Honeywell UMC800 User Manual
Page 93
Diagnostics and Troubleshooting
Fault Detection and Troubleclearing
Release F
UMC800 Controller Installation and User Guide
85
4/01
Controller
Diagnostic Summary
(In the User Utility and Operator
Interface)
Controller
LED on CPU
Fault Detection / Troubleclearing
Menu
Item
Status
Possible Cause
Controller Action
User Action
RTC
BATTERY
FAILURE
POWER
LED flashes
8 times
RTC battery failed
on power-up
Time and date is
set to 00:00:00,
January 1, 1970.
1.
If Lo BAT LED
is off, cycle
power.
2.
If Lo BAT LED
is on, replace
battery and
cycle power.
RTC
PROGRAMMING
FAILURE
POWER
LED flashes
7 times
RTC failed to
program
Time and date is
set to 00:00:00,
January 1, 1970.
1.
Program RTC.
2.
Cycle power.
3.
Replace CPU.
4.
Replace
boards in
backplane.
5.
Replace
backplane.
RTC
READ FAILURE
POWER
LED flashes
7 times
Unable to read
RTC
Time and date is
set to 00:00:00,
January 1, 1970.
1.
Program RTC.
2.
Cycle power.
3.
Replace CPU.
4.
Replace
boards in
backplane.
5.
Replace
backplane.
I/O
GOOD
−
−
−
none
I/O
MODULE
ERROR
N/A
One of the I/O
board diagnostics
failed.
N/A
Access the I/O
MODULE
DIAGNOSTICS
display.
I/O
BAD BACKPAN
POWER
LED flashes
9 times.
Bad backplane
EEPROM
Analog inputs use
default coefficients.
1.
Cycle power.
2.
Replace
backplane
board.
I/O
BAD BACKPAN
ID
POWER
LED flashes
9 times.
Incompatible
backplane board
Analog inputs use
default coefficients.
1.
Cycle power.
2.
Replace
backplane
board.