The Principles Of Plus + Wiring - Siemens ST950 Plus+ User Manual

ST950 Plus+ User Manual
2.1.4 Smartloop Modules
The Smartloop unit is a combination of a node and an SLD4.
The combination of these devices, developed as a single PCB, is housed in a plastic enclosure and
then fully potted. The Smartloop device can then be connected to the Plus+ network and provide
an interface for inductive traffic detection loops. This implementation continues the principle of
minimising the amount of street cables routed back to the controller.
The Smartloop provides:
•
Connections for up to four inductive loops.
•
Permanently active LED indicator of detection state
•
Connections to allow further Smartloops to be connected downstream.
•
Bluetooth interface for configuration.
Note that:
•
Both loops of an SDE/SA or U/D pair must be assigned to the same Smartloop device.
•
N+1 count inputs are not currently supported by Smartloop and must continue to use
standard loop detector cards (e.g. SLD4).
The Principles of Plus
2.2.1 Voltage Drop in Plus+ Network
The IET regulations have defined values for voltage drop within a network to ensure that any
equipment connected to that network is maintained within its likely operating range. Within a
traffic control signals network the rule of thumb of 4% does not necessarily apply directly, as
signals have their own operating range and requirements. The applicable design and maintenance
limits are defined in our design and equipment handbooks for our signals, (Note signals supplied
by third parties may have different operating characteristics and ranges and the design and
maintenance limits for those should be obtained from the OEM).
For Plus+ the complex design calculations have been built into our Plus+ junction layout design
tool. The equipment will then inform users / maintainers if the supply as seen at any pole / node
is outside to the normal operating range for a period.
2.2.2 Wiring
The Plus system elements are wired up by a collection of 4-way street cables (armoured) and 6-
+
way (dropper) cables. The diagram below outlines the principles behind the wiring particularly
with regards to cable types and colours.
ST950 Plus+ User Manual
Wiring
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