Honeywell 900U02-0100 - Page 205

Revision 10 ControlEdge HC900 Process & Safety Controller User and Installation Manual 191
May 2019
Number
of Red
Strobes
Possible Causes
Lead and/or Reserve
Controller Action(s)
User Action
Honeywell OI
Indication
HCDesigner/HC
Utilities
Indication
3
One of the
exception vectors
located in RAM
became corrupted.
The exception vector was
automatically corrected in the
controller’s RAM and the
controller continues to operate
normally.
This diagnostic will cause the
HWOK pins of the AYSY and
FSYS blocks to be turned off.
4
Estimated battery
life is less than 5
days.
 ASYS and FSYS blocks’
HW OK pins are turned off.
 Firmware upgrade is still
permitted.
Replace battery.
If the lead’s
status LED is
indicating the
failure, see
MEMORY in
the “Lead CPU
Diagnostics”
display.
If the reserve’s
status LED is
indicating the
failure, see
MEMORY in
the “Reserve
CPU
Diagnostics”
display.
If the lead’s
status LED is
indicating the
failure, see
Memory
Diagnostics in
the “Lead
Diagnostics
Overview”
dialog box.
If the reserve’s
status LED is
indicating the
failure, see
Memory
Diagnostics in
the “Reserve
Diagnostics
Overview”
dialog box.
4
Battery voltage is
low.
 ASYS and FSYS blocks’
LOWBTRY pins are turned
on.
 ASYS and FSYS blocks’
HW OK pins are turned off.
 Firmware upgrade is
inhibited until both the Lead
and Reserve batteries are
good.
Replace battery.
4
Flash failed to burn
ASYS and FSYS blocks’ HW
OK pins are turned off.
1. Force a cold start
2. If diagnostic does not clear,
replace CPU module.