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Diagnostics Redundant Overview
52 900 Control Station User Guide Revision 9
May 2014
Item Status Possible Cause Controller Action Fix
FLASH ERROR Flash failed to burn
1. Associated rack
monitor block’s
RACK OK pin is
turned off.
2. SYSTEM
MONITOR
block’s HW OK
pin is turned off.
1. Force a cold start.
2. Replace CPU board.
POWER
SUPPLY DIAG
GOOD N/A N/A N/A
POWER SUPPLY
PS-1 FAILED
A scanner has
redundant power
supplies installed and
the one identified as
PS-1 is not working
Failed Power Supply
Failed Redundant
Power Backplane
detection circuit
Failed Rack backplane
status signal
Failed Scanner2 status
input
I/O rack continues to
function normally
using the remaining
power supply
Verify that the power supply is
connected to a power source
Replace power supply
Requires unit shutdown – replace
redundant power backplane
Requires unit shutdown – replace
rack backplane.
Requires unit shutdown – replace
Scanner2.
Contact Honeywell Service.
POWER SUPPLY
PS-2 FAILED
A scanner has
redundant power
supplies installed and
the one identified as
PS-2 is not working
Failed Power Supply
Failed Redundant
Power Backplane
detection circuit
Failed Rack backplane
status signal
Failed Scanner2 status
input
I/O rack continues to
function normally
using the remaining
power supply
Verify that the power supply is
connected to a power source
Replace power supply
Requires unit shutdown – replace
redundant power backplane
Requires unit shutdown – replace
rack backplane.
Requires unit shutdown – replace
Scanner2.
Contact Honeywell Service.
POWER
SUPPLY
STATUS
UNKNOWN
No Rack
communication
If under power, I/O
will switch to failsafe
values
Loss of Comms
If not powered (un-
powered outputs)
Loss of AC mains
Bad Power Supply
Failed Scanner2
Determine and correct cause of
communication failure.
Determine and correct cause of
communication failure.
Restore rack operation
Restore AC mains power, reset
breaker
Replace Power Supply
Replace Scanner2
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