Honeywell UMC800 - Specifications; Introduction; Controller Design

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.