. Adjust the oscillator voltage amplitude,
selected with SW5, based on value
returned in S16. Retry procedure. If error
persists, replace IMHSS03.
An error occurred during calibration. Errors
that can cause calibration to fail are:
100% LVDT value < 0% LVDT value.
Servo outputs not saturated at 100% or 0%
position.
1. Refer to the values returned by the
IMHSS03 in S18 through S21 to isolate
the problem.
2. Increase controller gain or decrease
demodulator gain.
3. Retry procedure, if error persists,
replace IMHSS03.
3 - Channel
failure/out of
range
Any fatal LVDT failure in servo mode:
Only using LVDT 1 (S3=0), and any LVDT 1
error.
Only using LVDT 2 (S3=1), and any LVDT 2
error.
Redundant LVDTs (S3=2 or 3), and LVDT 1
and LVDT 2 errors.
1. Refer to FC 55 output N+7 to isolate
error.
2. Check LVDT connections. If error
persists, replace indicated LVDT or
IMHSS03.
