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ST950 Plus+ User Manual
ST950 Plus+ User Manual
Page 35 of 176
667/HE/53000/000
Issue 2
Unrestricted
The incoming 48V DC PSUs connect to the Input terminal block. The outgoing connections to the
CIC/CTB, made via spade terminals, connect to the +48V OUT and 0V OUT terminals. At the CTB
the orange wires are connected to the PWR BNK1 IN, PWR BNK2 IN and PWR BNK3 IN terminals.
The Black wires are connected to the GND terminals.
The Monitor connection connects to PL3 of the CTB and provides status to the CIC indicating
whether the connected PSUs are Present, Imbalanced or Overloaded.
3.7.3
Configuration
The Redundancy module provides no user configurable options or controls.
3.7.4
Fault Indication
LEDs on the module indicate the health of the connected PSUs.
Led Indicator
Function
Meaning
Green x 3
Presence
On
Energised PSU is
connected.
Yellow 1
Imbalance LED
On
9
Voltage Imbalance
between PSU 1 and 2
Yellow 2
Imbalance LED
On
10
Voltage Imbalance
between PSU 2 and 3
Red x 3
Overload
On
Too much current is
being drawn from a PSU
11
Table 3
–
I/O Card LEDs
PSUs are factory adjusted and should not give a voltage imbalance. If it occurs, solving an
Imbalance issue involves the careful adjustment of the connected PSUs. Please contact Siemens
Engineering in Poole for assistance before attempting any adjustment.
Should an Overload LED become illuminated the likely causes are incorrect street wiring from the
CTB or a badly installed traffic system i.e. too many nodes connected to a particular power source.
As well as the LED indication the controller will also record the above faults in the fault table.
3.7.5
Parts
Redundancy Module 667/1/53185/000
9
Solving an Imbalance issue involves the careful adjustment of the connected PSUs. Please
contact Siemens Engineering in Poole for assistance before attempting any adjustment.
10
Flickering - lightly loaded systems may show one or more flickering Imbalance LEDs this is not
a fault.
11
A severe voltage imbalance could lead to an overload on one PSU. An overload indication
provides early warning of a possible PSU shutdown: the PSU will self-protect if the overload
becomes significant.