Honeywell UMC800 Installation And User Manual page 92

Diagnostics and Troubleshooting
Fault Detection and Troubleclearing
Controller
Diagnostic Summary
(In the User Utility and Operator
Interface)
Menu Status
Item
CPU SPURIOUS
INTERRUPT
MEMORY GOOD
MEMORY LOW BATTERY
MEMORY FLASH ERROR
RTC GOOD
(Real
NOT
Time
PROGRAMMED
Clock)
RTC BAD DATA
84
Controller
LED on CPU
Possible Cause
POWER Spurious Interrupt.
LED flashes
4 times.
Lo BATT Battery voltage is
LED on. low.
POWER Flash PROM failed
LED flashes
to burn.
5 times.
POWER RTC not
LED flashes programmed
6 times.
POWER Bad time and date.
LED flashes
7 times.
UMC800 Controller Installation and User Guide
Fault Detection / Troubleclearing
Controller Action
Executes normally.
Executes normally.
Executes normally.
Time and date is
set to 00:00:00,
January 1, 1970.
Time and date is to
00:00:00, January
1, 1970.
User Action
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.
none
Replace battery.
1. Force a cold
start. (Toggle
controller mode
switch from
PGM to RUN.)
2.
If fault
reappears,
replace CPU
board.
none
Enter correct time
and date.
1.
Program RTC.
2.
Cycle power.
3. Replace CPU.
4. Replace
boards in
backplane.
5. Replace
backplane.
Release F
4/01