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Redundant Overview Diagnostics
Revision 9 900 Control Station User Guide 53
May 2014
Item Status Possible Cause Controller Action Fix
REDUNDANT P/S IS
NOT PRESENT
Single Power Supply
configuration
Redundant Power
Backplane not
detected
Rack continues to
function properly
No action required if single
power supply rack
If dual power supply is
installed:
Replace Redundant
Power Backplane
Replace rack backplane
Replace Scanner2
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.
BOTH POWER
SUPPLIES ARE
GOOD
N/A None None
LEAD CPU
POSITION
CPU-A
CPU-A is currently the
lead
N/A N/A
CPU-B
CPU-B is currently the
lead
N/A N/A
CPU IS MISSING
Reserve CPU is not
installed or not
powered.
CPU rack backplane
failure
The lead controller
will continue to
control the process,
but failover is not
possible.
Install reserve CPU
Apply power to reserve CPU
Replace CPU rack backplane
Contact Honeywell Service.
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