Honeywell UMC800 - 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.