Honeywell UMC800 User Manual
Page 92
Diagnostics and Troubleshooting
Fault Detection and Troubleclearing
84
UMC800 Controller Installation and User Guide
Release F
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
CPU
SPURIOUS
INTERRUPT
POWER
LED flashes
4 times.
Spurious Interrupt.
Executes normally.
1.
Force a cold
start. (Toggle
controller mode
switch from
PGM to RUN.)
2.
Isolate system
from noise and
force a cold
start.
3.
Replace CPU
board.
MEMORY
GOOD
−
−
−
none
MEMORY
LOW BATTERY
Lo BATT
LED on.
Battery voltage is
low.
Executes normally.
Replace battery.
MEMORY
FLASH ERROR
POWER
LED flashes
5 times.
Flash PROM failed
to burn.
Executes normally.
1.
Force a cold
start. (Toggle
controller mode
switch from
PGM to RUN.)
2.
If fault
reappears,
replace CPU
board.
GOOD
−
−
−
none
RTC
(Real
Time
Clock)
NOT
PROGRAMMED
POWER
LED flashes
6 times.
RTC not
programmed
Time and date is
set to 00:00:00,
January 1, 1970.
Enter correct time
and date.
RTC
BAD DATA
POWER
LED flashes
7 times.
Bad time and date.
Time and date is to
00:00:00, January
1, 1970.
1.
Program RTC.
2.
Cycle power.
3.
Replace CPU.
4.
Replace
boards in
backplane.
5.
Replace
backplane.