Specifications

Theory of Operation
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Sensor Power and Actuator Power Distribution on the Island Bus
Summary The sensor bus and the actuator bus need to be powered separately from external
sources. Depending on your application, you may want to use the same or different
external power supplies to feed the sensor bus and the actuator bus. The source
power is fed to two two-pin power connectors on a PDM.
z The top connector is for the sensor power bus
z The bottom two-pin connector is for the actuator power bus
24 VDC
Field Power
Distribution
An external power supply delivers field power distributed to an STB PDT 3100 PDM.
IMPROPER GALVANIC ISOLATION
The power components are not galvanically isolated. They are intended for use
only in systems designed to provide SELV isolation between the supply inputs or
outputs and the load devices or system power bus. You must use SELV-rated
supplies to provide 24 VDC source power to the NIM.
Failure to follow these instructions can result in injury or equipment damage.
COMPROMISED DOUBLE INSULATION
Above 130 VAC, the relay module may compromise the double insulation provided
by a SELV-rated power supply.
When you use a relay module, use separate external 24 VDC power supplies for
the PDM supporting that module and the logic power to the NIM or BOS module
when the contact voltage is above 130 VAC.
Failure to follow these instructions can result in injury or equipment damage.
CAUTION
CAUTION
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