ST950S Plus+ Installation and Commissioning Manual
equipment is functional (data comms or authentication issues) – ideally confirmed by reviewing the
controller Fault Log.
If the issue persists after removing any reported faults then consider replacing the CIC PCB.
If all the comms LEDs on the card are out, then check that the GSPI and/or the SPB comms cables are
correctly fitted.
If all lights are off, then suspect the +24V DC supply from the PSU has failed.
Check the +24V DC output from the PSU. If it is not present, remove the power plug into the CPU Card
and re-test – if it is then present, then suspect a short-circuit between the PSU and the CTB/CIC .
Remove the high-speed serial cables in the controller to isolate the short-circuit.
If there is no +24V DC available at the PSU, then check the AC mains input to the PSU. If present,
replace the PSU and re-test.
If the lights are out on only one CIC then the power supply on that card may have failed – replace the
CIC then re-test. If the issue persists then CTB may require replacing.
10.3.8. Power Bank (Redundancy Module and 48V PSU)
If the fault log indicates an issue with 48V supplies or has raised any issues with the redundancy
module, the table below is a useful guide to diagnostics.
If the Green LEDs, which are indicators for up to three PSUs, are on then the supply is functional.
Otherwise check the 48V PSUs to confirm performance.
Table 41. I/O Card LEDs
LED Indicator
Function
Meaning
Green x 3
Presence
On
Energised PSU
is connected.
Yellow 1
Imbalance LED
Voltage Imbalance be
tween PSU 1 and 2
Yellow 2
Imbalance LED
Voltage Imbalance be
tween PSU 2 and 3
Red x 3
Overload
On
Too much current is be
ing drawn from a PSU
The 48V PSUs can easily be confirmed as operational as they have a ‘DC_OK’ LED indicator.
Also see additional details in section
Power Bank (Redundancy Module and 48V PSU)
Solving an Imbalance issue involves the careful adjustment of the connected PSUs. Please contact
Yunex Traffic Engineering in Poole for assistance before attempting any adjustment.
Flickering - lightly loaded systems may show one or more flickering Imbalance LEDs this is not a fault.
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