Honeywell UMC800 - 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.